613328c3e2
A common pattern in the codebase is reading a cgroup memory value and converting it to a uint64_t. Let's make it a helper and refactor a few places to use it so it's more concise.
3588 lines
134 KiB
C
3588 lines
134 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#include <fcntl.h>
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#include "sd-messages.h"
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#include "alloc-util.h"
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#include "blockdev-util.h"
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#include "bpf-devices.h"
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#include "bpf-firewall.h"
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#include "btrfs-util.h"
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#include "bus-error.h"
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#include "cgroup-setup.h"
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#include "cgroup-util.h"
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#include "cgroup.h"
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#include "fd-util.h"
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#include "fileio.h"
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#include "fs-util.h"
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#include "limits-util.h"
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#include "parse-util.h"
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#include "path-util.h"
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#include "process-util.h"
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#include "procfs-util.h"
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#include "special.h"
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#include "stat-util.h"
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#include "stdio-util.h"
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#include "string-table.h"
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#include "string-util.h"
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#include "virt.h"
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#define CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC ((usec_t) 100 * USEC_PER_MSEC)
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/* Returns the log level to use when cgroup attribute writes fail. When an attribute is missing or we have access
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* problems we downgrade to LOG_DEBUG. This is supposed to be nice to container managers and kernels which want to mask
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* out specific attributes from us. */
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#define LOG_LEVEL_CGROUP_WRITE(r) (IN_SET(abs(r), ENOENT, EROFS, EACCES, EPERM) ? LOG_DEBUG : LOG_WARNING)
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uint64_t tasks_max_resolve(const TasksMax *tasks_max) {
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if (tasks_max->scale == 0)
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return tasks_max->value;
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return system_tasks_max_scale(tasks_max->value, tasks_max->scale);
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}
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bool manager_owns_host_root_cgroup(Manager *m) {
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assert(m);
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/* Returns true if we are managing the root cgroup. Note that it isn't sufficient to just check whether the
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* group root path equals "/" since that will also be the case if CLONE_NEWCGROUP is in the mix. Since there's
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* appears to be no nice way to detect whether we are in a CLONE_NEWCGROUP namespace we instead just check if
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* we run in any kind of container virtualization. */
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if (MANAGER_IS_USER(m))
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return false;
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if (detect_container() > 0)
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return false;
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return empty_or_root(m->cgroup_root);
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}
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bool unit_has_host_root_cgroup(Unit *u) {
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assert(u);
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/* Returns whether this unit manages the root cgroup. This will return true if this unit is the root slice and
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* the manager manages the root cgroup. */
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if (!manager_owns_host_root_cgroup(u->manager))
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return false;
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return unit_has_name(u, SPECIAL_ROOT_SLICE);
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}
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static int set_attribute_and_warn(Unit *u, const char *controller, const char *attribute, const char *value) {
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int r;
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r = cg_set_attribute(controller, u->cgroup_path, attribute, value);
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if (r < 0)
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log_unit_full(u, LOG_LEVEL_CGROUP_WRITE(r), r, "Failed to set '%s' attribute on '%s' to '%.*s': %m",
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strna(attribute), isempty(u->cgroup_path) ? "/" : u->cgroup_path, (int) strcspn(value, NEWLINE), value);
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return r;
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}
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static void cgroup_compat_warn(void) {
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static bool cgroup_compat_warned = false;
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if (cgroup_compat_warned)
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return;
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log_warning("cgroup compatibility translation between legacy and unified hierarchy settings activated. "
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"See cgroup-compat debug messages for details.");
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cgroup_compat_warned = true;
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}
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#define log_cgroup_compat(unit, fmt, ...) do { \
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cgroup_compat_warn(); \
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log_unit_debug(unit, "cgroup-compat: " fmt, ##__VA_ARGS__); \
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} while (false)
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void cgroup_context_init(CGroupContext *c) {
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assert(c);
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/* Initialize everything to the kernel defaults. */
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*c = (CGroupContext) {
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.cpu_weight = CGROUP_WEIGHT_INVALID,
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.startup_cpu_weight = CGROUP_WEIGHT_INVALID,
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.cpu_quota_per_sec_usec = USEC_INFINITY,
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.cpu_quota_period_usec = USEC_INFINITY,
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.cpu_shares = CGROUP_CPU_SHARES_INVALID,
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.startup_cpu_shares = CGROUP_CPU_SHARES_INVALID,
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.memory_high = CGROUP_LIMIT_MAX,
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.memory_max = CGROUP_LIMIT_MAX,
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.memory_swap_max = CGROUP_LIMIT_MAX,
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.memory_limit = CGROUP_LIMIT_MAX,
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.io_weight = CGROUP_WEIGHT_INVALID,
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.startup_io_weight = CGROUP_WEIGHT_INVALID,
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.blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID,
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.startup_blockio_weight = CGROUP_BLKIO_WEIGHT_INVALID,
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.tasks_max = TASKS_MAX_UNSET,
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};
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}
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void cgroup_context_free_device_allow(CGroupContext *c, CGroupDeviceAllow *a) {
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assert(c);
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assert(a);
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LIST_REMOVE(device_allow, c->device_allow, a);
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free(a->path);
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free(a);
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}
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void cgroup_context_free_io_device_weight(CGroupContext *c, CGroupIODeviceWeight *w) {
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assert(c);
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assert(w);
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LIST_REMOVE(device_weights, c->io_device_weights, w);
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free(w->path);
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free(w);
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}
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void cgroup_context_free_io_device_latency(CGroupContext *c, CGroupIODeviceLatency *l) {
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assert(c);
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assert(l);
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LIST_REMOVE(device_latencies, c->io_device_latencies, l);
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free(l->path);
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free(l);
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}
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void cgroup_context_free_io_device_limit(CGroupContext *c, CGroupIODeviceLimit *l) {
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assert(c);
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assert(l);
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LIST_REMOVE(device_limits, c->io_device_limits, l);
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free(l->path);
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free(l);
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}
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void cgroup_context_free_blockio_device_weight(CGroupContext *c, CGroupBlockIODeviceWeight *w) {
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assert(c);
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assert(w);
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LIST_REMOVE(device_weights, c->blockio_device_weights, w);
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free(w->path);
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free(w);
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}
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void cgroup_context_free_blockio_device_bandwidth(CGroupContext *c, CGroupBlockIODeviceBandwidth *b) {
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assert(c);
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assert(b);
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LIST_REMOVE(device_bandwidths, c->blockio_device_bandwidths, b);
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free(b->path);
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free(b);
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}
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void cgroup_context_done(CGroupContext *c) {
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assert(c);
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while (c->io_device_weights)
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cgroup_context_free_io_device_weight(c, c->io_device_weights);
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while (c->io_device_latencies)
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cgroup_context_free_io_device_latency(c, c->io_device_latencies);
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while (c->io_device_limits)
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cgroup_context_free_io_device_limit(c, c->io_device_limits);
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while (c->blockio_device_weights)
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cgroup_context_free_blockio_device_weight(c, c->blockio_device_weights);
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while (c->blockio_device_bandwidths)
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cgroup_context_free_blockio_device_bandwidth(c, c->blockio_device_bandwidths);
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while (c->device_allow)
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cgroup_context_free_device_allow(c, c->device_allow);
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c->ip_address_allow = ip_address_access_free_all(c->ip_address_allow);
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c->ip_address_deny = ip_address_access_free_all(c->ip_address_deny);
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c->ip_filters_ingress = strv_free(c->ip_filters_ingress);
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c->ip_filters_egress = strv_free(c->ip_filters_egress);
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cpu_set_reset(&c->cpuset_cpus);
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cpu_set_reset(&c->cpuset_mems);
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}
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static int unit_get_kernel_memory_limit(Unit *u, const char *file, uint64_t *ret) {
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assert(u);
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if (!u->cgroup_realized)
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return -EOWNERDEAD;
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return cg_get_attribute_as_uint64("memory", u->cgroup_path, file, ret);
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}
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static int unit_compare_memory_limit(Unit *u, const char *property_name, uint64_t *ret_unit_value, uint64_t *ret_kernel_value) {
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CGroupContext *c;
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CGroupMask m;
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const char *file;
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uint64_t unit_value;
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int r;
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/* Compare kernel memcg configuration against our internal systemd state. Unsupported (and will
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* return -ENODATA) on cgroup v1.
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*
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* Returns:
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*
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* <0: On error.
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* 0: If the kernel memory setting doesn't match our configuration.
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* >0: If the kernel memory setting matches our configuration.
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*
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* The following values are only guaranteed to be populated on return >=0:
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*
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* - ret_unit_value will contain our internal expected value for the unit, page-aligned.
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* - ret_kernel_value will contain the actual value presented by the kernel. */
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assert(u);
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r = cg_all_unified();
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if (r < 0)
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return log_debug_errno(r, "Failed to determine cgroup hierarchy version: %m");
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/* Unsupported on v1.
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*
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* We don't return ENOENT, since that could actually mask a genuine problem where somebody else has
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* silently masked the controller. */
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if (r == 0)
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return -ENODATA;
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/* The root slice doesn't have any controller files, so we can't compare anything. */
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if (unit_has_name(u, SPECIAL_ROOT_SLICE))
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return -ENODATA;
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/* It's possible to have MemoryFoo set without systemd wanting to have the memory controller enabled,
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* for example, in the case of DisableControllers= or cgroup_disable on the kernel command line. To
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* avoid specious errors in these scenarios, check that we even expect the memory controller to be
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* enabled at all. */
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m = unit_get_target_mask(u);
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if (!FLAGS_SET(m, CGROUP_MASK_MEMORY))
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return -ENODATA;
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c = unit_get_cgroup_context(u);
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assert(c);
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if (streq(property_name, "MemoryLow")) {
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unit_value = unit_get_ancestor_memory_low(u);
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file = "memory.low";
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} else if (streq(property_name, "MemoryMin")) {
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unit_value = unit_get_ancestor_memory_min(u);
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file = "memory.min";
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} else if (streq(property_name, "MemoryHigh")) {
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unit_value = c->memory_high;
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file = "memory.high";
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} else if (streq(property_name, "MemoryMax")) {
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unit_value = c->memory_max;
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file = "memory.max";
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} else if (streq(property_name, "MemorySwapMax")) {
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unit_value = c->memory_swap_max;
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file = "memory.swap.max";
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} else
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return -EINVAL;
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r = unit_get_kernel_memory_limit(u, file, ret_kernel_value);
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if (r < 0)
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return log_unit_debug_errno(u, r, "Failed to parse %s: %m", file);
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/* It's intended (soon) in a future kernel to not expose cgroup memory limits rounded to page
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* boundaries, but instead separate the user-exposed limit, which is whatever userspace told us, from
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* our internal page-counting. To support those future kernels, just check the value itself first
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* without any page-alignment. */
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if (*ret_kernel_value == unit_value) {
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*ret_unit_value = unit_value;
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return 1;
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}
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/* The current kernel behaviour, by comparison, is that even if you write a particular number of
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* bytes into a cgroup memory file, it always returns that number page-aligned down (since the kernel
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* internally stores cgroup limits in pages). As such, so long as it aligns properly, everything is
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* cricket. */
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if (unit_value != CGROUP_LIMIT_MAX)
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unit_value = PAGE_ALIGN_DOWN(unit_value);
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*ret_unit_value = unit_value;
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return *ret_kernel_value == *ret_unit_value;
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}
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#define FORMAT_CGROUP_DIFF_MAX 128
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static char *format_cgroup_memory_limit_comparison(char *buf, size_t l, Unit *u, const char *property_name) {
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uint64_t kval, sval;
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int r;
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assert(u);
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assert(buf);
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assert(l > 0);
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r = unit_compare_memory_limit(u, property_name, &sval, &kval);
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/* memory.swap.max is special in that it relies on CONFIG_MEMCG_SWAP (and the default swapaccount=1).
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* In the absence of reliably being able to detect whether memcg swap support is available or not,
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* only complain if the error is not ENOENT. */
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if (r > 0 || IN_SET(r, -ENODATA, -EOWNERDEAD) ||
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(r == -ENOENT && streq(property_name, "MemorySwapMax"))) {
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buf[0] = 0;
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return buf;
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}
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if (r < 0) {
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snprintf(buf, l, " (error getting kernel value: %s)", strerror_safe(r));
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return buf;
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}
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snprintf(buf, l, " (different value in kernel: %" PRIu64 ")", kval);
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return buf;
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}
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void cgroup_context_dump(Unit *u, FILE* f, const char *prefix) {
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_cleanup_free_ char *disable_controllers_str = NULL, *cpuset_cpus = NULL, *cpuset_mems = NULL;
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CGroupIODeviceLimit *il;
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CGroupIODeviceWeight *iw;
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CGroupIODeviceLatency *l;
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CGroupBlockIODeviceBandwidth *b;
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CGroupBlockIODeviceWeight *w;
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CGroupDeviceAllow *a;
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CGroupContext *c;
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IPAddressAccessItem *iaai;
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char **path;
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char q[FORMAT_TIMESPAN_MAX];
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char v[FORMAT_TIMESPAN_MAX];
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char cda[FORMAT_CGROUP_DIFF_MAX];
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char cdb[FORMAT_CGROUP_DIFF_MAX];
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char cdc[FORMAT_CGROUP_DIFF_MAX];
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char cdd[FORMAT_CGROUP_DIFF_MAX];
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char cde[FORMAT_CGROUP_DIFF_MAX];
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assert(u);
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assert(f);
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c = unit_get_cgroup_context(u);
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assert(c);
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prefix = strempty(prefix);
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(void) cg_mask_to_string(c->disable_controllers, &disable_controllers_str);
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cpuset_cpus = cpu_set_to_range_string(&c->cpuset_cpus);
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cpuset_mems = cpu_set_to_range_string(&c->cpuset_mems);
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fprintf(f,
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"%sCPUAccounting: %s\n"
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"%sIOAccounting: %s\n"
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"%sBlockIOAccounting: %s\n"
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"%sMemoryAccounting: %s\n"
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"%sTasksAccounting: %s\n"
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"%sIPAccounting: %s\n"
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"%sCPUWeight: %" PRIu64 "\n"
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"%sStartupCPUWeight: %" PRIu64 "\n"
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"%sCPUShares: %" PRIu64 "\n"
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"%sStartupCPUShares: %" PRIu64 "\n"
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"%sCPUQuotaPerSecSec: %s\n"
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"%sCPUQuotaPeriodSec: %s\n"
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"%sAllowedCPUs: %s\n"
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"%sAllowedMemoryNodes: %s\n"
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"%sIOWeight: %" PRIu64 "\n"
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"%sStartupIOWeight: %" PRIu64 "\n"
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"%sBlockIOWeight: %" PRIu64 "\n"
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"%sStartupBlockIOWeight: %" PRIu64 "\n"
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"%sDefaultMemoryMin: %" PRIu64 "\n"
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"%sDefaultMemoryLow: %" PRIu64 "\n"
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"%sMemoryMin: %" PRIu64 "%s\n"
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"%sMemoryLow: %" PRIu64 "%s\n"
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"%sMemoryHigh: %" PRIu64 "%s\n"
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"%sMemoryMax: %" PRIu64 "%s\n"
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"%sMemorySwapMax: %" PRIu64 "%s\n"
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"%sMemoryLimit: %" PRIu64 "\n"
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"%sTasksMax: %" PRIu64 "\n"
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"%sDevicePolicy: %s\n"
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"%sDisableControllers: %s\n"
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"%sDelegate: %s\n",
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prefix, yes_no(c->cpu_accounting),
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prefix, yes_no(c->io_accounting),
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prefix, yes_no(c->blockio_accounting),
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prefix, yes_no(c->memory_accounting),
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prefix, yes_no(c->tasks_accounting),
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prefix, yes_no(c->ip_accounting),
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prefix, c->cpu_weight,
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prefix, c->startup_cpu_weight,
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prefix, c->cpu_shares,
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prefix, c->startup_cpu_shares,
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prefix, format_timespan(q, sizeof(q), c->cpu_quota_per_sec_usec, 1),
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prefix, format_timespan(v, sizeof(v), c->cpu_quota_period_usec, 1),
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prefix, strempty(cpuset_cpus),
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prefix, strempty(cpuset_mems),
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prefix, c->io_weight,
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prefix, c->startup_io_weight,
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prefix, c->blockio_weight,
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prefix, c->startup_blockio_weight,
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prefix, c->default_memory_min,
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prefix, c->default_memory_low,
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prefix, c->memory_min, format_cgroup_memory_limit_comparison(cda, sizeof(cda), u, "MemoryMin"),
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prefix, c->memory_low, format_cgroup_memory_limit_comparison(cdb, sizeof(cdb), u, "MemoryLow"),
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prefix, c->memory_high, format_cgroup_memory_limit_comparison(cdc, sizeof(cdc), u, "MemoryHigh"),
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prefix, c->memory_max, format_cgroup_memory_limit_comparison(cdd, sizeof(cdd), u, "MemoryMax"),
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prefix, c->memory_swap_max, format_cgroup_memory_limit_comparison(cde, sizeof(cde), u, "MemorySwapMax"),
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prefix, c->memory_limit,
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prefix, tasks_max_resolve(&c->tasks_max),
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prefix, cgroup_device_policy_to_string(c->device_policy),
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prefix, strempty(disable_controllers_str),
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prefix, yes_no(c->delegate));
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if (c->delegate) {
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_cleanup_free_ char *t = NULL;
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(void) cg_mask_to_string(c->delegate_controllers, &t);
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fprintf(f, "%sDelegateControllers: %s\n",
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prefix,
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strempty(t));
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}
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|
|
LIST_FOREACH(device_allow, a, c->device_allow)
|
|
fprintf(f,
|
|
"%sDeviceAllow: %s %s%s%s\n",
|
|
prefix,
|
|
a->path,
|
|
a->r ? "r" : "", a->w ? "w" : "", a->m ? "m" : "");
|
|
|
|
LIST_FOREACH(device_weights, iw, c->io_device_weights)
|
|
fprintf(f,
|
|
"%sIODeviceWeight: %s %" PRIu64 "\n",
|
|
prefix,
|
|
iw->path,
|
|
iw->weight);
|
|
|
|
LIST_FOREACH(device_latencies, l, c->io_device_latencies)
|
|
fprintf(f,
|
|
"%sIODeviceLatencyTargetSec: %s %s\n",
|
|
prefix,
|
|
l->path,
|
|
format_timespan(q, sizeof(q), l->target_usec, 1));
|
|
|
|
LIST_FOREACH(device_limits, il, c->io_device_limits) {
|
|
char buf[FORMAT_BYTES_MAX];
|
|
CGroupIOLimitType type;
|
|
|
|
for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
|
|
if (il->limits[type] != cgroup_io_limit_defaults[type])
|
|
fprintf(f,
|
|
"%s%s: %s %s\n",
|
|
prefix,
|
|
cgroup_io_limit_type_to_string(type),
|
|
il->path,
|
|
format_bytes(buf, sizeof(buf), il->limits[type]));
|
|
}
|
|
|
|
LIST_FOREACH(device_weights, w, c->blockio_device_weights)
|
|
fprintf(f,
|
|
"%sBlockIODeviceWeight: %s %" PRIu64,
|
|
prefix,
|
|
w->path,
|
|
w->weight);
|
|
|
|
LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
|
|
char buf[FORMAT_BYTES_MAX];
|
|
|
|
if (b->rbps != CGROUP_LIMIT_MAX)
|
|
fprintf(f,
|
|
"%sBlockIOReadBandwidth: %s %s\n",
|
|
prefix,
|
|
b->path,
|
|
format_bytes(buf, sizeof(buf), b->rbps));
|
|
if (b->wbps != CGROUP_LIMIT_MAX)
|
|
fprintf(f,
|
|
"%sBlockIOWriteBandwidth: %s %s\n",
|
|
prefix,
|
|
b->path,
|
|
format_bytes(buf, sizeof(buf), b->wbps));
|
|
}
|
|
|
|
LIST_FOREACH(items, iaai, c->ip_address_allow) {
|
|
_cleanup_free_ char *k = NULL;
|
|
|
|
(void) in_addr_to_string(iaai->family, &iaai->address, &k);
|
|
fprintf(f, "%sIPAddressAllow: %s/%u\n", prefix, strnull(k), iaai->prefixlen);
|
|
}
|
|
|
|
LIST_FOREACH(items, iaai, c->ip_address_deny) {
|
|
_cleanup_free_ char *k = NULL;
|
|
|
|
(void) in_addr_to_string(iaai->family, &iaai->address, &k);
|
|
fprintf(f, "%sIPAddressDeny: %s/%u\n", prefix, strnull(k), iaai->prefixlen);
|
|
}
|
|
|
|
STRV_FOREACH(path, c->ip_filters_ingress)
|
|
fprintf(f, "%sIPIngressFilterPath: %s\n", prefix, *path);
|
|
|
|
STRV_FOREACH(path, c->ip_filters_egress)
|
|
fprintf(f, "%sIPEgressFilterPath: %s\n", prefix, *path);
|
|
}
|
|
|
|
int cgroup_add_device_allow(CGroupContext *c, const char *dev, const char *mode) {
|
|
_cleanup_free_ CGroupDeviceAllow *a = NULL;
|
|
_cleanup_free_ char *d = NULL;
|
|
|
|
assert(c);
|
|
assert(dev);
|
|
assert(isempty(mode) || in_charset(mode, "rwm"));
|
|
|
|
a = new(CGroupDeviceAllow, 1);
|
|
if (!a)
|
|
return -ENOMEM;
|
|
|
|
d = strdup(dev);
|
|
if (!d)
|
|
return -ENOMEM;
|
|
|
|
*a = (CGroupDeviceAllow) {
|
|
.path = TAKE_PTR(d),
|
|
.r = isempty(mode) || strchr(mode, 'r'),
|
|
.w = isempty(mode) || strchr(mode, 'w'),
|
|
.m = isempty(mode) || strchr(mode, 'm'),
|
|
};
|
|
|
|
LIST_PREPEND(device_allow, c->device_allow, a);
|
|
TAKE_PTR(a);
|
|
|
|
return 0;
|
|
}
|
|
|
|
#define UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(entry) \
|
|
uint64_t unit_get_ancestor_##entry(Unit *u) { \
|
|
CGroupContext *c; \
|
|
\
|
|
/* 1. Is entry set in this unit? If so, use that. \
|
|
* 2. Is the default for this entry set in any \
|
|
* ancestor? If so, use that. \
|
|
* 3. Otherwise, return CGROUP_LIMIT_MIN. */ \
|
|
\
|
|
assert(u); \
|
|
\
|
|
c = unit_get_cgroup_context(u); \
|
|
if (c && c->entry##_set) \
|
|
return c->entry; \
|
|
\
|
|
while ((u = UNIT_DEREF(u->slice))) { \
|
|
c = unit_get_cgroup_context(u); \
|
|
if (c && c->default_##entry##_set) \
|
|
return c->default_##entry; \
|
|
} \
|
|
\
|
|
/* We've reached the root, but nobody had default for \
|
|
* this entry set, so set it to the kernel default. */ \
|
|
return CGROUP_LIMIT_MIN; \
|
|
}
|
|
|
|
UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(memory_low);
|
|
UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(memory_min);
|
|
|
|
static void cgroup_xattr_apply(Unit *u) {
|
|
char ids[SD_ID128_STRING_MAX];
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
if (!MANAGER_IS_SYSTEM(u->manager))
|
|
return;
|
|
|
|
if (!sd_id128_is_null(u->invocation_id)) {
|
|
r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
|
|
"trusted.invocation_id",
|
|
sd_id128_to_string(u->invocation_id, ids), 32,
|
|
0);
|
|
if (r < 0)
|
|
log_unit_debug_errno(u, r, "Failed to set invocation ID on control group %s, ignoring: %m", u->cgroup_path);
|
|
}
|
|
|
|
if (unit_cgroup_delegate(u)) {
|
|
r = cg_set_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path,
|
|
"trusted.delegate",
|
|
"1", 1,
|
|
0);
|
|
if (r < 0)
|
|
log_unit_debug_errno(u, r, "Failed to set delegate flag on control group %s, ignoring: %m", u->cgroup_path);
|
|
} else {
|
|
r = cg_remove_xattr(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "trusted.delegate");
|
|
if (r != -ENODATA)
|
|
log_unit_debug_errno(u, r, "Failed to remove delegate flag on control group %s, ignoring: %m", u->cgroup_path);
|
|
}
|
|
}
|
|
|
|
static int lookup_block_device(const char *p, dev_t *ret) {
|
|
dev_t rdev, dev = 0;
|
|
mode_t mode;
|
|
int r;
|
|
|
|
assert(p);
|
|
assert(ret);
|
|
|
|
r = device_path_parse_major_minor(p, &mode, &rdev);
|
|
if (r == -ENODEV) { /* not a parsable device node, need to go to disk */
|
|
struct stat st;
|
|
|
|
if (stat(p, &st) < 0)
|
|
return log_warning_errno(errno, "Couldn't stat device '%s': %m", p);
|
|
|
|
mode = st.st_mode;
|
|
rdev = st.st_rdev;
|
|
dev = st.st_dev;
|
|
} else if (r < 0)
|
|
return log_warning_errno(r, "Failed to parse major/minor from path '%s': %m", p);
|
|
|
|
if (S_ISCHR(mode))
|
|
return log_warning_errno(SYNTHETIC_ERRNO(ENOTBLK),
|
|
"Device node '%s' is a character device, but block device needed.", p);
|
|
if (S_ISBLK(mode))
|
|
*ret = rdev;
|
|
else if (major(dev) != 0)
|
|
*ret = dev; /* If this is not a device node then use the block device this file is stored on */
|
|
else {
|
|
/* If this is btrfs, getting the backing block device is a bit harder */
|
|
r = btrfs_get_block_device(p, ret);
|
|
if (r == -ENOTTY)
|
|
return log_warning_errno(SYNTHETIC_ERRNO(ENODEV),
|
|
"'%s' is not a block device node, and file system block device cannot be determined or is not local.", p);
|
|
if (r < 0)
|
|
return log_warning_errno(r, "Failed to determine block device backing btrfs file system '%s': %m", p);
|
|
}
|
|
|
|
/* If this is a LUKS/DM device, recursively try to get the originating block device */
|
|
while (block_get_originating(*ret, ret) > 0);
|
|
|
|
/* If this is a partition, try to get the originating block device */
|
|
(void) block_get_whole_disk(*ret, ret);
|
|
return 0;
|
|
}
|
|
|
|
static bool cgroup_context_has_cpu_weight(CGroupContext *c) {
|
|
return c->cpu_weight != CGROUP_WEIGHT_INVALID ||
|
|
c->startup_cpu_weight != CGROUP_WEIGHT_INVALID;
|
|
}
|
|
|
|
static bool cgroup_context_has_cpu_shares(CGroupContext *c) {
|
|
return c->cpu_shares != CGROUP_CPU_SHARES_INVALID ||
|
|
c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID;
|
|
}
|
|
|
|
static uint64_t cgroup_context_cpu_weight(CGroupContext *c, ManagerState state) {
|
|
if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
|
|
c->startup_cpu_weight != CGROUP_WEIGHT_INVALID)
|
|
return c->startup_cpu_weight;
|
|
else if (c->cpu_weight != CGROUP_WEIGHT_INVALID)
|
|
return c->cpu_weight;
|
|
else
|
|
return CGROUP_WEIGHT_DEFAULT;
|
|
}
|
|
|
|
static uint64_t cgroup_context_cpu_shares(CGroupContext *c, ManagerState state) {
|
|
if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
|
|
c->startup_cpu_shares != CGROUP_CPU_SHARES_INVALID)
|
|
return c->startup_cpu_shares;
|
|
else if (c->cpu_shares != CGROUP_CPU_SHARES_INVALID)
|
|
return c->cpu_shares;
|
|
else
|
|
return CGROUP_CPU_SHARES_DEFAULT;
|
|
}
|
|
|
|
usec_t cgroup_cpu_adjust_period(usec_t period, usec_t quota, usec_t resolution, usec_t max_period) {
|
|
/* kernel uses a minimum resolution of 1ms, so both period and (quota * period)
|
|
* need to be higher than that boundary. quota is specified in USecPerSec.
|
|
* Additionally, period must be at most max_period. */
|
|
assert(quota > 0);
|
|
|
|
return MIN(MAX3(period, resolution, resolution * USEC_PER_SEC / quota), max_period);
|
|
}
|
|
|
|
static usec_t cgroup_cpu_adjust_period_and_log(Unit *u, usec_t period, usec_t quota) {
|
|
usec_t new_period;
|
|
|
|
if (quota == USEC_INFINITY)
|
|
/* Always use default period for infinity quota. */
|
|
return CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC;
|
|
|
|
if (period == USEC_INFINITY)
|
|
/* Default period was requested. */
|
|
period = CGROUP_CPU_QUOTA_DEFAULT_PERIOD_USEC;
|
|
|
|
/* Clamp to interval [1ms, 1s] */
|
|
new_period = cgroup_cpu_adjust_period(period, quota, USEC_PER_MSEC, USEC_PER_SEC);
|
|
|
|
if (new_period != period) {
|
|
char v[FORMAT_TIMESPAN_MAX];
|
|
log_unit_full(u, u->warned_clamping_cpu_quota_period ? LOG_DEBUG : LOG_WARNING, 0,
|
|
"Clamping CPU interval for cpu.max: period is now %s",
|
|
format_timespan(v, sizeof(v), new_period, 1));
|
|
u->warned_clamping_cpu_quota_period = true;
|
|
}
|
|
|
|
return new_period;
|
|
}
|
|
|
|
static void cgroup_apply_unified_cpu_weight(Unit *u, uint64_t weight) {
|
|
char buf[DECIMAL_STR_MAX(uint64_t) + 2];
|
|
|
|
xsprintf(buf, "%" PRIu64 "\n", weight);
|
|
(void) set_attribute_and_warn(u, "cpu", "cpu.weight", buf);
|
|
}
|
|
|
|
static void cgroup_apply_unified_cpu_quota(Unit *u, usec_t quota, usec_t period) {
|
|
char buf[(DECIMAL_STR_MAX(usec_t) + 1) * 2 + 1];
|
|
|
|
period = cgroup_cpu_adjust_period_and_log(u, period, quota);
|
|
if (quota != USEC_INFINITY)
|
|
xsprintf(buf, USEC_FMT " " USEC_FMT "\n",
|
|
MAX(quota * period / USEC_PER_SEC, USEC_PER_MSEC), period);
|
|
else
|
|
xsprintf(buf, "max " USEC_FMT "\n", period);
|
|
(void) set_attribute_and_warn(u, "cpu", "cpu.max", buf);
|
|
}
|
|
|
|
static void cgroup_apply_legacy_cpu_shares(Unit *u, uint64_t shares) {
|
|
char buf[DECIMAL_STR_MAX(uint64_t) + 2];
|
|
|
|
xsprintf(buf, "%" PRIu64 "\n", shares);
|
|
(void) set_attribute_and_warn(u, "cpu", "cpu.shares", buf);
|
|
}
|
|
|
|
static void cgroup_apply_legacy_cpu_quota(Unit *u, usec_t quota, usec_t period) {
|
|
char buf[DECIMAL_STR_MAX(usec_t) + 2];
|
|
|
|
period = cgroup_cpu_adjust_period_and_log(u, period, quota);
|
|
|
|
xsprintf(buf, USEC_FMT "\n", period);
|
|
(void) set_attribute_and_warn(u, "cpu", "cpu.cfs_period_us", buf);
|
|
|
|
if (quota != USEC_INFINITY) {
|
|
xsprintf(buf, USEC_FMT "\n", MAX(quota * period / USEC_PER_SEC, USEC_PER_MSEC));
|
|
(void) set_attribute_and_warn(u, "cpu", "cpu.cfs_quota_us", buf);
|
|
} else
|
|
(void) set_attribute_and_warn(u, "cpu", "cpu.cfs_quota_us", "-1\n");
|
|
}
|
|
|
|
static uint64_t cgroup_cpu_shares_to_weight(uint64_t shares) {
|
|
return CLAMP(shares * CGROUP_WEIGHT_DEFAULT / CGROUP_CPU_SHARES_DEFAULT,
|
|
CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
|
|
}
|
|
|
|
static uint64_t cgroup_cpu_weight_to_shares(uint64_t weight) {
|
|
return CLAMP(weight * CGROUP_CPU_SHARES_DEFAULT / CGROUP_WEIGHT_DEFAULT,
|
|
CGROUP_CPU_SHARES_MIN, CGROUP_CPU_SHARES_MAX);
|
|
}
|
|
|
|
static void cgroup_apply_unified_cpuset(Unit *u, const CPUSet *cpus, const char *name) {
|
|
_cleanup_free_ char *buf = NULL;
|
|
|
|
buf = cpu_set_to_range_string(cpus);
|
|
if (!buf) {
|
|
log_oom();
|
|
return;
|
|
}
|
|
|
|
(void) set_attribute_and_warn(u, "cpuset", name, buf);
|
|
}
|
|
|
|
static bool cgroup_context_has_io_config(CGroupContext *c) {
|
|
return c->io_accounting ||
|
|
c->io_weight != CGROUP_WEIGHT_INVALID ||
|
|
c->startup_io_weight != CGROUP_WEIGHT_INVALID ||
|
|
c->io_device_weights ||
|
|
c->io_device_latencies ||
|
|
c->io_device_limits;
|
|
}
|
|
|
|
static bool cgroup_context_has_blockio_config(CGroupContext *c) {
|
|
return c->blockio_accounting ||
|
|
c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
|
|
c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID ||
|
|
c->blockio_device_weights ||
|
|
c->blockio_device_bandwidths;
|
|
}
|
|
|
|
static uint64_t cgroup_context_io_weight(CGroupContext *c, ManagerState state) {
|
|
if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
|
|
c->startup_io_weight != CGROUP_WEIGHT_INVALID)
|
|
return c->startup_io_weight;
|
|
else if (c->io_weight != CGROUP_WEIGHT_INVALID)
|
|
return c->io_weight;
|
|
else
|
|
return CGROUP_WEIGHT_DEFAULT;
|
|
}
|
|
|
|
static uint64_t cgroup_context_blkio_weight(CGroupContext *c, ManagerState state) {
|
|
if (IN_SET(state, MANAGER_STARTING, MANAGER_INITIALIZING) &&
|
|
c->startup_blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
|
|
return c->startup_blockio_weight;
|
|
else if (c->blockio_weight != CGROUP_BLKIO_WEIGHT_INVALID)
|
|
return c->blockio_weight;
|
|
else
|
|
return CGROUP_BLKIO_WEIGHT_DEFAULT;
|
|
}
|
|
|
|
static uint64_t cgroup_weight_blkio_to_io(uint64_t blkio_weight) {
|
|
return CLAMP(blkio_weight * CGROUP_WEIGHT_DEFAULT / CGROUP_BLKIO_WEIGHT_DEFAULT,
|
|
CGROUP_WEIGHT_MIN, CGROUP_WEIGHT_MAX);
|
|
}
|
|
|
|
static uint64_t cgroup_weight_io_to_blkio(uint64_t io_weight) {
|
|
return CLAMP(io_weight * CGROUP_BLKIO_WEIGHT_DEFAULT / CGROUP_WEIGHT_DEFAULT,
|
|
CGROUP_BLKIO_WEIGHT_MIN, CGROUP_BLKIO_WEIGHT_MAX);
|
|
}
|
|
|
|
static void cgroup_apply_io_device_weight(Unit *u, const char *dev_path, uint64_t io_weight) {
|
|
char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
|
|
dev_t dev;
|
|
int r;
|
|
|
|
r = lookup_block_device(dev_path, &dev);
|
|
if (r < 0)
|
|
return;
|
|
|
|
xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), io_weight);
|
|
(void) set_attribute_and_warn(u, "io", "io.weight", buf);
|
|
}
|
|
|
|
static void cgroup_apply_blkio_device_weight(Unit *u, const char *dev_path, uint64_t blkio_weight) {
|
|
char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
|
|
dev_t dev;
|
|
int r;
|
|
|
|
r = lookup_block_device(dev_path, &dev);
|
|
if (r < 0)
|
|
return;
|
|
|
|
xsprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), blkio_weight);
|
|
(void) set_attribute_and_warn(u, "blkio", "blkio.weight_device", buf);
|
|
}
|
|
|
|
static void cgroup_apply_io_device_latency(Unit *u, const char *dev_path, usec_t target) {
|
|
char buf[DECIMAL_STR_MAX(dev_t)*2+2+7+DECIMAL_STR_MAX(uint64_t)+1];
|
|
dev_t dev;
|
|
int r;
|
|
|
|
r = lookup_block_device(dev_path, &dev);
|
|
if (r < 0)
|
|
return;
|
|
|
|
if (target != USEC_INFINITY)
|
|
xsprintf(buf, "%u:%u target=%" PRIu64 "\n", major(dev), minor(dev), target);
|
|
else
|
|
xsprintf(buf, "%u:%u target=max\n", major(dev), minor(dev));
|
|
|
|
(void) set_attribute_and_warn(u, "io", "io.latency", buf);
|
|
}
|
|
|
|
static void cgroup_apply_io_device_limit(Unit *u, const char *dev_path, uint64_t *limits) {
|
|
char limit_bufs[_CGROUP_IO_LIMIT_TYPE_MAX][DECIMAL_STR_MAX(uint64_t)];
|
|
char buf[DECIMAL_STR_MAX(dev_t)*2+2+(6+DECIMAL_STR_MAX(uint64_t)+1)*4];
|
|
CGroupIOLimitType type;
|
|
dev_t dev;
|
|
int r;
|
|
|
|
r = lookup_block_device(dev_path, &dev);
|
|
if (r < 0)
|
|
return;
|
|
|
|
for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
|
|
if (limits[type] != cgroup_io_limit_defaults[type])
|
|
xsprintf(limit_bufs[type], "%" PRIu64, limits[type]);
|
|
else
|
|
xsprintf(limit_bufs[type], "%s", limits[type] == CGROUP_LIMIT_MAX ? "max" : "0");
|
|
|
|
xsprintf(buf, "%u:%u rbps=%s wbps=%s riops=%s wiops=%s\n", major(dev), minor(dev),
|
|
limit_bufs[CGROUP_IO_RBPS_MAX], limit_bufs[CGROUP_IO_WBPS_MAX],
|
|
limit_bufs[CGROUP_IO_RIOPS_MAX], limit_bufs[CGROUP_IO_WIOPS_MAX]);
|
|
(void) set_attribute_and_warn(u, "io", "io.max", buf);
|
|
}
|
|
|
|
static void cgroup_apply_blkio_device_limit(Unit *u, const char *dev_path, uint64_t rbps, uint64_t wbps) {
|
|
char buf[DECIMAL_STR_MAX(dev_t)*2+2+DECIMAL_STR_MAX(uint64_t)+1];
|
|
dev_t dev;
|
|
int r;
|
|
|
|
r = lookup_block_device(dev_path, &dev);
|
|
if (r < 0)
|
|
return;
|
|
|
|
sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), rbps);
|
|
(void) set_attribute_and_warn(u, "blkio", "blkio.throttle.read_bps_device", buf);
|
|
|
|
sprintf(buf, "%u:%u %" PRIu64 "\n", major(dev), minor(dev), wbps);
|
|
(void) set_attribute_and_warn(u, "blkio", "blkio.throttle.write_bps_device", buf);
|
|
}
|
|
|
|
static bool unit_has_unified_memory_config(Unit *u) {
|
|
CGroupContext *c;
|
|
|
|
assert(u);
|
|
|
|
c = unit_get_cgroup_context(u);
|
|
assert(c);
|
|
|
|
return unit_get_ancestor_memory_min(u) > 0 || unit_get_ancestor_memory_low(u) > 0 ||
|
|
c->memory_high != CGROUP_LIMIT_MAX || c->memory_max != CGROUP_LIMIT_MAX ||
|
|
c->memory_swap_max != CGROUP_LIMIT_MAX;
|
|
}
|
|
|
|
static void cgroup_apply_unified_memory_limit(Unit *u, const char *file, uint64_t v) {
|
|
char buf[DECIMAL_STR_MAX(uint64_t) + 1] = "max\n";
|
|
|
|
if (v != CGROUP_LIMIT_MAX)
|
|
xsprintf(buf, "%" PRIu64 "\n", v);
|
|
|
|
(void) set_attribute_and_warn(u, "memory", file, buf);
|
|
}
|
|
|
|
static void cgroup_apply_firewall(Unit *u) {
|
|
assert(u);
|
|
|
|
/* Best-effort: let's apply IP firewalling and/or accounting if that's enabled */
|
|
|
|
if (bpf_firewall_compile(u) < 0)
|
|
return;
|
|
|
|
(void) bpf_firewall_load_custom(u);
|
|
(void) bpf_firewall_install(u);
|
|
}
|
|
|
|
static int cgroup_apply_devices(Unit *u) {
|
|
_cleanup_(bpf_program_unrefp) BPFProgram *prog = NULL;
|
|
const char *path;
|
|
CGroupContext *c;
|
|
CGroupDeviceAllow *a;
|
|
CGroupDevicePolicy policy;
|
|
int r;
|
|
|
|
assert_se(c = unit_get_cgroup_context(u));
|
|
assert_se(path = u->cgroup_path);
|
|
|
|
policy = c->device_policy;
|
|
|
|
if (cg_all_unified() > 0) {
|
|
r = bpf_devices_cgroup_init(&prog, policy, c->device_allow);
|
|
if (r < 0)
|
|
return log_unit_warning_errno(u, r, "Failed to initialize device control bpf program: %m");
|
|
|
|
} else {
|
|
/* Changing the devices list of a populated cgroup might result in EINVAL, hence ignore
|
|
* EINVAL here. */
|
|
|
|
if (c->device_allow || policy != CGROUP_DEVICE_POLICY_AUTO)
|
|
r = cg_set_attribute("devices", path, "devices.deny", "a");
|
|
else
|
|
r = cg_set_attribute("devices", path, "devices.allow", "a");
|
|
if (r < 0)
|
|
log_unit_full(u, IN_SET(r, -ENOENT, -EROFS, -EINVAL, -EACCES, -EPERM) ? LOG_DEBUG : LOG_WARNING, r,
|
|
"Failed to reset devices.allow/devices.deny: %m");
|
|
}
|
|
|
|
bool whitelist_static = policy == CGROUP_DEVICE_POLICY_CLOSED ||
|
|
(policy == CGROUP_DEVICE_POLICY_AUTO && c->device_allow);
|
|
if (whitelist_static)
|
|
(void) bpf_devices_whitelist_static(prog, path);
|
|
|
|
bool any = whitelist_static;
|
|
LIST_FOREACH(device_allow, a, c->device_allow) {
|
|
char acc[4], *val;
|
|
unsigned k = 0;
|
|
|
|
if (a->r)
|
|
acc[k++] = 'r';
|
|
if (a->w)
|
|
acc[k++] = 'w';
|
|
if (a->m)
|
|
acc[k++] = 'm';
|
|
if (k == 0)
|
|
continue;
|
|
acc[k++] = 0;
|
|
|
|
if (path_startswith(a->path, "/dev/"))
|
|
r = bpf_devices_whitelist_device(prog, path, a->path, acc);
|
|
else if ((val = startswith(a->path, "block-")))
|
|
r = bpf_devices_whitelist_major(prog, path, val, 'b', acc);
|
|
else if ((val = startswith(a->path, "char-")))
|
|
r = bpf_devices_whitelist_major(prog, path, val, 'c', acc);
|
|
else {
|
|
log_unit_debug(u, "Ignoring device '%s' while writing cgroup attribute.", a->path);
|
|
continue;
|
|
}
|
|
|
|
if (r >= 0)
|
|
any = true;
|
|
}
|
|
|
|
if (prog && !any) {
|
|
log_unit_warning_errno(u, SYNTHETIC_ERRNO(ENODEV), "No devices matched by device filter.");
|
|
|
|
/* The kernel verifier would reject a program we would build with the normal intro and outro
|
|
but no whitelisting rules (outro would contain an unreachable instruction for successful
|
|
return). */
|
|
policy = CGROUP_DEVICE_POLICY_STRICT;
|
|
}
|
|
|
|
r = bpf_devices_apply_policy(prog, policy, any, path, &u->bpf_device_control_installed);
|
|
if (r < 0) {
|
|
static bool warned = false;
|
|
|
|
log_full_errno(warned ? LOG_DEBUG : LOG_WARNING, r,
|
|
"Unit %s configures device ACL, but the local system doesn't seem to support the BPF-based device controller.\n"
|
|
"Proceeding WITHOUT applying ACL (all devices will be accessible)!\n"
|
|
"(This warning is only shown for the first loaded unit using device ACL.)", u->id);
|
|
|
|
warned = true;
|
|
}
|
|
return r;
|
|
}
|
|
|
|
static void cgroup_context_apply(
|
|
Unit *u,
|
|
CGroupMask apply_mask,
|
|
ManagerState state) {
|
|
|
|
const char *path;
|
|
CGroupContext *c;
|
|
bool is_host_root, is_local_root;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
/* Nothing to do? Exit early! */
|
|
if (apply_mask == 0)
|
|
return;
|
|
|
|
/* Some cgroup attributes are not supported on the host root cgroup, hence silently ignore them here. And other
|
|
* attributes should only be managed for cgroups further down the tree. */
|
|
is_local_root = unit_has_name(u, SPECIAL_ROOT_SLICE);
|
|
is_host_root = unit_has_host_root_cgroup(u);
|
|
|
|
assert_se(c = unit_get_cgroup_context(u));
|
|
assert_se(path = u->cgroup_path);
|
|
|
|
if (is_local_root) /* Make sure we don't try to display messages with an empty path. */
|
|
path = "/";
|
|
|
|
/* We generally ignore errors caused by read-only mounted cgroup trees (assuming we are running in a container
|
|
* then), and missing cgroups, i.e. EROFS and ENOENT. */
|
|
|
|
/* In fully unified mode these attributes don't exist on the host cgroup root. On legacy the weights exist, but
|
|
* setting the weight makes very little sense on the host root cgroup, as there are no other cgroups at this
|
|
* level. The quota exists there too, but any attempt to write to it is refused with EINVAL. Inside of
|
|
* containers we want to leave control of these to the container manager (and if cgroup v2 delegation is used
|
|
* we couldn't even write to them if we wanted to). */
|
|
if ((apply_mask & CGROUP_MASK_CPU) && !is_local_root) {
|
|
|
|
if (cg_all_unified() > 0) {
|
|
uint64_t weight;
|
|
|
|
if (cgroup_context_has_cpu_weight(c))
|
|
weight = cgroup_context_cpu_weight(c, state);
|
|
else if (cgroup_context_has_cpu_shares(c)) {
|
|
uint64_t shares;
|
|
|
|
shares = cgroup_context_cpu_shares(c, state);
|
|
weight = cgroup_cpu_shares_to_weight(shares);
|
|
|
|
log_cgroup_compat(u, "Applying [Startup]CPUShares=%" PRIu64 " as [Startup]CPUWeight=%" PRIu64 " on %s",
|
|
shares, weight, path);
|
|
} else
|
|
weight = CGROUP_WEIGHT_DEFAULT;
|
|
|
|
cgroup_apply_unified_cpu_weight(u, weight);
|
|
cgroup_apply_unified_cpu_quota(u, c->cpu_quota_per_sec_usec, c->cpu_quota_period_usec);
|
|
|
|
} else {
|
|
uint64_t shares;
|
|
|
|
if (cgroup_context_has_cpu_weight(c)) {
|
|
uint64_t weight;
|
|
|
|
weight = cgroup_context_cpu_weight(c, state);
|
|
shares = cgroup_cpu_weight_to_shares(weight);
|
|
|
|
log_cgroup_compat(u, "Applying [Startup]CPUWeight=%" PRIu64 " as [Startup]CPUShares=%" PRIu64 " on %s",
|
|
weight, shares, path);
|
|
} else if (cgroup_context_has_cpu_shares(c))
|
|
shares = cgroup_context_cpu_shares(c, state);
|
|
else
|
|
shares = CGROUP_CPU_SHARES_DEFAULT;
|
|
|
|
cgroup_apply_legacy_cpu_shares(u, shares);
|
|
cgroup_apply_legacy_cpu_quota(u, c->cpu_quota_per_sec_usec, c->cpu_quota_period_usec);
|
|
}
|
|
}
|
|
|
|
if ((apply_mask & CGROUP_MASK_CPUSET) && !is_local_root) {
|
|
cgroup_apply_unified_cpuset(u, &c->cpuset_cpus, "cpuset.cpus");
|
|
cgroup_apply_unified_cpuset(u, &c->cpuset_mems, "cpuset.mems");
|
|
}
|
|
|
|
/* The 'io' controller attributes are not exported on the host's root cgroup (being a pure cgroup v2
|
|
* controller), and in case of containers we want to leave control of these attributes to the container manager
|
|
* (and we couldn't access that stuff anyway, even if we tried if proper delegation is used). */
|
|
if ((apply_mask & CGROUP_MASK_IO) && !is_local_root) {
|
|
char buf[8+DECIMAL_STR_MAX(uint64_t)+1];
|
|
bool has_io, has_blockio;
|
|
uint64_t weight;
|
|
|
|
has_io = cgroup_context_has_io_config(c);
|
|
has_blockio = cgroup_context_has_blockio_config(c);
|
|
|
|
if (has_io)
|
|
weight = cgroup_context_io_weight(c, state);
|
|
else if (has_blockio) {
|
|
uint64_t blkio_weight;
|
|
|
|
blkio_weight = cgroup_context_blkio_weight(c, state);
|
|
weight = cgroup_weight_blkio_to_io(blkio_weight);
|
|
|
|
log_cgroup_compat(u, "Applying [Startup]BlockIOWeight=%" PRIu64 " as [Startup]IOWeight=%" PRIu64,
|
|
blkio_weight, weight);
|
|
} else
|
|
weight = CGROUP_WEIGHT_DEFAULT;
|
|
|
|
xsprintf(buf, "default %" PRIu64 "\n", weight);
|
|
(void) set_attribute_and_warn(u, "io", "io.weight", buf);
|
|
|
|
/* FIXME: drop this when distro kernels properly support BFQ through "io.weight"
|
|
* See also: https://github.com/systemd/systemd/pull/13335 */
|
|
xsprintf(buf, "%" PRIu64 "\n", weight);
|
|
(void) set_attribute_and_warn(u, "io", "io.bfq.weight", buf);
|
|
|
|
if (has_io) {
|
|
CGroupIODeviceLatency *latency;
|
|
CGroupIODeviceLimit *limit;
|
|
CGroupIODeviceWeight *w;
|
|
|
|
LIST_FOREACH(device_weights, w, c->io_device_weights)
|
|
cgroup_apply_io_device_weight(u, w->path, w->weight);
|
|
|
|
LIST_FOREACH(device_limits, limit, c->io_device_limits)
|
|
cgroup_apply_io_device_limit(u, limit->path, limit->limits);
|
|
|
|
LIST_FOREACH(device_latencies, latency, c->io_device_latencies)
|
|
cgroup_apply_io_device_latency(u, latency->path, latency->target_usec);
|
|
|
|
} else if (has_blockio) {
|
|
CGroupBlockIODeviceWeight *w;
|
|
CGroupBlockIODeviceBandwidth *b;
|
|
|
|
LIST_FOREACH(device_weights, w, c->blockio_device_weights) {
|
|
weight = cgroup_weight_blkio_to_io(w->weight);
|
|
|
|
log_cgroup_compat(u, "Applying BlockIODeviceWeight=%" PRIu64 " as IODeviceWeight=%" PRIu64 " for %s",
|
|
w->weight, weight, w->path);
|
|
|
|
cgroup_apply_io_device_weight(u, w->path, weight);
|
|
}
|
|
|
|
LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths) {
|
|
uint64_t limits[_CGROUP_IO_LIMIT_TYPE_MAX];
|
|
CGroupIOLimitType type;
|
|
|
|
for (type = 0; type < _CGROUP_IO_LIMIT_TYPE_MAX; type++)
|
|
limits[type] = cgroup_io_limit_defaults[type];
|
|
|
|
limits[CGROUP_IO_RBPS_MAX] = b->rbps;
|
|
limits[CGROUP_IO_WBPS_MAX] = b->wbps;
|
|
|
|
log_cgroup_compat(u, "Applying BlockIO{Read|Write}Bandwidth=%" PRIu64 " %" PRIu64 " as IO{Read|Write}BandwidthMax= for %s",
|
|
b->rbps, b->wbps, b->path);
|
|
|
|
cgroup_apply_io_device_limit(u, b->path, limits);
|
|
}
|
|
}
|
|
}
|
|
|
|
if (apply_mask & CGROUP_MASK_BLKIO) {
|
|
bool has_io, has_blockio;
|
|
|
|
has_io = cgroup_context_has_io_config(c);
|
|
has_blockio = cgroup_context_has_blockio_config(c);
|
|
|
|
/* Applying a 'weight' never makes sense for the host root cgroup, and for containers this should be
|
|
* left to our container manager, too. */
|
|
if (!is_local_root) {
|
|
char buf[DECIMAL_STR_MAX(uint64_t)+1];
|
|
uint64_t weight;
|
|
|
|
if (has_io) {
|
|
uint64_t io_weight;
|
|
|
|
io_weight = cgroup_context_io_weight(c, state);
|
|
weight = cgroup_weight_io_to_blkio(cgroup_context_io_weight(c, state));
|
|
|
|
log_cgroup_compat(u, "Applying [Startup]IOWeight=%" PRIu64 " as [Startup]BlockIOWeight=%" PRIu64,
|
|
io_weight, weight);
|
|
} else if (has_blockio)
|
|
weight = cgroup_context_blkio_weight(c, state);
|
|
else
|
|
weight = CGROUP_BLKIO_WEIGHT_DEFAULT;
|
|
|
|
xsprintf(buf, "%" PRIu64 "\n", weight);
|
|
(void) set_attribute_and_warn(u, "blkio", "blkio.weight", buf);
|
|
|
|
if (has_io) {
|
|
CGroupIODeviceWeight *w;
|
|
|
|
LIST_FOREACH(device_weights, w, c->io_device_weights) {
|
|
weight = cgroup_weight_io_to_blkio(w->weight);
|
|
|
|
log_cgroup_compat(u, "Applying IODeviceWeight=%" PRIu64 " as BlockIODeviceWeight=%" PRIu64 " for %s",
|
|
w->weight, weight, w->path);
|
|
|
|
cgroup_apply_blkio_device_weight(u, w->path, weight);
|
|
}
|
|
} else if (has_blockio) {
|
|
CGroupBlockIODeviceWeight *w;
|
|
|
|
LIST_FOREACH(device_weights, w, c->blockio_device_weights)
|
|
cgroup_apply_blkio_device_weight(u, w->path, w->weight);
|
|
}
|
|
}
|
|
|
|
/* The bandwidth limits are something that make sense to be applied to the host's root but not container
|
|
* roots, as there we want the container manager to handle it */
|
|
if (is_host_root || !is_local_root) {
|
|
if (has_io) {
|
|
CGroupIODeviceLimit *l;
|
|
|
|
LIST_FOREACH(device_limits, l, c->io_device_limits) {
|
|
log_cgroup_compat(u, "Applying IO{Read|Write}Bandwidth=%" PRIu64 " %" PRIu64 " as BlockIO{Read|Write}BandwidthMax= for %s",
|
|
l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX], l->path);
|
|
|
|
cgroup_apply_blkio_device_limit(u, l->path, l->limits[CGROUP_IO_RBPS_MAX], l->limits[CGROUP_IO_WBPS_MAX]);
|
|
}
|
|
} else if (has_blockio) {
|
|
CGroupBlockIODeviceBandwidth *b;
|
|
|
|
LIST_FOREACH(device_bandwidths, b, c->blockio_device_bandwidths)
|
|
cgroup_apply_blkio_device_limit(u, b->path, b->rbps, b->wbps);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* In unified mode 'memory' attributes do not exist on the root cgroup. In legacy mode 'memory.limit_in_bytes'
|
|
* exists on the root cgroup, but any writes to it are refused with EINVAL. And if we run in a container we
|
|
* want to leave control to the container manager (and if proper cgroup v2 delegation is used we couldn't even
|
|
* write to this if we wanted to.) */
|
|
if ((apply_mask & CGROUP_MASK_MEMORY) && !is_local_root) {
|
|
|
|
if (cg_all_unified() > 0) {
|
|
uint64_t max, swap_max = CGROUP_LIMIT_MAX;
|
|
|
|
if (unit_has_unified_memory_config(u)) {
|
|
max = c->memory_max;
|
|
swap_max = c->memory_swap_max;
|
|
} else {
|
|
max = c->memory_limit;
|
|
|
|
if (max != CGROUP_LIMIT_MAX)
|
|
log_cgroup_compat(u, "Applying MemoryLimit=%" PRIu64 " as MemoryMax=", max);
|
|
}
|
|
|
|
cgroup_apply_unified_memory_limit(u, "memory.min", unit_get_ancestor_memory_min(u));
|
|
cgroup_apply_unified_memory_limit(u, "memory.low", unit_get_ancestor_memory_low(u));
|
|
cgroup_apply_unified_memory_limit(u, "memory.high", c->memory_high);
|
|
cgroup_apply_unified_memory_limit(u, "memory.max", max);
|
|
cgroup_apply_unified_memory_limit(u, "memory.swap.max", swap_max);
|
|
|
|
(void) set_attribute_and_warn(u, "memory", "memory.oom.group", one_zero(c->memory_oom_group));
|
|
|
|
} else {
|
|
char buf[DECIMAL_STR_MAX(uint64_t) + 1];
|
|
uint64_t val;
|
|
|
|
if (unit_has_unified_memory_config(u)) {
|
|
val = c->memory_max;
|
|
log_cgroup_compat(u, "Applying MemoryMax=%" PRIi64 " as MemoryLimit=", val);
|
|
} else
|
|
val = c->memory_limit;
|
|
|
|
if (val == CGROUP_LIMIT_MAX)
|
|
strncpy(buf, "-1\n", sizeof(buf));
|
|
else
|
|
xsprintf(buf, "%" PRIu64 "\n", val);
|
|
|
|
(void) set_attribute_and_warn(u, "memory", "memory.limit_in_bytes", buf);
|
|
}
|
|
}
|
|
|
|
/* On cgroup v2 we can apply BPF everywhere. On cgroup v1 we apply it everywhere except for the root of
|
|
* containers, where we leave this to the manager */
|
|
if ((apply_mask & (CGROUP_MASK_DEVICES | CGROUP_MASK_BPF_DEVICES)) &&
|
|
(is_host_root || cg_all_unified() > 0 || !is_local_root))
|
|
(void) cgroup_apply_devices(u);
|
|
|
|
if (apply_mask & CGROUP_MASK_PIDS) {
|
|
|
|
if (is_host_root) {
|
|
/* So, the "pids" controller does not expose anything on the root cgroup, in order not to
|
|
* replicate knobs exposed elsewhere needlessly. We abstract this away here however, and when
|
|
* the knobs of the root cgroup are modified propagate this to the relevant sysctls. There's a
|
|
* non-obvious asymmetry however: unlike the cgroup properties we don't really want to take
|
|
* exclusive ownership of the sysctls, but we still want to honour things if the user sets
|
|
* limits. Hence we employ sort of a one-way strategy: when the user sets a bounded limit
|
|
* through us it counts. When the user afterwards unsets it again (i.e. sets it to unbounded)
|
|
* it also counts. But if the user never set a limit through us (i.e. we are the default of
|
|
* "unbounded") we leave things unmodified. For this we manage a global boolean that we turn on
|
|
* the first time we set a limit. Note that this boolean is flushed out on manager reload,
|
|
* which is desirable so that there's an official way to release control of the sysctl from
|
|
* systemd: set the limit to unbounded and reload. */
|
|
|
|
if (tasks_max_isset(&c->tasks_max)) {
|
|
u->manager->sysctl_pid_max_changed = true;
|
|
r = procfs_tasks_set_limit(tasks_max_resolve(&c->tasks_max));
|
|
} else if (u->manager->sysctl_pid_max_changed)
|
|
r = procfs_tasks_set_limit(TASKS_MAX);
|
|
else
|
|
r = 0;
|
|
if (r < 0)
|
|
log_unit_full(u, LOG_LEVEL_CGROUP_WRITE(r), r,
|
|
"Failed to write to tasks limit sysctls: %m");
|
|
}
|
|
|
|
/* The attribute itself is not available on the host root cgroup, and in the container case we want to
|
|
* leave it for the container manager. */
|
|
if (!is_local_root) {
|
|
if (tasks_max_isset(&c->tasks_max)) {
|
|
char buf[DECIMAL_STR_MAX(uint64_t) + 1];
|
|
|
|
xsprintf(buf, "%" PRIu64 "\n", tasks_max_resolve(&c->tasks_max));
|
|
(void) set_attribute_and_warn(u, "pids", "pids.max", buf);
|
|
} else
|
|
(void) set_attribute_and_warn(u, "pids", "pids.max", "max\n");
|
|
}
|
|
}
|
|
|
|
if (apply_mask & CGROUP_MASK_BPF_FIREWALL)
|
|
cgroup_apply_firewall(u);
|
|
}
|
|
|
|
static bool unit_get_needs_bpf_firewall(Unit *u) {
|
|
CGroupContext *c;
|
|
Unit *p;
|
|
assert(u);
|
|
|
|
c = unit_get_cgroup_context(u);
|
|
if (!c)
|
|
return false;
|
|
|
|
if (c->ip_accounting ||
|
|
c->ip_address_allow ||
|
|
c->ip_address_deny ||
|
|
c->ip_filters_ingress ||
|
|
c->ip_filters_egress)
|
|
return true;
|
|
|
|
/* If any parent slice has an IP access list defined, it applies too */
|
|
for (p = UNIT_DEREF(u->slice); p; p = UNIT_DEREF(p->slice)) {
|
|
c = unit_get_cgroup_context(p);
|
|
if (!c)
|
|
return false;
|
|
|
|
if (c->ip_address_allow ||
|
|
c->ip_address_deny)
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static CGroupMask unit_get_cgroup_mask(Unit *u) {
|
|
CGroupMask mask = 0;
|
|
CGroupContext *c;
|
|
|
|
assert(u);
|
|
|
|
c = unit_get_cgroup_context(u);
|
|
|
|
assert(c);
|
|
|
|
/* Figure out which controllers we need, based on the cgroup context object */
|
|
|
|
if (c->cpu_accounting)
|
|
mask |= get_cpu_accounting_mask();
|
|
|
|
if (cgroup_context_has_cpu_weight(c) ||
|
|
cgroup_context_has_cpu_shares(c) ||
|
|
c->cpu_quota_per_sec_usec != USEC_INFINITY)
|
|
mask |= CGROUP_MASK_CPU;
|
|
|
|
if (c->cpuset_cpus.set || c->cpuset_mems.set)
|
|
mask |= CGROUP_MASK_CPUSET;
|
|
|
|
if (cgroup_context_has_io_config(c) || cgroup_context_has_blockio_config(c))
|
|
mask |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
|
|
|
|
if (c->memory_accounting ||
|
|
c->memory_limit != CGROUP_LIMIT_MAX ||
|
|
unit_has_unified_memory_config(u))
|
|
mask |= CGROUP_MASK_MEMORY;
|
|
|
|
if (c->device_allow ||
|
|
c->device_policy != CGROUP_DEVICE_POLICY_AUTO)
|
|
mask |= CGROUP_MASK_DEVICES | CGROUP_MASK_BPF_DEVICES;
|
|
|
|
if (c->tasks_accounting ||
|
|
tasks_max_isset(&c->tasks_max))
|
|
mask |= CGROUP_MASK_PIDS;
|
|
|
|
return CGROUP_MASK_EXTEND_JOINED(mask);
|
|
}
|
|
|
|
static CGroupMask unit_get_bpf_mask(Unit *u) {
|
|
CGroupMask mask = 0;
|
|
|
|
/* Figure out which controllers we need, based on the cgroup context, possibly taking into account children
|
|
* too. */
|
|
|
|
if (unit_get_needs_bpf_firewall(u))
|
|
mask |= CGROUP_MASK_BPF_FIREWALL;
|
|
|
|
return mask;
|
|
}
|
|
|
|
CGroupMask unit_get_own_mask(Unit *u) {
|
|
CGroupContext *c;
|
|
|
|
/* Returns the mask of controllers the unit needs for itself. If a unit is not properly loaded, return an empty
|
|
* mask, as we shouldn't reflect it in the cgroup hierarchy then. */
|
|
|
|
if (u->load_state != UNIT_LOADED)
|
|
return 0;
|
|
|
|
c = unit_get_cgroup_context(u);
|
|
if (!c)
|
|
return 0;
|
|
|
|
return (unit_get_cgroup_mask(u) | unit_get_bpf_mask(u) | unit_get_delegate_mask(u)) & ~unit_get_ancestor_disable_mask(u);
|
|
}
|
|
|
|
CGroupMask unit_get_delegate_mask(Unit *u) {
|
|
CGroupContext *c;
|
|
|
|
/* If delegation is turned on, then turn on selected controllers, unless we are on the legacy hierarchy and the
|
|
* process we fork into is known to drop privileges, and hence shouldn't get access to the controllers.
|
|
*
|
|
* Note that on the unified hierarchy it is safe to delegate controllers to unprivileged services. */
|
|
|
|
if (!unit_cgroup_delegate(u))
|
|
return 0;
|
|
|
|
if (cg_all_unified() <= 0) {
|
|
ExecContext *e;
|
|
|
|
e = unit_get_exec_context(u);
|
|
if (e && !exec_context_maintains_privileges(e))
|
|
return 0;
|
|
}
|
|
|
|
assert_se(c = unit_get_cgroup_context(u));
|
|
return CGROUP_MASK_EXTEND_JOINED(c->delegate_controllers);
|
|
}
|
|
|
|
CGroupMask unit_get_members_mask(Unit *u) {
|
|
assert(u);
|
|
|
|
/* Returns the mask of controllers all of the unit's children require, merged */
|
|
|
|
if (u->cgroup_members_mask_valid)
|
|
return u->cgroup_members_mask; /* Use cached value if possible */
|
|
|
|
u->cgroup_members_mask = 0;
|
|
|
|
if (u->type == UNIT_SLICE) {
|
|
void *v;
|
|
Unit *member;
|
|
Iterator i;
|
|
|
|
HASHMAP_FOREACH_KEY(v, member, u->dependencies[UNIT_BEFORE], i)
|
|
if (UNIT_DEREF(member->slice) == u)
|
|
u->cgroup_members_mask |= unit_get_subtree_mask(member); /* note that this calls ourselves again, for the children */
|
|
}
|
|
|
|
u->cgroup_members_mask_valid = true;
|
|
return u->cgroup_members_mask;
|
|
}
|
|
|
|
CGroupMask unit_get_siblings_mask(Unit *u) {
|
|
assert(u);
|
|
|
|
/* Returns the mask of controllers all of the unit's siblings
|
|
* require, i.e. the members mask of the unit's parent slice
|
|
* if there is one. */
|
|
|
|
if (UNIT_ISSET(u->slice))
|
|
return unit_get_members_mask(UNIT_DEREF(u->slice));
|
|
|
|
return unit_get_subtree_mask(u); /* we are the top-level slice */
|
|
}
|
|
|
|
CGroupMask unit_get_disable_mask(Unit *u) {
|
|
CGroupContext *c;
|
|
|
|
c = unit_get_cgroup_context(u);
|
|
if (!c)
|
|
return 0;
|
|
|
|
return c->disable_controllers;
|
|
}
|
|
|
|
CGroupMask unit_get_ancestor_disable_mask(Unit *u) {
|
|
CGroupMask mask;
|
|
|
|
assert(u);
|
|
mask = unit_get_disable_mask(u);
|
|
|
|
/* Returns the mask of controllers which are marked as forcibly
|
|
* disabled in any ancestor unit or the unit in question. */
|
|
|
|
if (UNIT_ISSET(u->slice))
|
|
mask |= unit_get_ancestor_disable_mask(UNIT_DEREF(u->slice));
|
|
|
|
return mask;
|
|
}
|
|
|
|
CGroupMask unit_get_subtree_mask(Unit *u) {
|
|
|
|
/* Returns the mask of this subtree, meaning of the group
|
|
* itself and its children. */
|
|
|
|
return unit_get_own_mask(u) | unit_get_members_mask(u);
|
|
}
|
|
|
|
CGroupMask unit_get_target_mask(Unit *u) {
|
|
CGroupMask mask;
|
|
|
|
/* This returns the cgroup mask of all controllers to enable
|
|
* for a specific cgroup, i.e. everything it needs itself,
|
|
* plus all that its children need, plus all that its siblings
|
|
* need. This is primarily useful on the legacy cgroup
|
|
* hierarchy, where we need to duplicate each cgroup in each
|
|
* hierarchy that shall be enabled for it. */
|
|
|
|
mask = unit_get_own_mask(u) | unit_get_members_mask(u) | unit_get_siblings_mask(u);
|
|
|
|
if (mask & CGROUP_MASK_BPF_FIREWALL & ~u->manager->cgroup_supported)
|
|
emit_bpf_firewall_warning(u);
|
|
|
|
mask &= u->manager->cgroup_supported;
|
|
mask &= ~unit_get_ancestor_disable_mask(u);
|
|
|
|
return mask;
|
|
}
|
|
|
|
CGroupMask unit_get_enable_mask(Unit *u) {
|
|
CGroupMask mask;
|
|
|
|
/* This returns the cgroup mask of all controllers to enable
|
|
* for the children of a specific cgroup. This is primarily
|
|
* useful for the unified cgroup hierarchy, where each cgroup
|
|
* controls which controllers are enabled for its children. */
|
|
|
|
mask = unit_get_members_mask(u);
|
|
mask &= u->manager->cgroup_supported;
|
|
mask &= ~unit_get_ancestor_disable_mask(u);
|
|
|
|
return mask;
|
|
}
|
|
|
|
void unit_invalidate_cgroup_members_masks(Unit *u) {
|
|
assert(u);
|
|
|
|
/* Recurse invalidate the member masks cache all the way up the tree */
|
|
u->cgroup_members_mask_valid = false;
|
|
|
|
if (UNIT_ISSET(u->slice))
|
|
unit_invalidate_cgroup_members_masks(UNIT_DEREF(u->slice));
|
|
}
|
|
|
|
const char *unit_get_realized_cgroup_path(Unit *u, CGroupMask mask) {
|
|
|
|
/* Returns the realized cgroup path of the specified unit where all specified controllers are available. */
|
|
|
|
while (u) {
|
|
|
|
if (u->cgroup_path &&
|
|
u->cgroup_realized &&
|
|
FLAGS_SET(u->cgroup_realized_mask, mask))
|
|
return u->cgroup_path;
|
|
|
|
u = UNIT_DEREF(u->slice);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static const char *migrate_callback(CGroupMask mask, void *userdata) {
|
|
return unit_get_realized_cgroup_path(userdata, mask);
|
|
}
|
|
|
|
char *unit_default_cgroup_path(const Unit *u) {
|
|
_cleanup_free_ char *escaped = NULL, *slice = NULL;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
if (unit_has_name(u, SPECIAL_ROOT_SLICE))
|
|
return strdup(u->manager->cgroup_root);
|
|
|
|
if (UNIT_ISSET(u->slice) && !unit_has_name(UNIT_DEREF(u->slice), SPECIAL_ROOT_SLICE)) {
|
|
r = cg_slice_to_path(UNIT_DEREF(u->slice)->id, &slice);
|
|
if (r < 0)
|
|
return NULL;
|
|
}
|
|
|
|
escaped = cg_escape(u->id);
|
|
if (!escaped)
|
|
return NULL;
|
|
|
|
return path_join(empty_to_root(u->manager->cgroup_root), slice, escaped);
|
|
}
|
|
|
|
int unit_set_cgroup_path(Unit *u, const char *path) {
|
|
_cleanup_free_ char *p = NULL;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
if (streq_ptr(u->cgroup_path, path))
|
|
return 0;
|
|
|
|
if (path) {
|
|
p = strdup(path);
|
|
if (!p)
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (p) {
|
|
r = hashmap_put(u->manager->cgroup_unit, p, u);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
unit_release_cgroup(u);
|
|
u->cgroup_path = TAKE_PTR(p);
|
|
|
|
return 1;
|
|
}
|
|
|
|
int unit_watch_cgroup(Unit *u) {
|
|
_cleanup_free_ char *events = NULL;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
/* Watches the "cgroups.events" attribute of this unit's cgroup for "empty" events, but only if
|
|
* cgroupv2 is available. */
|
|
|
|
if (!u->cgroup_path)
|
|
return 0;
|
|
|
|
if (u->cgroup_control_inotify_wd >= 0)
|
|
return 0;
|
|
|
|
/* Only applies to the unified hierarchy */
|
|
r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine whether the name=systemd hierarchy is unified: %m");
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
/* No point in watch the top-level slice, it's never going to run empty. */
|
|
if (unit_has_name(u, SPECIAL_ROOT_SLICE))
|
|
return 0;
|
|
|
|
r = hashmap_ensure_allocated(&u->manager->cgroup_control_inotify_wd_unit, &trivial_hash_ops);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "cgroup.events", &events);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
u->cgroup_control_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
|
|
if (u->cgroup_control_inotify_wd < 0) {
|
|
|
|
if (errno == ENOENT) /* If the directory is already gone we don't need to track it, so this
|
|
* is not an error */
|
|
return 0;
|
|
|
|
return log_unit_error_errno(u, errno, "Failed to add control inotify watch descriptor for control group %s: %m", u->cgroup_path);
|
|
}
|
|
|
|
r = hashmap_put(u->manager->cgroup_control_inotify_wd_unit, INT_TO_PTR(u->cgroup_control_inotify_wd), u);
|
|
if (r < 0)
|
|
return log_unit_error_errno(u, r, "Failed to add control inotify watch descriptor to hash map: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_watch_cgroup_memory(Unit *u) {
|
|
_cleanup_free_ char *events = NULL;
|
|
CGroupContext *c;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
/* Watches the "memory.events" attribute of this unit's cgroup for "oom_kill" events, but only if
|
|
* cgroupv2 is available. */
|
|
|
|
if (!u->cgroup_path)
|
|
return 0;
|
|
|
|
c = unit_get_cgroup_context(u);
|
|
if (!c)
|
|
return 0;
|
|
|
|
/* The "memory.events" attribute is only available if the memory controller is on. Let's hence tie
|
|
* this to memory accounting, in a way watching for OOM kills is a form of memory accounting after
|
|
* all. */
|
|
if (!c->memory_accounting)
|
|
return 0;
|
|
|
|
/* Don't watch inner nodes, as the kernel doesn't report oom_kill events recursively currently, and
|
|
* we also don't want to generate a log message for each parent cgroup of a process. */
|
|
if (u->type == UNIT_SLICE)
|
|
return 0;
|
|
|
|
if (u->cgroup_memory_inotify_wd >= 0)
|
|
return 0;
|
|
|
|
/* Only applies to the unified hierarchy */
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine whether the memory controller is unified: %m");
|
|
if (r == 0)
|
|
return 0;
|
|
|
|
r = hashmap_ensure_allocated(&u->manager->cgroup_memory_inotify_wd_unit, &trivial_hash_ops);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, "memory.events", &events);
|
|
if (r < 0)
|
|
return log_oom();
|
|
|
|
u->cgroup_memory_inotify_wd = inotify_add_watch(u->manager->cgroup_inotify_fd, events, IN_MODIFY);
|
|
if (u->cgroup_memory_inotify_wd < 0) {
|
|
|
|
if (errno == ENOENT) /* If the directory is already gone we don't need to track it, so this
|
|
* is not an error */
|
|
return 0;
|
|
|
|
return log_unit_error_errno(u, errno, "Failed to add memory inotify watch descriptor for control group %s: %m", u->cgroup_path);
|
|
}
|
|
|
|
r = hashmap_put(u->manager->cgroup_memory_inotify_wd_unit, INT_TO_PTR(u->cgroup_memory_inotify_wd), u);
|
|
if (r < 0)
|
|
return log_unit_error_errno(u, r, "Failed to add memory inotify watch descriptor to hash map: %m");
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_pick_cgroup_path(Unit *u) {
|
|
_cleanup_free_ char *path = NULL;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
if (u->cgroup_path)
|
|
return 0;
|
|
|
|
if (!UNIT_HAS_CGROUP_CONTEXT(u))
|
|
return -EINVAL;
|
|
|
|
path = unit_default_cgroup_path(u);
|
|
if (!path)
|
|
return log_oom();
|
|
|
|
r = unit_set_cgroup_path(u, path);
|
|
if (r == -EEXIST)
|
|
return log_unit_error_errno(u, r, "Control group %s exists already.", path);
|
|
if (r < 0)
|
|
return log_unit_error_errno(u, r, "Failed to set unit's control group path to %s: %m", path);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int unit_create_cgroup(
|
|
Unit *u,
|
|
CGroupMask target_mask,
|
|
CGroupMask enable_mask,
|
|
ManagerState state) {
|
|
|
|
bool created;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
if (!UNIT_HAS_CGROUP_CONTEXT(u))
|
|
return 0;
|
|
|
|
/* Figure out our cgroup path */
|
|
r = unit_pick_cgroup_path(u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* First, create our own group */
|
|
r = cg_create_everywhere(u->manager->cgroup_supported, target_mask, u->cgroup_path);
|
|
if (r < 0)
|
|
return log_unit_error_errno(u, r, "Failed to create cgroup %s: %m", u->cgroup_path);
|
|
created = r;
|
|
|
|
/* Start watching it */
|
|
(void) unit_watch_cgroup(u);
|
|
(void) unit_watch_cgroup_memory(u);
|
|
|
|
/* Preserve enabled controllers in delegated units, adjust others. */
|
|
if (created || !u->cgroup_realized || !unit_cgroup_delegate(u)) {
|
|
CGroupMask result_mask = 0;
|
|
|
|
/* Enable all controllers we need */
|
|
r = cg_enable_everywhere(u->manager->cgroup_supported, enable_mask, u->cgroup_path, &result_mask);
|
|
if (r < 0)
|
|
log_unit_warning_errno(u, r, "Failed to enable/disable controllers on cgroup %s, ignoring: %m", u->cgroup_path);
|
|
|
|
/* If we just turned off a controller, this might release the controller for our parent too, let's
|
|
* enqueue the parent for re-realization in that case again. */
|
|
if (UNIT_ISSET(u->slice)) {
|
|
CGroupMask turned_off;
|
|
|
|
turned_off = (u->cgroup_realized ? u->cgroup_enabled_mask & ~result_mask : 0);
|
|
if (turned_off != 0) {
|
|
Unit *parent;
|
|
|
|
/* Force the parent to propagate the enable mask to the kernel again, by invalidating
|
|
* the controller we just turned off. */
|
|
|
|
for (parent = UNIT_DEREF(u->slice); parent; parent = UNIT_DEREF(parent->slice))
|
|
unit_invalidate_cgroup(parent, turned_off);
|
|
}
|
|
}
|
|
|
|
/* Remember what's actually enabled now */
|
|
u->cgroup_enabled_mask = result_mask;
|
|
}
|
|
|
|
/* Keep track that this is now realized */
|
|
u->cgroup_realized = true;
|
|
u->cgroup_realized_mask = target_mask;
|
|
|
|
if (u->type != UNIT_SLICE && !unit_cgroup_delegate(u)) {
|
|
|
|
/* Then, possibly move things over, but not if
|
|
* subgroups may contain processes, which is the case
|
|
* for slice and delegation units. */
|
|
r = cg_migrate_everywhere(u->manager->cgroup_supported, u->cgroup_path, u->cgroup_path, migrate_callback, u);
|
|
if (r < 0)
|
|
log_unit_warning_errno(u, r, "Failed to migrate cgroup from to %s, ignoring: %m", u->cgroup_path);
|
|
}
|
|
|
|
/* Set attributes */
|
|
cgroup_context_apply(u, target_mask, state);
|
|
cgroup_xattr_apply(u);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int unit_attach_pid_to_cgroup_via_bus(Unit *u, pid_t pid, const char *suffix_path) {
|
|
_cleanup_(sd_bus_error_free) sd_bus_error error = SD_BUS_ERROR_NULL;
|
|
char *pp;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
if (MANAGER_IS_SYSTEM(u->manager))
|
|
return -EINVAL;
|
|
|
|
if (!u->manager->system_bus)
|
|
return -EIO;
|
|
|
|
if (!u->cgroup_path)
|
|
return -EINVAL;
|
|
|
|
/* Determine this unit's cgroup path relative to our cgroup root */
|
|
pp = path_startswith(u->cgroup_path, u->manager->cgroup_root);
|
|
if (!pp)
|
|
return -EINVAL;
|
|
|
|
pp = strjoina("/", pp, suffix_path);
|
|
path_simplify(pp, false);
|
|
|
|
r = sd_bus_call_method(u->manager->system_bus,
|
|
"org.freedesktop.systemd1",
|
|
"/org/freedesktop/systemd1",
|
|
"org.freedesktop.systemd1.Manager",
|
|
"AttachProcessesToUnit",
|
|
&error, NULL,
|
|
"ssau",
|
|
NULL /* empty unit name means client's unit, i.e. us */, pp, 1, (uint32_t) pid);
|
|
if (r < 0)
|
|
return log_unit_debug_errno(u, r, "Failed to attach unit process " PID_FMT " via the bus: %s", pid, bus_error_message(&error, r));
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_attach_pids_to_cgroup(Unit *u, Set *pids, const char *suffix_path) {
|
|
CGroupMask delegated_mask;
|
|
const char *p;
|
|
Iterator i;
|
|
void *pidp;
|
|
int r, q;
|
|
|
|
assert(u);
|
|
|
|
if (!UNIT_HAS_CGROUP_CONTEXT(u))
|
|
return -EINVAL;
|
|
|
|
if (set_isempty(pids))
|
|
return 0;
|
|
|
|
/* Load any custom firewall BPF programs here once to test if they are existing and actually loadable.
|
|
* Fail here early since later errors in the call chain unit_realize_cgroup to cgroup_context_apply are ignored. */
|
|
r = bpf_firewall_load_custom(u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = unit_realize_cgroup(u);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (isempty(suffix_path))
|
|
p = u->cgroup_path;
|
|
else
|
|
p = prefix_roota(u->cgroup_path, suffix_path);
|
|
|
|
delegated_mask = unit_get_delegate_mask(u);
|
|
|
|
r = 0;
|
|
SET_FOREACH(pidp, pids, i) {
|
|
pid_t pid = PTR_TO_PID(pidp);
|
|
CGroupController c;
|
|
|
|
/* First, attach the PID to the main cgroup hierarchy */
|
|
q = cg_attach(SYSTEMD_CGROUP_CONTROLLER, p, pid);
|
|
if (q < 0) {
|
|
log_unit_debug_errno(u, q, "Couldn't move process " PID_FMT " to requested cgroup '%s': %m", pid, p);
|
|
|
|
if (MANAGER_IS_USER(u->manager) && IN_SET(q, -EPERM, -EACCES)) {
|
|
int z;
|
|
|
|
/* If we are in a user instance, and we can't move the process ourselves due to
|
|
* permission problems, let's ask the system instance about it instead. Since it's more
|
|
* privileged it might be able to move the process across the leaves of a subtree who's
|
|
* top node is not owned by us. */
|
|
|
|
z = unit_attach_pid_to_cgroup_via_bus(u, pid, suffix_path);
|
|
if (z < 0)
|
|
log_unit_debug_errno(u, z, "Couldn't move process " PID_FMT " to requested cgroup '%s' via the system bus either: %m", pid, p);
|
|
else
|
|
continue; /* When the bus thing worked via the bus we are fully done for this PID. */
|
|
}
|
|
|
|
if (r >= 0)
|
|
r = q; /* Remember first error */
|
|
|
|
continue;
|
|
}
|
|
|
|
q = cg_all_unified();
|
|
if (q < 0)
|
|
return q;
|
|
if (q > 0)
|
|
continue;
|
|
|
|
/* In the legacy hierarchy, attach the process to the request cgroup if possible, and if not to the
|
|
* innermost realized one */
|
|
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++) {
|
|
CGroupMask bit = CGROUP_CONTROLLER_TO_MASK(c);
|
|
const char *realized;
|
|
|
|
if (!(u->manager->cgroup_supported & bit))
|
|
continue;
|
|
|
|
/* If this controller is delegated and realized, honour the caller's request for the cgroup suffix. */
|
|
if (delegated_mask & u->cgroup_realized_mask & bit) {
|
|
q = cg_attach(cgroup_controller_to_string(c), p, pid);
|
|
if (q >= 0)
|
|
continue; /* Success! */
|
|
|
|
log_unit_debug_errno(u, q, "Failed to attach PID " PID_FMT " to requested cgroup %s in controller %s, falling back to unit's cgroup: %m",
|
|
pid, p, cgroup_controller_to_string(c));
|
|
}
|
|
|
|
/* So this controller is either not delegate or realized, or something else weird happened. In
|
|
* that case let's attach the PID at least to the closest cgroup up the tree that is
|
|
* realized. */
|
|
realized = unit_get_realized_cgroup_path(u, bit);
|
|
if (!realized)
|
|
continue; /* Not even realized in the root slice? Then let's not bother */
|
|
|
|
q = cg_attach(cgroup_controller_to_string(c), realized, pid);
|
|
if (q < 0)
|
|
log_unit_debug_errno(u, q, "Failed to attach PID " PID_FMT " to realized cgroup %s in controller %s, ignoring: %m",
|
|
pid, realized, cgroup_controller_to_string(c));
|
|
}
|
|
}
|
|
|
|
return r;
|
|
}
|
|
|
|
static bool unit_has_mask_realized(
|
|
Unit *u,
|
|
CGroupMask target_mask,
|
|
CGroupMask enable_mask) {
|
|
|
|
assert(u);
|
|
|
|
/* Returns true if this unit is fully realized. We check four things:
|
|
*
|
|
* 1. Whether the cgroup was created at all
|
|
* 2. Whether the cgroup was created in all the hierarchies we need it to be created in (in case of cgroup v1)
|
|
* 3. Whether the cgroup has all the right controllers enabled (in case of cgroup v2)
|
|
* 4. Whether the invalidation mask is currently zero
|
|
*
|
|
* If you wonder why we mask the target realization and enable mask with CGROUP_MASK_V1/CGROUP_MASK_V2: note
|
|
* that there are three sets of bitmasks: CGROUP_MASK_V1 (for real cgroup v1 controllers), CGROUP_MASK_V2 (for
|
|
* real cgroup v2 controllers) and CGROUP_MASK_BPF (for BPF-based pseudo-controllers). Now, cgroup_realized_mask
|
|
* is only matters for cgroup v1 controllers, and cgroup_enabled_mask only used for cgroup v2, and if they
|
|
* differ in the others, we don't really care. (After all, the cgroup_enabled_mask tracks with controllers are
|
|
* enabled through cgroup.subtree_control, and since the BPF pseudo-controllers don't show up there, they
|
|
* simply don't matter. */
|
|
|
|
return u->cgroup_realized &&
|
|
((u->cgroup_realized_mask ^ target_mask) & CGROUP_MASK_V1) == 0 &&
|
|
((u->cgroup_enabled_mask ^ enable_mask) & CGROUP_MASK_V2) == 0 &&
|
|
u->cgroup_invalidated_mask == 0;
|
|
}
|
|
|
|
static bool unit_has_mask_disables_realized(
|
|
Unit *u,
|
|
CGroupMask target_mask,
|
|
CGroupMask enable_mask) {
|
|
|
|
assert(u);
|
|
|
|
/* Returns true if all controllers which should be disabled are indeed disabled.
|
|
*
|
|
* Unlike unit_has_mask_realized, we don't care what was enabled, only that anything we want to remove is
|
|
* already removed. */
|
|
|
|
return !u->cgroup_realized ||
|
|
(FLAGS_SET(u->cgroup_realized_mask, target_mask & CGROUP_MASK_V1) &&
|
|
FLAGS_SET(u->cgroup_enabled_mask, enable_mask & CGROUP_MASK_V2));
|
|
}
|
|
|
|
static bool unit_has_mask_enables_realized(
|
|
Unit *u,
|
|
CGroupMask target_mask,
|
|
CGroupMask enable_mask) {
|
|
|
|
assert(u);
|
|
|
|
/* Returns true if all controllers which should be enabled are indeed enabled.
|
|
*
|
|
* Unlike unit_has_mask_realized, we don't care about the controllers that are not present, only that anything
|
|
* we want to add is already added. */
|
|
|
|
return u->cgroup_realized &&
|
|
((u->cgroup_realized_mask | target_mask) & CGROUP_MASK_V1) == (u->cgroup_realized_mask & CGROUP_MASK_V1) &&
|
|
((u->cgroup_enabled_mask | enable_mask) & CGROUP_MASK_V2) == (u->cgroup_enabled_mask & CGROUP_MASK_V2);
|
|
}
|
|
|
|
void unit_add_to_cgroup_realize_queue(Unit *u) {
|
|
assert(u);
|
|
|
|
if (u->in_cgroup_realize_queue)
|
|
return;
|
|
|
|
LIST_PREPEND(cgroup_realize_queue, u->manager->cgroup_realize_queue, u);
|
|
u->in_cgroup_realize_queue = true;
|
|
}
|
|
|
|
static void unit_remove_from_cgroup_realize_queue(Unit *u) {
|
|
assert(u);
|
|
|
|
if (!u->in_cgroup_realize_queue)
|
|
return;
|
|
|
|
LIST_REMOVE(cgroup_realize_queue, u->manager->cgroup_realize_queue, u);
|
|
u->in_cgroup_realize_queue = false;
|
|
}
|
|
|
|
/* Controllers can only be enabled breadth-first, from the root of the
|
|
* hierarchy downwards to the unit in question. */
|
|
static int unit_realize_cgroup_now_enable(Unit *u, ManagerState state) {
|
|
CGroupMask target_mask, enable_mask, new_target_mask, new_enable_mask;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
/* First go deal with this unit's parent, or we won't be able to enable
|
|
* any new controllers at this layer. */
|
|
if (UNIT_ISSET(u->slice)) {
|
|
r = unit_realize_cgroup_now_enable(UNIT_DEREF(u->slice), state);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
target_mask = unit_get_target_mask(u);
|
|
enable_mask = unit_get_enable_mask(u);
|
|
|
|
/* We can only enable in this direction, don't try to disable anything.
|
|
*/
|
|
if (unit_has_mask_enables_realized(u, target_mask, enable_mask))
|
|
return 0;
|
|
|
|
new_target_mask = u->cgroup_realized_mask | target_mask;
|
|
new_enable_mask = u->cgroup_enabled_mask | enable_mask;
|
|
|
|
return unit_create_cgroup(u, new_target_mask, new_enable_mask, state);
|
|
}
|
|
|
|
/* Controllers can only be disabled depth-first, from the leaves of the
|
|
* hierarchy upwards to the unit in question. */
|
|
static int unit_realize_cgroup_now_disable(Unit *u, ManagerState state) {
|
|
Iterator i;
|
|
Unit *m;
|
|
void *v;
|
|
|
|
assert(u);
|
|
|
|
if (u->type != UNIT_SLICE)
|
|
return 0;
|
|
|
|
HASHMAP_FOREACH_KEY(v, m, u->dependencies[UNIT_BEFORE], i) {
|
|
CGroupMask target_mask, enable_mask, new_target_mask, new_enable_mask;
|
|
int r;
|
|
|
|
if (UNIT_DEREF(m->slice) != u)
|
|
continue;
|
|
|
|
/* The cgroup for this unit might not actually be fully
|
|
* realised yet, in which case it isn't holding any controllers
|
|
* open anyway. */
|
|
if (!m->cgroup_path)
|
|
continue;
|
|
|
|
/* We must disable those below us first in order to release the
|
|
* controller. */
|
|
if (m->type == UNIT_SLICE)
|
|
(void) unit_realize_cgroup_now_disable(m, state);
|
|
|
|
target_mask = unit_get_target_mask(m);
|
|
enable_mask = unit_get_enable_mask(m);
|
|
|
|
/* We can only disable in this direction, don't try to enable
|
|
* anything. */
|
|
if (unit_has_mask_disables_realized(m, target_mask, enable_mask))
|
|
continue;
|
|
|
|
new_target_mask = m->cgroup_realized_mask & target_mask;
|
|
new_enable_mask = m->cgroup_enabled_mask & enable_mask;
|
|
|
|
r = unit_create_cgroup(m, new_target_mask, new_enable_mask, state);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/* Check if necessary controllers and attributes for a unit are in place.
|
|
*
|
|
* - If so, do nothing.
|
|
* - If not, create paths, move processes over, and set attributes.
|
|
*
|
|
* Controllers can only be *enabled* in a breadth-first way, and *disabled* in
|
|
* a depth-first way. As such the process looks like this:
|
|
*
|
|
* Suppose we have a cgroup hierarchy which looks like this:
|
|
*
|
|
* root
|
|
* / \
|
|
* / \
|
|
* / \
|
|
* a b
|
|
* / \ / \
|
|
* / \ / \
|
|
* c d e f
|
|
* / \ / \ / \ / \
|
|
* h i j k l m n o
|
|
*
|
|
* 1. We want to realise cgroup "d" now.
|
|
* 2. cgroup "a" has DisableControllers=cpu in the associated unit.
|
|
* 3. cgroup "k" just started requesting the memory controller.
|
|
*
|
|
* To make this work we must do the following in order:
|
|
*
|
|
* 1. Disable CPU controller in k, j
|
|
* 2. Disable CPU controller in d
|
|
* 3. Enable memory controller in root
|
|
* 4. Enable memory controller in a
|
|
* 5. Enable memory controller in d
|
|
* 6. Enable memory controller in k
|
|
*
|
|
* Notice that we need to touch j in one direction, but not the other. We also
|
|
* don't go beyond d when disabling -- it's up to "a" to get realized if it
|
|
* wants to disable further. The basic rules are therefore:
|
|
*
|
|
* - If you're disabling something, you need to realise all of the cgroups from
|
|
* your recursive descendants to the root. This starts from the leaves.
|
|
* - If you're enabling something, you need to realise from the root cgroup
|
|
* downwards, but you don't need to iterate your recursive descendants.
|
|
*
|
|
* Returns 0 on success and < 0 on failure. */
|
|
static int unit_realize_cgroup_now(Unit *u, ManagerState state) {
|
|
CGroupMask target_mask, enable_mask;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
unit_remove_from_cgroup_realize_queue(u);
|
|
|
|
target_mask = unit_get_target_mask(u);
|
|
enable_mask = unit_get_enable_mask(u);
|
|
|
|
if (unit_has_mask_realized(u, target_mask, enable_mask))
|
|
return 0;
|
|
|
|
/* Disable controllers below us, if there are any */
|
|
r = unit_realize_cgroup_now_disable(u, state);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Enable controllers above us, if there are any */
|
|
if (UNIT_ISSET(u->slice)) {
|
|
r = unit_realize_cgroup_now_enable(UNIT_DEREF(u->slice), state);
|
|
if (r < 0)
|
|
return r;
|
|
}
|
|
|
|
/* Now actually deal with the cgroup we were trying to realise and set attributes */
|
|
r = unit_create_cgroup(u, target_mask, enable_mask, state);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Now, reset the invalidation mask */
|
|
u->cgroup_invalidated_mask = 0;
|
|
return 0;
|
|
}
|
|
|
|
unsigned manager_dispatch_cgroup_realize_queue(Manager *m) {
|
|
ManagerState state;
|
|
unsigned n = 0;
|
|
Unit *i;
|
|
int r;
|
|
|
|
assert(m);
|
|
|
|
state = manager_state(m);
|
|
|
|
while ((i = m->cgroup_realize_queue)) {
|
|
assert(i->in_cgroup_realize_queue);
|
|
|
|
if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(i))) {
|
|
/* Maybe things changed, and the unit is not actually active anymore? */
|
|
unit_remove_from_cgroup_realize_queue(i);
|
|
continue;
|
|
}
|
|
|
|
r = unit_realize_cgroup_now(i, state);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to realize cgroups for queued unit %s, ignoring: %m", i->id);
|
|
|
|
n++;
|
|
}
|
|
|
|
return n;
|
|
}
|
|
|
|
static void unit_add_siblings_to_cgroup_realize_queue(Unit *u) {
|
|
Unit *slice;
|
|
|
|
/* This adds the siblings of the specified unit and the siblings of all parent units to the cgroup
|
|
* queue. (But neither the specified unit itself nor the parents.)
|
|
*
|
|
* Propagation of realization "side-ways" (i.e. towards siblings) is relevant on cgroup-v1 where
|
|
* scheduling becomes very weird if two units that own processes reside in the same slice, but one is
|
|
* realized in the "cpu" hierarchy and one is not (for example because one has CPUWeight= set and the
|
|
* other does not), because that means individual processes need to be scheduled against whole
|
|
* cgroups. Let's avoid this asymmetry by always ensuring that units below a slice that are realized
|
|
* at all are always realized in *all* their hierarchies, and it is sufficient for a unit's sibling
|
|
* to be realized for the unit itself to be realized too. */
|
|
|
|
while ((slice = UNIT_DEREF(u->slice))) {
|
|
Iterator i;
|
|
Unit *m;
|
|
void *v;
|
|
|
|
HASHMAP_FOREACH_KEY(v, m, slice->dependencies[UNIT_BEFORE], i) {
|
|
|
|
/* Skip units that have a dependency on the slice but aren't actually in it. */
|
|
if (UNIT_DEREF(m->slice) != slice)
|
|
continue;
|
|
|
|
/* No point in doing cgroup application for units without active processes. */
|
|
if (UNIT_IS_INACTIVE_OR_FAILED(unit_active_state(m)))
|
|
continue;
|
|
|
|
/* We only enqueue siblings if they were realized once at least, in the main
|
|
* hierarchy. */
|
|
if (!m->cgroup_realized)
|
|
continue;
|
|
|
|
/* If the unit doesn't need any new controllers and has current ones realized, it
|
|
* doesn't need any changes. */
|
|
if (unit_has_mask_realized(m,
|
|
unit_get_target_mask(m),
|
|
unit_get_enable_mask(m)))
|
|
continue;
|
|
|
|
unit_add_to_cgroup_realize_queue(m);
|
|
}
|
|
|
|
u = slice;
|
|
}
|
|
}
|
|
|
|
int unit_realize_cgroup(Unit *u) {
|
|
assert(u);
|
|
|
|
if (!UNIT_HAS_CGROUP_CONTEXT(u))
|
|
return 0;
|
|
|
|
/* So, here's the deal: when realizing the cgroups for this
|
|
* unit, we need to first create all parents, but there's more
|
|
* actually: for the weight-based controllers we also need to
|
|
* make sure that all our siblings (i.e. units that are in the
|
|
* same slice as we are) have cgroups, too. Otherwise, things
|
|
* would become very uneven as each of their processes would
|
|
* get as much resources as all our group together. This call
|
|
* will synchronously create the parent cgroups, but will
|
|
* defer work on the siblings to the next event loop
|
|
* iteration. */
|
|
|
|
/* Add all sibling slices to the cgroup queue. */
|
|
unit_add_siblings_to_cgroup_realize_queue(u);
|
|
|
|
/* And realize this one now (and apply the values) */
|
|
return unit_realize_cgroup_now(u, manager_state(u->manager));
|
|
}
|
|
|
|
void unit_release_cgroup(Unit *u) {
|
|
assert(u);
|
|
|
|
/* Forgets all cgroup details for this cgroup — but does *not* destroy the cgroup. This is hence OK to call
|
|
* when we close down everything for reexecution, where we really want to leave the cgroup in place. */
|
|
|
|
if (u->cgroup_path) {
|
|
(void) hashmap_remove(u->manager->cgroup_unit, u->cgroup_path);
|
|
u->cgroup_path = mfree(u->cgroup_path);
|
|
}
|
|
|
|
if (u->cgroup_control_inotify_wd >= 0) {
|
|
if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_control_inotify_wd) < 0)
|
|
log_unit_debug_errno(u, errno, "Failed to remove cgroup control inotify watch %i for %s, ignoring: %m", u->cgroup_control_inotify_wd, u->id);
|
|
|
|
(void) hashmap_remove(u->manager->cgroup_control_inotify_wd_unit, INT_TO_PTR(u->cgroup_control_inotify_wd));
|
|
u->cgroup_control_inotify_wd = -1;
|
|
}
|
|
|
|
if (u->cgroup_memory_inotify_wd >= 0) {
|
|
if (inotify_rm_watch(u->manager->cgroup_inotify_fd, u->cgroup_memory_inotify_wd) < 0)
|
|
log_unit_debug_errno(u, errno, "Failed to remove cgroup memory inotify watch %i for %s, ignoring: %m", u->cgroup_memory_inotify_wd, u->id);
|
|
|
|
(void) hashmap_remove(u->manager->cgroup_memory_inotify_wd_unit, INT_TO_PTR(u->cgroup_memory_inotify_wd));
|
|
u->cgroup_memory_inotify_wd = -1;
|
|
}
|
|
}
|
|
|
|
void unit_prune_cgroup(Unit *u) {
|
|
int r;
|
|
bool is_root_slice;
|
|
|
|
assert(u);
|
|
|
|
/* Removes the cgroup, if empty and possible, and stops watching it. */
|
|
|
|
if (!u->cgroup_path)
|
|
return;
|
|
|
|
(void) unit_get_cpu_usage(u, NULL); /* Cache the last CPU usage value before we destroy the cgroup */
|
|
|
|
is_root_slice = unit_has_name(u, SPECIAL_ROOT_SLICE);
|
|
|
|
r = cg_trim_everywhere(u->manager->cgroup_supported, u->cgroup_path, !is_root_slice);
|
|
if (r < 0)
|
|
/* One reason we could have failed here is, that the cgroup still contains a process.
|
|
* However, if the cgroup becomes removable at a later time, it might be removed when
|
|
* the containing slice is stopped. So even if we failed now, this unit shouldn't assume
|
|
* that the cgroup is still realized the next time it is started. Do not return early
|
|
* on error, continue cleanup. */
|
|
log_unit_full(u, r == -EBUSY ? LOG_DEBUG : LOG_WARNING, r, "Failed to destroy cgroup %s, ignoring: %m", u->cgroup_path);
|
|
|
|
if (is_root_slice)
|
|
return;
|
|
|
|
unit_release_cgroup(u);
|
|
|
|
u->cgroup_realized = false;
|
|
u->cgroup_realized_mask = 0;
|
|
u->cgroup_enabled_mask = 0;
|
|
|
|
u->bpf_device_control_installed = bpf_program_unref(u->bpf_device_control_installed);
|
|
}
|
|
|
|
int unit_search_main_pid(Unit *u, pid_t *ret) {
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
pid_t pid = 0, npid;
|
|
int r;
|
|
|
|
assert(u);
|
|
assert(ret);
|
|
|
|
if (!u->cgroup_path)
|
|
return -ENXIO;
|
|
|
|
r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path, &f);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
while (cg_read_pid(f, &npid) > 0) {
|
|
|
|
if (npid == pid)
|
|
continue;
|
|
|
|
if (pid_is_my_child(npid) == 0)
|
|
continue;
|
|
|
|
if (pid != 0)
|
|
/* Dang, there's more than one daemonized PID
|
|
in this group, so we don't know what process
|
|
is the main process. */
|
|
|
|
return -ENODATA;
|
|
|
|
pid = npid;
|
|
}
|
|
|
|
*ret = pid;
|
|
return 0;
|
|
}
|
|
|
|
static int unit_watch_pids_in_path(Unit *u, const char *path) {
|
|
_cleanup_closedir_ DIR *d = NULL;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
int ret = 0, r;
|
|
|
|
assert(u);
|
|
assert(path);
|
|
|
|
r = cg_enumerate_processes(SYSTEMD_CGROUP_CONTROLLER, path, &f);
|
|
if (r < 0)
|
|
ret = r;
|
|
else {
|
|
pid_t pid;
|
|
|
|
while ((r = cg_read_pid(f, &pid)) > 0) {
|
|
r = unit_watch_pid(u, pid, false);
|
|
if (r < 0 && ret >= 0)
|
|
ret = r;
|
|
}
|
|
|
|
if (r < 0 && ret >= 0)
|
|
ret = r;
|
|
}
|
|
|
|
r = cg_enumerate_subgroups(SYSTEMD_CGROUP_CONTROLLER, path, &d);
|
|
if (r < 0) {
|
|
if (ret >= 0)
|
|
ret = r;
|
|
} else {
|
|
char *fn;
|
|
|
|
while ((r = cg_read_subgroup(d, &fn)) > 0) {
|
|
_cleanup_free_ char *p = NULL;
|
|
|
|
p = path_join(empty_to_root(path), fn);
|
|
free(fn);
|
|
|
|
if (!p)
|
|
return -ENOMEM;
|
|
|
|
r = unit_watch_pids_in_path(u, p);
|
|
if (r < 0 && ret >= 0)
|
|
ret = r;
|
|
}
|
|
|
|
if (r < 0 && ret >= 0)
|
|
ret = r;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int unit_synthesize_cgroup_empty_event(Unit *u) {
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
/* Enqueue a synthetic cgroup empty event if this unit doesn't watch any PIDs anymore. This is compatibility
|
|
* support for non-unified systems where notifications aren't reliable, and hence need to take whatever we can
|
|
* get as notification source as soon as we stopped having any useful PIDs to watch for. */
|
|
|
|
if (!u->cgroup_path)
|
|
return -ENOENT;
|
|
|
|
r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) /* On unified we have reliable notifications, and don't need this */
|
|
return 0;
|
|
|
|
if (!set_isempty(u->pids))
|
|
return 0;
|
|
|
|
unit_add_to_cgroup_empty_queue(u);
|
|
return 0;
|
|
}
|
|
|
|
int unit_watch_all_pids(Unit *u) {
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
/* Adds all PIDs from our cgroup to the set of PIDs we
|
|
* watch. This is a fallback logic for cases where we do not
|
|
* get reliable cgroup empty notifications: we try to use
|
|
* SIGCHLD as replacement. */
|
|
|
|
if (!u->cgroup_path)
|
|
return -ENOENT;
|
|
|
|
r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) /* On unified we can use proper notifications */
|
|
return 0;
|
|
|
|
return unit_watch_pids_in_path(u, u->cgroup_path);
|
|
}
|
|
|
|
static int on_cgroup_empty_event(sd_event_source *s, void *userdata) {
|
|
Manager *m = userdata;
|
|
Unit *u;
|
|
int r;
|
|
|
|
assert(s);
|
|
assert(m);
|
|
|
|
u = m->cgroup_empty_queue;
|
|
if (!u)
|
|
return 0;
|
|
|
|
assert(u->in_cgroup_empty_queue);
|
|
u->in_cgroup_empty_queue = false;
|
|
LIST_REMOVE(cgroup_empty_queue, m->cgroup_empty_queue, u);
|
|
|
|
if (m->cgroup_empty_queue) {
|
|
/* More stuff queued, let's make sure we remain enabled */
|
|
r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to reenable cgroup empty event source, ignoring: %m");
|
|
}
|
|
|
|
unit_add_to_gc_queue(u);
|
|
|
|
if (UNIT_VTABLE(u)->notify_cgroup_empty)
|
|
UNIT_VTABLE(u)->notify_cgroup_empty(u);
|
|
|
|
return 0;
|
|
}
|
|
|
|
void unit_add_to_cgroup_empty_queue(Unit *u) {
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
/* Note that there are four different ways how cgroup empty events reach us:
|
|
*
|
|
* 1. On the unified hierarchy we get an inotify event on the cgroup
|
|
*
|
|
* 2. On the legacy hierarchy, when running in system mode, we get a datagram on the cgroup agent socket
|
|
*
|
|
* 3. On the legacy hierarchy, when running in user mode, we get a D-Bus signal on the system bus
|
|
*
|
|
* 4. On the legacy hierarchy, in service units we start watching all processes of the cgroup for SIGCHLD as
|
|
* soon as we get one SIGCHLD, to deal with unreliable cgroup notifications.
|
|
*
|
|
* Regardless which way we got the notification, we'll verify it here, and then add it to a separate
|
|
* queue. This queue will be dispatched at a lower priority than the SIGCHLD handler, so that we always use
|
|
* SIGCHLD if we can get it first, and only use the cgroup empty notifications if there's no SIGCHLD pending
|
|
* (which might happen if the cgroup doesn't contain processes that are our own child, which is typically the
|
|
* case for scope units). */
|
|
|
|
if (u->in_cgroup_empty_queue)
|
|
return;
|
|
|
|
/* Let's verify that the cgroup is really empty */
|
|
if (!u->cgroup_path)
|
|
return;
|
|
|
|
r = cg_is_empty_recursive(SYSTEMD_CGROUP_CONTROLLER, u->cgroup_path);
|
|
if (r < 0) {
|
|
log_unit_debug_errno(u, r, "Failed to determine whether cgroup %s is empty: %m", u->cgroup_path);
|
|
return;
|
|
}
|
|
if (r == 0)
|
|
return;
|
|
|
|
LIST_PREPEND(cgroup_empty_queue, u->manager->cgroup_empty_queue, u);
|
|
u->in_cgroup_empty_queue = true;
|
|
|
|
/* Trigger the defer event */
|
|
r = sd_event_source_set_enabled(u->manager->cgroup_empty_event_source, SD_EVENT_ONESHOT);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to enable cgroup empty event source: %m");
|
|
}
|
|
|
|
int unit_check_oom(Unit *u) {
|
|
_cleanup_free_ char *oom_kill = NULL;
|
|
bool increased;
|
|
uint64_t c;
|
|
int r;
|
|
|
|
if (!u->cgroup_path)
|
|
return 0;
|
|
|
|
r = cg_get_keyed_attribute("memory", u->cgroup_path, "memory.events", STRV_MAKE("oom_kill"), &oom_kill);
|
|
if (r < 0)
|
|
return log_unit_debug_errno(u, r, "Failed to read oom_kill field of memory.events cgroup attribute: %m");
|
|
|
|
r = safe_atou64(oom_kill, &c);
|
|
if (r < 0)
|
|
return log_unit_debug_errno(u, r, "Failed to parse oom_kill field: %m");
|
|
|
|
increased = c > u->oom_kill_last;
|
|
u->oom_kill_last = c;
|
|
|
|
if (!increased)
|
|
return 0;
|
|
|
|
log_struct(LOG_NOTICE,
|
|
"MESSAGE_ID=" SD_MESSAGE_UNIT_OUT_OF_MEMORY_STR,
|
|
LOG_UNIT_ID(u),
|
|
LOG_UNIT_INVOCATION_ID(u),
|
|
LOG_UNIT_MESSAGE(u, "A process of this unit has been killed by the OOM killer."));
|
|
|
|
if (UNIT_VTABLE(u)->notify_cgroup_oom)
|
|
UNIT_VTABLE(u)->notify_cgroup_oom(u);
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int on_cgroup_oom_event(sd_event_source *s, void *userdata) {
|
|
Manager *m = userdata;
|
|
Unit *u;
|
|
int r;
|
|
|
|
assert(s);
|
|
assert(m);
|
|
|
|
u = m->cgroup_oom_queue;
|
|
if (!u)
|
|
return 0;
|
|
|
|
assert(u->in_cgroup_oom_queue);
|
|
u->in_cgroup_oom_queue = false;
|
|
LIST_REMOVE(cgroup_oom_queue, m->cgroup_oom_queue, u);
|
|
|
|
if (m->cgroup_oom_queue) {
|
|
/* More stuff queued, let's make sure we remain enabled */
|
|
r = sd_event_source_set_enabled(s, SD_EVENT_ONESHOT);
|
|
if (r < 0)
|
|
log_debug_errno(r, "Failed to reenable cgroup oom event source, ignoring: %m");
|
|
}
|
|
|
|
(void) unit_check_oom(u);
|
|
return 0;
|
|
}
|
|
|
|
static void unit_add_to_cgroup_oom_queue(Unit *u) {
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
if (u->in_cgroup_oom_queue)
|
|
return;
|
|
if (!u->cgroup_path)
|
|
return;
|
|
|
|
LIST_PREPEND(cgroup_oom_queue, u->manager->cgroup_oom_queue, u);
|
|
u->in_cgroup_oom_queue = true;
|
|
|
|
/* Trigger the defer event */
|
|
if (!u->manager->cgroup_oom_event_source) {
|
|
_cleanup_(sd_event_source_unrefp) sd_event_source *s = NULL;
|
|
|
|
r = sd_event_add_defer(u->manager->event, &s, on_cgroup_oom_event, u->manager);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to create cgroup oom event source: %m");
|
|
return;
|
|
}
|
|
|
|
r = sd_event_source_set_priority(s, SD_EVENT_PRIORITY_NORMAL-8);
|
|
if (r < 0) {
|
|
log_error_errno(r, "Failed to set priority of cgroup oom event source: %m");
|
|
return;
|
|
}
|
|
|
|
(void) sd_event_source_set_description(s, "cgroup-oom");
|
|
u->manager->cgroup_oom_event_source = TAKE_PTR(s);
|
|
}
|
|
|
|
r = sd_event_source_set_enabled(u->manager->cgroup_oom_event_source, SD_EVENT_ONESHOT);
|
|
if (r < 0)
|
|
log_error_errno(r, "Failed to enable cgroup oom event source: %m");
|
|
}
|
|
|
|
static int on_cgroup_inotify_event(sd_event_source *s, int fd, uint32_t revents, void *userdata) {
|
|
Manager *m = userdata;
|
|
|
|
assert(s);
|
|
assert(fd >= 0);
|
|
assert(m);
|
|
|
|
for (;;) {
|
|
union inotify_event_buffer buffer;
|
|
struct inotify_event *e;
|
|
ssize_t l;
|
|
|
|
l = read(fd, &buffer, sizeof(buffer));
|
|
if (l < 0) {
|
|
if (IN_SET(errno, EINTR, EAGAIN))
|
|
return 0;
|
|
|
|
return log_error_errno(errno, "Failed to read control group inotify events: %m");
|
|
}
|
|
|
|
FOREACH_INOTIFY_EVENT(e, buffer, l) {
|
|
Unit *u;
|
|
|
|
if (e->wd < 0)
|
|
/* Queue overflow has no watch descriptor */
|
|
continue;
|
|
|
|
if (e->mask & IN_IGNORED)
|
|
/* The watch was just removed */
|
|
continue;
|
|
|
|
/* Note that inotify might deliver events for a watch even after it was removed,
|
|
* because it was queued before the removal. Let's ignore this here safely. */
|
|
|
|
u = hashmap_get(m->cgroup_control_inotify_wd_unit, INT_TO_PTR(e->wd));
|
|
if (u)
|
|
unit_add_to_cgroup_empty_queue(u);
|
|
|
|
u = hashmap_get(m->cgroup_memory_inotify_wd_unit, INT_TO_PTR(e->wd));
|
|
if (u)
|
|
unit_add_to_cgroup_oom_queue(u);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int cg_bpf_mask_supported(CGroupMask *ret) {
|
|
CGroupMask mask = 0;
|
|
int r;
|
|
|
|
/* BPF-based firewall */
|
|
r = bpf_firewall_supported();
|
|
if (r > 0)
|
|
mask |= CGROUP_MASK_BPF_FIREWALL;
|
|
|
|
/* BPF-based device access control */
|
|
r = bpf_devices_supported();
|
|
if (r > 0)
|
|
mask |= CGROUP_MASK_BPF_DEVICES;
|
|
|
|
*ret = mask;
|
|
return 0;
|
|
}
|
|
|
|
int manager_setup_cgroup(Manager *m) {
|
|
_cleanup_free_ char *path = NULL;
|
|
const char *scope_path;
|
|
CGroupController c;
|
|
int r, all_unified;
|
|
CGroupMask mask;
|
|
char *e;
|
|
|
|
assert(m);
|
|
|
|
/* 1. Determine hierarchy */
|
|
m->cgroup_root = mfree(m->cgroup_root);
|
|
r = cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, 0, &m->cgroup_root);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Cannot determine cgroup we are running in: %m");
|
|
|
|
/* Chop off the init scope, if we are already located in it */
|
|
e = endswith(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
|
|
|
|
/* LEGACY: Also chop off the system slice if we are in
|
|
* it. This is to support live upgrades from older systemd
|
|
* versions where PID 1 was moved there. Also see
|
|
* cg_get_root_path(). */
|
|
if (!e && MANAGER_IS_SYSTEM(m)) {
|
|
e = endswith(m->cgroup_root, "/" SPECIAL_SYSTEM_SLICE);
|
|
if (!e)
|
|
e = endswith(m->cgroup_root, "/system"); /* even more legacy */
|
|
}
|
|
if (e)
|
|
*e = 0;
|
|
|
|
/* And make sure to store away the root value without trailing slash, even for the root dir, so that we can
|
|
* easily prepend it everywhere. */
|
|
delete_trailing_chars(m->cgroup_root, "/");
|
|
|
|
/* 2. Show data */
|
|
r = cg_get_path(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, NULL, &path);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Cannot find cgroup mount point: %m");
|
|
|
|
r = cg_unified();
|
|
if (r < 0)
|
|
return log_error_errno(r, "Couldn't determine if we are running in the unified hierarchy: %m");
|
|
|
|
all_unified = cg_all_unified();
|
|
if (all_unified < 0)
|
|
return log_error_errno(all_unified, "Couldn't determine whether we are in all unified mode: %m");
|
|
if (all_unified > 0)
|
|
log_debug("Unified cgroup hierarchy is located at %s.", path);
|
|
else {
|
|
r = cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine whether systemd's own controller is in unified mode: %m");
|
|
if (r > 0)
|
|
log_debug("Unified cgroup hierarchy is located at %s. Controllers are on legacy hierarchies.", path);
|
|
else
|
|
log_debug("Using cgroup controller " SYSTEMD_CGROUP_CONTROLLER_LEGACY ". File system hierarchy is at %s.", path);
|
|
}
|
|
|
|
/* 3. Allocate cgroup empty defer event source */
|
|
m->cgroup_empty_event_source = sd_event_source_unref(m->cgroup_empty_event_source);
|
|
r = sd_event_add_defer(m->event, &m->cgroup_empty_event_source, on_cgroup_empty_event, m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to create cgroup empty event source: %m");
|
|
|
|
/* Schedule cgroup empty checks early, but after having processed service notification messages or
|
|
* SIGCHLD signals, so that a cgroup running empty is always just the last safety net of
|
|
* notification, and we collected the metadata the notification and SIGCHLD stuff offers first. */
|
|
r = sd_event_source_set_priority(m->cgroup_empty_event_source, SD_EVENT_PRIORITY_NORMAL-5);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to set priority of cgroup empty event source: %m");
|
|
|
|
r = sd_event_source_set_enabled(m->cgroup_empty_event_source, SD_EVENT_OFF);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to disable cgroup empty event source: %m");
|
|
|
|
(void) sd_event_source_set_description(m->cgroup_empty_event_source, "cgroup-empty");
|
|
|
|
/* 4. Install notifier inotify object, or agent */
|
|
if (cg_unified_controller(SYSTEMD_CGROUP_CONTROLLER) > 0) {
|
|
|
|
/* In the unified hierarchy we can get cgroup empty notifications via inotify. */
|
|
|
|
m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
|
|
safe_close(m->cgroup_inotify_fd);
|
|
|
|
m->cgroup_inotify_fd = inotify_init1(IN_NONBLOCK|IN_CLOEXEC);
|
|
if (m->cgroup_inotify_fd < 0)
|
|
return log_error_errno(errno, "Failed to create control group inotify object: %m");
|
|
|
|
r = sd_event_add_io(m->event, &m->cgroup_inotify_event_source, m->cgroup_inotify_fd, EPOLLIN, on_cgroup_inotify_event, m);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to watch control group inotify object: %m");
|
|
|
|
/* Process cgroup empty notifications early. Note that when this event is dispatched it'll
|
|
* just add the unit to a cgroup empty queue, hence let's run earlier than that. Also see
|
|
* handling of cgroup agent notifications, for the classic cgroup hierarchy support. */
|
|
r = sd_event_source_set_priority(m->cgroup_inotify_event_source, SD_EVENT_PRIORITY_NORMAL-9);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to set priority of inotify event source: %m");
|
|
|
|
(void) sd_event_source_set_description(m->cgroup_inotify_event_source, "cgroup-inotify");
|
|
|
|
} else if (MANAGER_IS_SYSTEM(m) && manager_owns_host_root_cgroup(m) && !MANAGER_IS_TEST_RUN(m)) {
|
|
|
|
/* On the legacy hierarchy we only get notifications via cgroup agents. (Which isn't really reliable,
|
|
* since it does not generate events when control groups with children run empty. */
|
|
|
|
r = cg_install_release_agent(SYSTEMD_CGROUP_CONTROLLER, SYSTEMD_CGROUP_AGENT_PATH);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Failed to install release agent, ignoring: %m");
|
|
else if (r > 0)
|
|
log_debug("Installed release agent.");
|
|
else if (r == 0)
|
|
log_debug("Release agent already installed.");
|
|
}
|
|
|
|
/* 5. Make sure we are in the special "init.scope" unit in the root slice. */
|
|
scope_path = strjoina(m->cgroup_root, "/" SPECIAL_INIT_SCOPE);
|
|
r = cg_create_and_attach(SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
|
|
if (r >= 0) {
|
|
/* Also, move all other userspace processes remaining in the root cgroup into that scope. */
|
|
r = cg_migrate(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, SYSTEMD_CGROUP_CONTROLLER, scope_path, 0);
|
|
if (r < 0)
|
|
log_warning_errno(r, "Couldn't move remaining userspace processes, ignoring: %m");
|
|
|
|
/* 6. And pin it, so that it cannot be unmounted */
|
|
safe_close(m->pin_cgroupfs_fd);
|
|
m->pin_cgroupfs_fd = open(path, O_RDONLY|O_CLOEXEC|O_DIRECTORY|O_NOCTTY|O_NONBLOCK);
|
|
if (m->pin_cgroupfs_fd < 0)
|
|
return log_error_errno(errno, "Failed to open pin file: %m");
|
|
|
|
} else if (!MANAGER_IS_TEST_RUN(m))
|
|
return log_error_errno(r, "Failed to create %s control group: %m", scope_path);
|
|
|
|
/* 7. Always enable hierarchical support if it exists... */
|
|
if (!all_unified && !MANAGER_IS_TEST_RUN(m))
|
|
(void) cg_set_attribute("memory", "/", "memory.use_hierarchy", "1");
|
|
|
|
/* 8. Figure out which controllers are supported */
|
|
r = cg_mask_supported(&m->cgroup_supported);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine supported controllers: %m");
|
|
|
|
/* 9. Figure out which bpf-based pseudo-controllers are supported */
|
|
r = cg_bpf_mask_supported(&mask);
|
|
if (r < 0)
|
|
return log_error_errno(r, "Failed to determine supported bpf-based pseudo-controllers: %m");
|
|
m->cgroup_supported |= mask;
|
|
|
|
/* 10. Log which controllers are supported */
|
|
for (c = 0; c < _CGROUP_CONTROLLER_MAX; c++)
|
|
log_debug("Controller '%s' supported: %s", cgroup_controller_to_string(c), yes_no(m->cgroup_supported & CGROUP_CONTROLLER_TO_MASK(c)));
|
|
|
|
return 0;
|
|
}
|
|
|
|
void manager_shutdown_cgroup(Manager *m, bool delete) {
|
|
assert(m);
|
|
|
|
/* We can't really delete the group, since we are in it. But
|
|
* let's trim it. */
|
|
if (delete && m->cgroup_root && m->test_run_flags != MANAGER_TEST_RUN_MINIMAL)
|
|
(void) cg_trim(SYSTEMD_CGROUP_CONTROLLER, m->cgroup_root, false);
|
|
|
|
m->cgroup_empty_event_source = sd_event_source_unref(m->cgroup_empty_event_source);
|
|
|
|
m->cgroup_control_inotify_wd_unit = hashmap_free(m->cgroup_control_inotify_wd_unit);
|
|
m->cgroup_memory_inotify_wd_unit = hashmap_free(m->cgroup_memory_inotify_wd_unit);
|
|
|
|
m->cgroup_inotify_event_source = sd_event_source_unref(m->cgroup_inotify_event_source);
|
|
m->cgroup_inotify_fd = safe_close(m->cgroup_inotify_fd);
|
|
|
|
m->pin_cgroupfs_fd = safe_close(m->pin_cgroupfs_fd);
|
|
|
|
m->cgroup_root = mfree(m->cgroup_root);
|
|
}
|
|
|
|
Unit* manager_get_unit_by_cgroup(Manager *m, const char *cgroup) {
|
|
char *p;
|
|
Unit *u;
|
|
|
|
assert(m);
|
|
assert(cgroup);
|
|
|
|
u = hashmap_get(m->cgroup_unit, cgroup);
|
|
if (u)
|
|
return u;
|
|
|
|
p = strdupa(cgroup);
|
|
for (;;) {
|
|
char *e;
|
|
|
|
e = strrchr(p, '/');
|
|
if (!e || e == p)
|
|
return hashmap_get(m->cgroup_unit, SPECIAL_ROOT_SLICE);
|
|
|
|
*e = 0;
|
|
|
|
u = hashmap_get(m->cgroup_unit, p);
|
|
if (u)
|
|
return u;
|
|
}
|
|
}
|
|
|
|
Unit *manager_get_unit_by_pid_cgroup(Manager *m, pid_t pid) {
|
|
_cleanup_free_ char *cgroup = NULL;
|
|
|
|
assert(m);
|
|
|
|
if (!pid_is_valid(pid))
|
|
return NULL;
|
|
|
|
if (cg_pid_get_path(SYSTEMD_CGROUP_CONTROLLER, pid, &cgroup) < 0)
|
|
return NULL;
|
|
|
|
return manager_get_unit_by_cgroup(m, cgroup);
|
|
}
|
|
|
|
Unit *manager_get_unit_by_pid(Manager *m, pid_t pid) {
|
|
Unit *u, **array;
|
|
|
|
assert(m);
|
|
|
|
/* Note that a process might be owned by multiple units, we return only one here, which is good enough for most
|
|
* cases, though not strictly correct. We prefer the one reported by cgroup membership, as that's the most
|
|
* relevant one as children of the process will be assigned to that one, too, before all else. */
|
|
|
|
if (!pid_is_valid(pid))
|
|
return NULL;
|
|
|
|
if (pid == getpid_cached())
|
|
return hashmap_get(m->units, SPECIAL_INIT_SCOPE);
|
|
|
|
u = manager_get_unit_by_pid_cgroup(m, pid);
|
|
if (u)
|
|
return u;
|
|
|
|
u = hashmap_get(m->watch_pids, PID_TO_PTR(pid));
|
|
if (u)
|
|
return u;
|
|
|
|
array = hashmap_get(m->watch_pids, PID_TO_PTR(-pid));
|
|
if (array)
|
|
return array[0];
|
|
|
|
return NULL;
|
|
}
|
|
|
|
int manager_notify_cgroup_empty(Manager *m, const char *cgroup) {
|
|
Unit *u;
|
|
|
|
assert(m);
|
|
assert(cgroup);
|
|
|
|
/* Called on the legacy hierarchy whenever we get an explicit cgroup notification from the cgroup agent process
|
|
* or from the --system instance */
|
|
|
|
log_debug("Got cgroup empty notification for: %s", cgroup);
|
|
|
|
u = manager_get_unit_by_cgroup(m, cgroup);
|
|
if (!u)
|
|
return 0;
|
|
|
|
unit_add_to_cgroup_empty_queue(u);
|
|
return 1;
|
|
}
|
|
|
|
int unit_get_memory_current(Unit *u, uint64_t *ret) {
|
|
int r;
|
|
|
|
assert(u);
|
|
assert(ret);
|
|
|
|
if (!UNIT_CGROUP_BOOL(u, memory_accounting))
|
|
return -ENODATA;
|
|
|
|
if (!u->cgroup_path)
|
|
return -ENODATA;
|
|
|
|
/* The root cgroup doesn't expose this information, let's get it from /proc instead */
|
|
if (unit_has_host_root_cgroup(u))
|
|
return procfs_memory_get_used(ret);
|
|
|
|
if ((u->cgroup_realized_mask & CGROUP_MASK_MEMORY) == 0)
|
|
return -ENODATA;
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return cg_get_attribute_as_uint64("memory", u->cgroup_path, r > 0 ? "memory.current" : "memory.usage_in_bytes", ret);
|
|
}
|
|
|
|
int unit_get_tasks_current(Unit *u, uint64_t *ret) {
|
|
assert(u);
|
|
assert(ret);
|
|
|
|
if (!UNIT_CGROUP_BOOL(u, tasks_accounting))
|
|
return -ENODATA;
|
|
|
|
if (!u->cgroup_path)
|
|
return -ENODATA;
|
|
|
|
/* The root cgroup doesn't expose this information, let's get it from /proc instead */
|
|
if (unit_has_host_root_cgroup(u))
|
|
return procfs_tasks_get_current(ret);
|
|
|
|
if ((u->cgroup_realized_mask & CGROUP_MASK_PIDS) == 0)
|
|
return -ENODATA;
|
|
|
|
return cg_get_attribute_as_uint64("pids", u->cgroup_path, "pids.current", ret);
|
|
}
|
|
|
|
static int unit_get_cpu_usage_raw(Unit *u, nsec_t *ret) {
|
|
uint64_t ns;
|
|
int r;
|
|
|
|
assert(u);
|
|
assert(ret);
|
|
|
|
if (!u->cgroup_path)
|
|
return -ENODATA;
|
|
|
|
/* The root cgroup doesn't expose this information, let's get it from /proc instead */
|
|
if (unit_has_host_root_cgroup(u))
|
|
return procfs_cpu_get_usage(ret);
|
|
|
|
/* Requisite controllers for CPU accounting are not enabled */
|
|
if ((get_cpu_accounting_mask() & ~u->cgroup_realized_mask) != 0)
|
|
return -ENODATA;
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r > 0) {
|
|
_cleanup_free_ char *val = NULL;
|
|
uint64_t us;
|
|
|
|
r = cg_get_keyed_attribute("cpu", u->cgroup_path, "cpu.stat", STRV_MAKE("usage_usec"), &val);
|
|
if (IN_SET(r, -ENOENT, -ENXIO))
|
|
return -ENODATA;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
r = safe_atou64(val, &us);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
ns = us * NSEC_PER_USEC;
|
|
} else
|
|
return cg_get_attribute_as_uint64("cpuacct", u->cgroup_path, "cpuacct.usage", ret);
|
|
|
|
*ret = ns;
|
|
return 0;
|
|
}
|
|
|
|
int unit_get_cpu_usage(Unit *u, nsec_t *ret) {
|
|
nsec_t ns;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
/* Retrieve the current CPU usage counter. This will subtract the CPU counter taken when the unit was
|
|
* started. If the cgroup has been removed already, returns the last cached value. To cache the value, simply
|
|
* call this function with a NULL return value. */
|
|
|
|
if (!UNIT_CGROUP_BOOL(u, cpu_accounting))
|
|
return -ENODATA;
|
|
|
|
r = unit_get_cpu_usage_raw(u, &ns);
|
|
if (r == -ENODATA && u->cpu_usage_last != NSEC_INFINITY) {
|
|
/* If we can't get the CPU usage anymore (because the cgroup was already removed, for example), use our
|
|
* cached value. */
|
|
|
|
if (ret)
|
|
*ret = u->cpu_usage_last;
|
|
return 0;
|
|
}
|
|
if (r < 0)
|
|
return r;
|
|
|
|
if (ns > u->cpu_usage_base)
|
|
ns -= u->cpu_usage_base;
|
|
else
|
|
ns = 0;
|
|
|
|
u->cpu_usage_last = ns;
|
|
if (ret)
|
|
*ret = ns;
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_get_ip_accounting(
|
|
Unit *u,
|
|
CGroupIPAccountingMetric metric,
|
|
uint64_t *ret) {
|
|
|
|
uint64_t value;
|
|
int fd, r;
|
|
|
|
assert(u);
|
|
assert(metric >= 0);
|
|
assert(metric < _CGROUP_IP_ACCOUNTING_METRIC_MAX);
|
|
assert(ret);
|
|
|
|
if (!UNIT_CGROUP_BOOL(u, ip_accounting))
|
|
return -ENODATA;
|
|
|
|
fd = IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_INGRESS_PACKETS) ?
|
|
u->ip_accounting_ingress_map_fd :
|
|
u->ip_accounting_egress_map_fd;
|
|
if (fd < 0)
|
|
return -ENODATA;
|
|
|
|
if (IN_SET(metric, CGROUP_IP_INGRESS_BYTES, CGROUP_IP_EGRESS_BYTES))
|
|
r = bpf_firewall_read_accounting(fd, &value, NULL);
|
|
else
|
|
r = bpf_firewall_read_accounting(fd, NULL, &value);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Add in additional metrics from a previous runtime. Note that when reexecing/reloading the daemon we compile
|
|
* all BPF programs and maps anew, but serialize the old counters. When deserializing we store them in the
|
|
* ip_accounting_extra[] field, and add them in here transparently. */
|
|
|
|
*ret = value + u->ip_accounting_extra[metric];
|
|
|
|
return r;
|
|
}
|
|
|
|
static int unit_get_io_accounting_raw(Unit *u, uint64_t ret[static _CGROUP_IO_ACCOUNTING_METRIC_MAX]) {
|
|
static const char *const field_names[_CGROUP_IO_ACCOUNTING_METRIC_MAX] = {
|
|
[CGROUP_IO_READ_BYTES] = "rbytes=",
|
|
[CGROUP_IO_WRITE_BYTES] = "wbytes=",
|
|
[CGROUP_IO_READ_OPERATIONS] = "rios=",
|
|
[CGROUP_IO_WRITE_OPERATIONS] = "wios=",
|
|
};
|
|
uint64_t acc[_CGROUP_IO_ACCOUNTING_METRIC_MAX] = {};
|
|
_cleanup_free_ char *path = NULL;
|
|
_cleanup_fclose_ FILE *f = NULL;
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
if (!u->cgroup_path)
|
|
return -ENODATA;
|
|
|
|
if (unit_has_host_root_cgroup(u))
|
|
return -ENODATA; /* TODO: return useful data for the top-level cgroup */
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0) /* TODO: support cgroupv1 */
|
|
return -ENODATA;
|
|
|
|
if (!FLAGS_SET(u->cgroup_realized_mask, CGROUP_MASK_IO))
|
|
return -ENODATA;
|
|
|
|
r = cg_get_path("io", u->cgroup_path, "io.stat", &path);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
f = fopen(path, "re");
|
|
if (!f)
|
|
return -errno;
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *line = NULL;
|
|
const char *p;
|
|
|
|
r = read_line(f, LONG_LINE_MAX, &line);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
break;
|
|
|
|
p = line;
|
|
p += strcspn(p, WHITESPACE); /* Skip over device major/minor */
|
|
p += strspn(p, WHITESPACE); /* Skip over following whitespace */
|
|
|
|
for (;;) {
|
|
_cleanup_free_ char *word = NULL;
|
|
|
|
r = extract_first_word(&p, &word, NULL, EXTRACT_RETAIN_ESCAPE);
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
break;
|
|
|
|
for (CGroupIOAccountingMetric i = 0; i < _CGROUP_IO_ACCOUNTING_METRIC_MAX; i++) {
|
|
const char *x;
|
|
|
|
x = startswith(word, field_names[i]);
|
|
if (x) {
|
|
uint64_t w;
|
|
|
|
r = safe_atou64(x, &w);
|
|
if (r < 0)
|
|
return r;
|
|
|
|
/* Sum up the stats of all devices */
|
|
acc[i] += w;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
memcpy(ret, acc, sizeof(acc));
|
|
return 0;
|
|
}
|
|
|
|
int unit_get_io_accounting(
|
|
Unit *u,
|
|
CGroupIOAccountingMetric metric,
|
|
bool allow_cache,
|
|
uint64_t *ret) {
|
|
|
|
uint64_t raw[_CGROUP_IO_ACCOUNTING_METRIC_MAX];
|
|
int r;
|
|
|
|
/* Retrieve an IO account parameter. This will subtract the counter when the unit was started. */
|
|
|
|
if (!UNIT_CGROUP_BOOL(u, io_accounting))
|
|
return -ENODATA;
|
|
|
|
if (allow_cache && u->io_accounting_last[metric] != UINT64_MAX)
|
|
goto done;
|
|
|
|
r = unit_get_io_accounting_raw(u, raw);
|
|
if (r == -ENODATA && u->io_accounting_last[metric] != UINT64_MAX)
|
|
goto done;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
for (CGroupIOAccountingMetric i = 0; i < _CGROUP_IO_ACCOUNTING_METRIC_MAX; i++) {
|
|
/* Saturated subtraction */
|
|
if (raw[i] > u->io_accounting_base[i])
|
|
u->io_accounting_last[i] = raw[i] - u->io_accounting_base[i];
|
|
else
|
|
u->io_accounting_last[i] = 0;
|
|
}
|
|
|
|
done:
|
|
if (ret)
|
|
*ret = u->io_accounting_last[metric];
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_reset_cpu_accounting(Unit *u) {
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
u->cpu_usage_last = NSEC_INFINITY;
|
|
|
|
r = unit_get_cpu_usage_raw(u, &u->cpu_usage_base);
|
|
if (r < 0) {
|
|
u->cpu_usage_base = 0;
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_reset_ip_accounting(Unit *u) {
|
|
int r = 0, q = 0;
|
|
|
|
assert(u);
|
|
|
|
if (u->ip_accounting_ingress_map_fd >= 0)
|
|
r = bpf_firewall_reset_accounting(u->ip_accounting_ingress_map_fd);
|
|
|
|
if (u->ip_accounting_egress_map_fd >= 0)
|
|
q = bpf_firewall_reset_accounting(u->ip_accounting_egress_map_fd);
|
|
|
|
zero(u->ip_accounting_extra);
|
|
|
|
return r < 0 ? r : q;
|
|
}
|
|
|
|
int unit_reset_io_accounting(Unit *u) {
|
|
int r;
|
|
|
|
assert(u);
|
|
|
|
for (CGroupIOAccountingMetric i = 0; i < _CGROUP_IO_ACCOUNTING_METRIC_MAX; i++)
|
|
u->io_accounting_last[i] = UINT64_MAX;
|
|
|
|
r = unit_get_io_accounting_raw(u, u->io_accounting_base);
|
|
if (r < 0) {
|
|
zero(u->io_accounting_base);
|
|
return r;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int unit_reset_accounting(Unit *u) {
|
|
int r, q, v;
|
|
|
|
assert(u);
|
|
|
|
r = unit_reset_cpu_accounting(u);
|
|
q = unit_reset_io_accounting(u);
|
|
v = unit_reset_ip_accounting(u);
|
|
|
|
return r < 0 ? r : q < 0 ? q : v;
|
|
}
|
|
|
|
void unit_invalidate_cgroup(Unit *u, CGroupMask m) {
|
|
assert(u);
|
|
|
|
if (!UNIT_HAS_CGROUP_CONTEXT(u))
|
|
return;
|
|
|
|
if (m == 0)
|
|
return;
|
|
|
|
/* always invalidate compat pairs together */
|
|
if (m & (CGROUP_MASK_IO | CGROUP_MASK_BLKIO))
|
|
m |= CGROUP_MASK_IO | CGROUP_MASK_BLKIO;
|
|
|
|
if (m & (CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT))
|
|
m |= CGROUP_MASK_CPU | CGROUP_MASK_CPUACCT;
|
|
|
|
if (FLAGS_SET(u->cgroup_invalidated_mask, m)) /* NOP? */
|
|
return;
|
|
|
|
u->cgroup_invalidated_mask |= m;
|
|
unit_add_to_cgroup_realize_queue(u);
|
|
}
|
|
|
|
void unit_invalidate_cgroup_bpf(Unit *u) {
|
|
assert(u);
|
|
|
|
if (!UNIT_HAS_CGROUP_CONTEXT(u))
|
|
return;
|
|
|
|
if (u->cgroup_invalidated_mask & CGROUP_MASK_BPF_FIREWALL) /* NOP? */
|
|
return;
|
|
|
|
u->cgroup_invalidated_mask |= CGROUP_MASK_BPF_FIREWALL;
|
|
unit_add_to_cgroup_realize_queue(u);
|
|
|
|
/* If we are a slice unit, we also need to put compile a new BPF program for all our children, as the IP access
|
|
* list of our children includes our own. */
|
|
if (u->type == UNIT_SLICE) {
|
|
Unit *member;
|
|
Iterator i;
|
|
void *v;
|
|
|
|
HASHMAP_FOREACH_KEY(v, member, u->dependencies[UNIT_BEFORE], i)
|
|
if (UNIT_DEREF(member->slice) == u)
|
|
unit_invalidate_cgroup_bpf(member);
|
|
}
|
|
}
|
|
|
|
bool unit_cgroup_delegate(Unit *u) {
|
|
CGroupContext *c;
|
|
|
|
assert(u);
|
|
|
|
if (!UNIT_VTABLE(u)->can_delegate)
|
|
return false;
|
|
|
|
c = unit_get_cgroup_context(u);
|
|
if (!c)
|
|
return false;
|
|
|
|
return c->delegate;
|
|
}
|
|
|
|
void manager_invalidate_startup_units(Manager *m) {
|
|
Iterator i;
|
|
Unit *u;
|
|
|
|
assert(m);
|
|
|
|
SET_FOREACH(u, m->startup_units, i)
|
|
unit_invalidate_cgroup(u, CGROUP_MASK_CPU|CGROUP_MASK_IO|CGROUP_MASK_BLKIO);
|
|
}
|
|
|
|
static int unit_get_nice(Unit *u) {
|
|
ExecContext *ec;
|
|
|
|
ec = unit_get_exec_context(u);
|
|
return ec ? ec->nice : 0;
|
|
}
|
|
|
|
static uint64_t unit_get_cpu_weight(Unit *u) {
|
|
ManagerState state = manager_state(u->manager);
|
|
CGroupContext *cc;
|
|
|
|
cc = unit_get_cgroup_context(u);
|
|
return cc ? cgroup_context_cpu_weight(cc, state) : CGROUP_WEIGHT_DEFAULT;
|
|
}
|
|
|
|
int compare_job_priority(const void *a, const void *b) {
|
|
const Job *x = a, *y = b;
|
|
int nice_x, nice_y;
|
|
uint64_t weight_x, weight_y;
|
|
int ret;
|
|
|
|
if ((ret = CMP(x->unit->type, y->unit->type)) != 0)
|
|
return -ret;
|
|
|
|
weight_x = unit_get_cpu_weight(x->unit);
|
|
weight_y = unit_get_cpu_weight(y->unit);
|
|
|
|
if ((ret = CMP(weight_x, weight_y)) != 0)
|
|
return -ret;
|
|
|
|
nice_x = unit_get_nice(x->unit);
|
|
nice_y = unit_get_nice(y->unit);
|
|
|
|
if ((ret = CMP(nice_x, nice_y)) != 0)
|
|
return ret;
|
|
|
|
return strcmp(x->unit->id, y->unit->id);
|
|
}
|
|
|
|
static const char* const cgroup_device_policy_table[_CGROUP_DEVICE_POLICY_MAX] = {
|
|
[CGROUP_DEVICE_POLICY_AUTO] = "auto",
|
|
[CGROUP_DEVICE_POLICY_CLOSED] = "closed",
|
|
[CGROUP_DEVICE_POLICY_STRICT] = "strict",
|
|
};
|
|
|
|
int unit_get_cpuset(Unit *u, CPUSet *cpus, const char *name) {
|
|
_cleanup_free_ char *v = NULL;
|
|
int r;
|
|
|
|
assert(u);
|
|
assert(cpus);
|
|
|
|
if (!u->cgroup_path)
|
|
return -ENODATA;
|
|
|
|
if ((u->cgroup_realized_mask & CGROUP_MASK_CPUSET) == 0)
|
|
return -ENODATA;
|
|
|
|
r = cg_all_unified();
|
|
if (r < 0)
|
|
return r;
|
|
if (r == 0)
|
|
return -ENODATA;
|
|
|
|
r = cg_get_attribute("cpuset", u->cgroup_path, name, &v);
|
|
if (r == -ENOENT)
|
|
return -ENODATA;
|
|
if (r < 0)
|
|
return r;
|
|
|
|
return parse_cpu_set_full(v, cpus, false, NULL, NULL, 0, NULL);
|
|
}
|
|
|
|
DEFINE_STRING_TABLE_LOOKUP(cgroup_device_policy, CGroupDevicePolicy);
|