66ebf6c0a1
Unfortunately, due to the disagreements in the kernel development community, CPU controller cgroup v2 support has not been merged and enabling it requires applying two small out-of-tree kernel patches. The situation is explained in the following documentation. https://git.kernel.org/cgit/linux/kernel/git/tj/cgroup.git/tree/Documentation/cgroup-v2-cpu.txt?h=cgroup-v2-cpu While it isn't clear what will happen with CPU controller cgroup v2 support, there are critical features which are possible only on cgroup v2 such as buffered write control making cgroup v2 essential for a lot of workloads. This commit implements systemd CPU controller support on the unified hierarchy so that users who choose to deploy CPU controller cgroup v2 support can easily take advantage of it. On the unified hierarchy, "cpu.weight" knob replaces "cpu.shares" and "cpu.max" replaces "cpu.cfs_period_us" and "cpu.cfs_quota_us". [Startup]CPUWeight config options are added with the usual compat translation. CPU quota settings remain unchanged and apply to both legacy and unified hierarchies. v2: - Error in man page corrected. - CPU config application in cgroup_context_apply() refactored. - CPU accounting now works on unified hierarchy.
240 lines
9.4 KiB
C
240 lines
9.4 KiB
C
#pragma once
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/***
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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***/
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#include <dirent.h>
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#include <stdbool.h>
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#include <stdint.h>
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#include <stdio.h>
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#include <sys/types.h>
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#include "def.h"
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#include "hashmap.h"
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#include "macro.h"
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#include "set.h"
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/* An enum of well known cgroup controllers */
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typedef enum CGroupController {
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CGROUP_CONTROLLER_CPU,
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CGROUP_CONTROLLER_CPUACCT,
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CGROUP_CONTROLLER_IO,
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CGROUP_CONTROLLER_BLKIO,
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CGROUP_CONTROLLER_MEMORY,
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CGROUP_CONTROLLER_DEVICES,
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CGROUP_CONTROLLER_PIDS,
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_CGROUP_CONTROLLER_MAX,
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_CGROUP_CONTROLLER_INVALID = -1,
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} CGroupController;
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#define CGROUP_CONTROLLER_TO_MASK(c) (1 << (c))
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/* A bit mask of well known cgroup controllers */
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typedef enum CGroupMask {
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CGROUP_MASK_CPU = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPU),
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CGROUP_MASK_CPUACCT = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_CPUACCT),
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CGROUP_MASK_IO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_IO),
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CGROUP_MASK_BLKIO = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_BLKIO),
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CGROUP_MASK_MEMORY = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_MEMORY),
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CGROUP_MASK_DEVICES = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_DEVICES),
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CGROUP_MASK_PIDS = CGROUP_CONTROLLER_TO_MASK(CGROUP_CONTROLLER_PIDS),
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_CGROUP_MASK_ALL = CGROUP_CONTROLLER_TO_MASK(_CGROUP_CONTROLLER_MAX) - 1
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} CGroupMask;
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/* Special values for all weight knobs on unified hierarchy */
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#define CGROUP_WEIGHT_INVALID ((uint64_t) -1)
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#define CGROUP_WEIGHT_MIN UINT64_C(1)
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#define CGROUP_WEIGHT_MAX UINT64_C(10000)
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#define CGROUP_WEIGHT_DEFAULT UINT64_C(100)
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#define CGROUP_LIMIT_MIN UINT64_C(0)
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#define CGROUP_LIMIT_MAX ((uint64_t) -1)
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static inline bool CGROUP_WEIGHT_IS_OK(uint64_t x) {
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return
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x == CGROUP_WEIGHT_INVALID ||
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(x >= CGROUP_WEIGHT_MIN && x <= CGROUP_WEIGHT_MAX);
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}
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/* IO limits on unified hierarchy */
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typedef enum CGroupIOLimitType {
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CGROUP_IO_RBPS_MAX,
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CGROUP_IO_WBPS_MAX,
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CGROUP_IO_RIOPS_MAX,
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CGROUP_IO_WIOPS_MAX,
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_CGROUP_IO_LIMIT_TYPE_MAX,
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_CGROUP_IO_LIMIT_TYPE_INVALID = -1
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} CGroupIOLimitType;
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extern const uint64_t cgroup_io_limit_defaults[_CGROUP_IO_LIMIT_TYPE_MAX];
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const char* cgroup_io_limit_type_to_string(CGroupIOLimitType t) _const_;
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CGroupIOLimitType cgroup_io_limit_type_from_string(const char *s) _pure_;
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/* Special values for the cpu.shares attribute */
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#define CGROUP_CPU_SHARES_INVALID ((uint64_t) -1)
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#define CGROUP_CPU_SHARES_MIN UINT64_C(2)
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#define CGROUP_CPU_SHARES_MAX UINT64_C(262144)
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#define CGROUP_CPU_SHARES_DEFAULT UINT64_C(1024)
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static inline bool CGROUP_CPU_SHARES_IS_OK(uint64_t x) {
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return
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x == CGROUP_CPU_SHARES_INVALID ||
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(x >= CGROUP_CPU_SHARES_MIN && x <= CGROUP_CPU_SHARES_MAX);
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}
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/* Special values for the blkio.weight attribute */
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#define CGROUP_BLKIO_WEIGHT_INVALID ((uint64_t) -1)
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#define CGROUP_BLKIO_WEIGHT_MIN UINT64_C(10)
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#define CGROUP_BLKIO_WEIGHT_MAX UINT64_C(1000)
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#define CGROUP_BLKIO_WEIGHT_DEFAULT UINT64_C(500)
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static inline bool CGROUP_BLKIO_WEIGHT_IS_OK(uint64_t x) {
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return
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x == CGROUP_BLKIO_WEIGHT_INVALID ||
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(x >= CGROUP_BLKIO_WEIGHT_MIN && x <= CGROUP_BLKIO_WEIGHT_MAX);
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}
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/*
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* General rules:
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*
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* We accept named hierarchies in the syntax "foo" and "name=foo".
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*
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* We expect that named hierarchies do not conflict in name with a
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* kernel hierarchy, modulo the "name=" prefix.
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*
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* We always generate "normalized" controller names, i.e. without the
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* "name=" prefix.
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*
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* We require absolute cgroup paths. When returning, we will always
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* generate paths with multiple adjacent / removed.
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*/
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int cg_enumerate_processes(const char *controller, const char *path, FILE **_f);
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int cg_read_pid(FILE *f, pid_t *_pid);
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int cg_read_event(const char *controller, const char *path, const char *event,
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char **val);
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int cg_enumerate_subgroups(const char *controller, const char *path, DIR **_d);
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int cg_read_subgroup(DIR *d, char **fn);
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typedef enum CGroupFlags {
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CGROUP_SIGCONT = 1,
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CGROUP_IGNORE_SELF = 2,
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CGROUP_REMOVE = 4,
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} CGroupFlags;
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typedef void (*cg_kill_log_func_t)(pid_t pid, int sig, void *userdata);
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int cg_kill(const char *controller, const char *path, int sig, CGroupFlags flags, Set *s, cg_kill_log_func_t kill_log, void *userdata);
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int cg_kill_recursive(const char *controller, const char *path, int sig, CGroupFlags flags, Set *s, cg_kill_log_func_t kill_log, void *userdata);
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int cg_migrate(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
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int cg_migrate_recursive(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
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int cg_migrate_recursive_fallback(const char *cfrom, const char *pfrom, const char *cto, const char *pto, CGroupFlags flags);
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int cg_split_spec(const char *spec, char **controller, char **path);
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int cg_mangle_path(const char *path, char **result);
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int cg_get_path(const char *controller, const char *path, const char *suffix, char **fs);
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int cg_get_path_and_check(const char *controller, const char *path, const char *suffix, char **fs);
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int cg_pid_get_path(const char *controller, pid_t pid, char **path);
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int cg_trim(const char *controller, const char *path, bool delete_root);
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int cg_rmdir(const char *controller, const char *path);
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int cg_create(const char *controller, const char *path);
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int cg_attach(const char *controller, const char *path, pid_t pid);
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int cg_attach_fallback(const char *controller, const char *path, pid_t pid);
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int cg_create_and_attach(const char *controller, const char *path, pid_t pid);
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int cg_set_attribute(const char *controller, const char *path, const char *attribute, const char *value);
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int cg_get_attribute(const char *controller, const char *path, const char *attribute, char **ret);
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int cg_get_keyed_attribute(const char *controller, const char *path, const char *attribute, const char **keys, char **values);
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int cg_set_group_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid);
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int cg_set_task_access(const char *controller, const char *path, mode_t mode, uid_t uid, gid_t gid);
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int cg_install_release_agent(const char *controller, const char *agent);
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int cg_uninstall_release_agent(const char *controller);
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int cg_is_empty(const char *controller, const char *path);
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int cg_is_empty_recursive(const char *controller, const char *path);
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int cg_get_root_path(char **path);
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int cg_path_get_session(const char *path, char **session);
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int cg_path_get_owner_uid(const char *path, uid_t *uid);
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int cg_path_get_unit(const char *path, char **unit);
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int cg_path_get_user_unit(const char *path, char **unit);
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int cg_path_get_machine_name(const char *path, char **machine);
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int cg_path_get_slice(const char *path, char **slice);
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int cg_path_get_user_slice(const char *path, char **slice);
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int cg_shift_path(const char *cgroup, const char *cached_root, const char **shifted);
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int cg_pid_get_path_shifted(pid_t pid, const char *cached_root, char **cgroup);
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int cg_pid_get_session(pid_t pid, char **session);
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int cg_pid_get_owner_uid(pid_t pid, uid_t *uid);
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int cg_pid_get_unit(pid_t pid, char **unit);
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int cg_pid_get_user_unit(pid_t pid, char **unit);
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int cg_pid_get_machine_name(pid_t pid, char **machine);
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int cg_pid_get_slice(pid_t pid, char **slice);
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int cg_pid_get_user_slice(pid_t pid, char **slice);
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int cg_path_decode_unit(const char *cgroup, char **unit);
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char *cg_escape(const char *p);
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char *cg_unescape(const char *p) _pure_;
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bool cg_controller_is_valid(const char *p);
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int cg_slice_to_path(const char *unit, char **ret);
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typedef const char* (*cg_migrate_callback_t)(CGroupMask mask, void *userdata);
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int cg_create_everywhere(CGroupMask supported, CGroupMask mask, const char *path);
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int cg_attach_everywhere(CGroupMask supported, const char *path, pid_t pid, cg_migrate_callback_t callback, void *userdata);
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int cg_attach_many_everywhere(CGroupMask supported, const char *path, Set* pids, cg_migrate_callback_t callback, void *userdata);
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int cg_migrate_everywhere(CGroupMask supported, const char *from, const char *to, cg_migrate_callback_t callback, void *userdata);
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int cg_trim_everywhere(CGroupMask supported, const char *path, bool delete_root);
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int cg_enable_everywhere(CGroupMask supported, CGroupMask mask, const char *p);
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int cg_mask_supported(CGroupMask *ret);
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int cg_kernel_controllers(Set *controllers);
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bool cg_ns_supported(void);
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int cg_unified(void);
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void cg_unified_flush(void);
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bool cg_is_unified_wanted(void);
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bool cg_is_legacy_wanted(void);
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const char* cgroup_controller_to_string(CGroupController c) _const_;
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CGroupController cgroup_controller_from_string(const char *s) _pure_;
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int cg_weight_parse(const char *s, uint64_t *ret);
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int cg_cpu_shares_parse(const char *s, uint64_t *ret);
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int cg_blkio_weight_parse(const char *s, uint64_t *ret);
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