e0e2112f61
Inside format_bytes, we return NULL if the value is UINT64_MAX. This
makes some kind of sense where this has some other semantic meaning than
being a value, but in this case the value is both a.) not the default
(so we definitely want to display it), and b.) means "infinity" (or
"max" in cgroup terminology).
This patch adds a small wrapper around format_bytes that can be used for
these cases, to avoid the following situation:
[root@tangsanjiao ~]# cat /sys/fs/cgroup/workload.slice/memory.low
max
[root@tangsanjiao ~]# systemctl show workload.slice -p MemoryLow
MemoryLow=infinity
[root@tangsanjiao ~]# systemctl status workload.slice | grep low:
Memory: 14.9G (low: (null))
After the patch:
[root@tangsanjiao ~]# systemctl status workload.slice | grep low:
Memory: 15.1G (low: infinity)
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#include <inttypes.h>
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#include <net/if.h>
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#include <stdbool.h>
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#include "cgroup-util.h"
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#include "macro.h"
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assert_cc(sizeof(pid_t) == sizeof(int32_t));
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#define PID_PRI PRIi32
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#define PID_FMT "%" PID_PRI
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assert_cc(sizeof(uid_t) == sizeof(uint32_t));
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#define UID_FMT "%" PRIu32
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assert_cc(sizeof(gid_t) == sizeof(uint32_t));
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#define GID_FMT "%" PRIu32
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#if SIZEOF_TIME_T == 8
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# define PRI_TIME PRIi64
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#elif SIZEOF_TIME_T == 4
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# define PRI_TIME "li"
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#else
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# error Unknown time_t size
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#endif
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#if defined __x86_64__ && defined __ILP32__
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# define PRI_TIMEX PRIi64
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#else
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# define PRI_TIMEX "li"
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#endif
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#if SIZEOF_RLIM_T == 8
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# define RLIM_FMT "%" PRIu64
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#elif SIZEOF_RLIM_T == 4
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# define RLIM_FMT "%" PRIu32
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#else
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# error Unknown rlim_t size
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#endif
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#if SIZEOF_DEV_T == 8
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# define DEV_FMT "%" PRIu64
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#elif SIZEOF_DEV_T == 4
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# define DEV_FMT "%" PRIu32
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#else
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# error Unknown dev_t size
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#endif
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#if SIZEOF_INO_T == 8
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# define INO_FMT "%" PRIu64
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#elif SIZEOF_INO_T == 4
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# define INO_FMT "%" PRIu32
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#else
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# error Unknown ino_t size
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#endif
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typedef enum {
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FORMAT_IFNAME_IFINDEX = 1 << 0,
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FORMAT_IFNAME_IFINDEX_WITH_PERCENT = (1 << 1) | FORMAT_IFNAME_IFINDEX,
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} FormatIfnameFlag;
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char *format_ifname_full(int ifindex, char buf[static IF_NAMESIZE + 1], FormatIfnameFlag flag);
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static inline char *format_ifname(int ifindex, char buf[static IF_NAMESIZE + 1]) {
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return format_ifname_full(ifindex, buf, 0);
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}
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typedef enum {
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FORMAT_BYTES_USE_IEC = 1 << 0,
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FORMAT_BYTES_BELOW_POINT = 1 << 1,
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FORMAT_BYTES_TRAILING_B = 1 << 2,
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} FormatBytesFlag;
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#define FORMAT_BYTES_MAX 16
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char *format_bytes_full(char *buf, size_t l, uint64_t t, FormatBytesFlag flag);
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static inline char *format_bytes(char *buf, size_t l, uint64_t t) {
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return format_bytes_full(buf, l, t, FORMAT_BYTES_USE_IEC | FORMAT_BYTES_BELOW_POINT | FORMAT_BYTES_TRAILING_B);
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}
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static inline char *format_bytes_cgroup_protection(char *buf, size_t l, uint64_t t) {
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if (t == CGROUP_LIMIT_MAX) {
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(void) snprintf(buf, l, "%s", "infinity");
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return buf;
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}
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return format_bytes(buf, l, t);
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}
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