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https://github.com/troglobit/finit.git
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Joachim Wiberg
a37037ded4
This patch adds support for detecting if the Linux kernel Fint runs on
has support for cgroups v2. The probe is done very early, in runlevel
S, when attempting to mount /sys/fs/cgroup. Meaning, the log message
may be lost on systems that do not run sysklogd[1].
Here's the relevant logs from a system running myLinux on a kernel
that has cgroups v2 support disabled:
Jan 10 20:19:40 anarchy finit[1]: myLinux 2021.11-696-g8fddaf36ed, entering runlevel S
Jan 10 20:19:40 anarchy finit[1]: Kernel does not support cgroups v2, disabling.
Jan 10 20:19:41 anarchy finit[1]: myLinux 2021.11-696-g8fddaf36ed, entering runlevel 2
All code paths that attempt to set or query kernel cgroups config has
been short circuited when this happens. However, this does not apply
to any cgroup related config in the Finit .conf files -- which may of
course be omitted. Yet, if configuration directives exist, they will
be parsed and may cause error.
Also, the initctl tool checks if /sys/fs/cgroup is mounted at runtime
and disables all status output and commands that rely on the feature.
Signed-off-by: Joachim Wiberg <troglobit@gmail.com>
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* Cgroup utility functions for initctl
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*
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* Copyright (c) 2019-2021 Joachim Wiberg <troglobit@gmail.com>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#ifndef FINIT_CGUTIL_H_
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#define FINIT_CGUTIL_H_
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#include <stdint.h>
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#include <stdlib.h>
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struct cg {
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struct cg *cg_next;
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/* stats */
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char *cg_path; /* path in /sys/fs/cgroup */
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uint64_t cg_prev; /* cpuacct.usage */
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uint64_t cg_rss; /* memory.stat */
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uint64_t cg_vmlib; /* memory.stat */
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uint64_t cg_vmsize; /* memory.current */
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float cg_memshare; /* cg_rss / total_ram * 100 */
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float cg_load; /* curr - prev / 10000000.0 */
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/* config */
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struct {
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char min[32];
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char max[32];
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} cg_mem;
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struct {
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char set[16];
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char weight[32];
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char max[32];
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} cg_cpu;
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};
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int cgroup_avail(void);
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char *pid_cmdline (int pid, char *buf, size_t len);
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char *pid_comm (int pid, char *buf, size_t len);
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char *pid_cgroup (int pid, char *buf, size_t len);
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uint64_t cgroup_memory(char *group);
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struct cg *cg_stats(char *path);
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struct cg *cg_conf (char *path);
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int cgroup_tree (char *path, char *pfx, int mode, int pos);
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int show_cgroup (char *arg);
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int show_cgtop (char *arg);
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int show_cgps (char *arg);
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#endif /* FINIT_CGUTIL_H_ */
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/**
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* Local Variables:
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* indent-tabs-mode: t
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* c-file-style: "linux"
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* End:
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*/
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