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sched/core: add forced idle accounting for cgroups

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4feee7d126 previously added per-task forced idle accounting. This patch
extends this to also include cgroups.

rstat is used for cgroup accounting, except for the root, which uses
kcpustat in order to bypass the need for doing an rstat flush when
reading root stats.

Only cgroup v2 is supported. Similar to the task accounting, the cgroup
accounting requires that schedstats is enabled.

Signed-off-by: Josh Don <joshdon@google.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Tejun Heo <tj@kernel.org>
Link: https://lkml.kernel.org/r/20220629211426.3329954-1-joshdon@google.com
This commit is contained in:
Josh Don 2022-06-29 14:14:26 -07:00 • committed by Peter Zijlstra
parent b812fc9768
commit 1fcf54deb7
5 changed files with 69 additions and 7 deletions
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7
include/linux/kernel_stat.h
View file

@ -28,6 +28,9 @@ enum cpu_usage_stat {
CPUTIME_STEAL,
CPUTIME_GUEST,
CPUTIME_GUEST_NICE,
#ifdef CONFIG_SCHED_CORE
CPUTIME_FORCEIDLE,
#endif
NR_STATS,
};
@ -115,4 +118,8 @@ extern void account_process_tick(struct task_struct *, int user);
extern void account_idle_ticks(unsigned long ticks);
#ifdef CONFIG_SCHED_CORE
extern void __account_forceidle_time(struct task_struct *tsk, u64 delta);
#endif
#endif /* _LINUX_KERNEL_STAT_H */