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sched: Add exports tracking cfs bandwidth control statistics

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This change introduces statistics exports for the cpu sub-system, these are
added through the use of a stat file similar to that exported by other
subsystems.

The following exports are included:

nr_periods:	number of periods in which execution occurred
nr_throttled:	the number of periods above in which execution was throttle
throttled_time:	cumulative wall-time that any cpus have been throttled for
this group

Signed-off-by: Paul Turner <[email protected]>
Signed-off-by: Nikhil Rao <[email protected]>
Signed-off-by: Bharata B Rao <[email protected]>
Reviewed-by: Hidetoshi Seto <[email protected]>
Signed-off-by: Peter Zijlstra <[email protected]>
Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Ingo Molnar <[email protected]>
This commit is contained in:
Nikhil Rao 2011-07-21 09:43:40 -07:00 • committed by Ingo Molnar
commit e8da1b18b3
2 changed files with 28 additions and 0 deletions
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21
kernel/sched.c
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@ -262,6 +262,9 @@ struct cfs_bandwidth {
struct hrtimer period_timer;
struct list_head throttled_cfs_rq;
/* statistics */
int nr_periods, nr_throttled;
u64 throttled_time;
#endif
};
@ -402,6 +405,7 @@ struct cfs_rq {
u64 runtime_expires;
s64 runtime_remaining;
u64 throttled_timestamp;
int throttled, throttle_count;
struct list_head throttled_list;
#endif
@ -9397,6 +9401,19 @@ static int __cfs_schedulable(struct task_group *tg, u64 period, u64 quota)
return ret;
}
static int cpu_stats_show(struct cgroup *cgrp, struct cftype *cft,
struct cgroup_map_cb *cb)
{
struct task_group *tg = cgroup_tg(cgrp);
struct cfs_bandwidth *cfs_b = tg_cfs_bandwidth(tg);
cb->fill(cb, "nr_periods", cfs_b->nr_periods);
cb->fill(cb, "nr_throttled", cfs_b->nr_throttled);
cb->fill(cb, "throttled_time", cfs_b->throttled_time);
return 0;
}
#endif /* CONFIG_CFS_BANDWIDTH */
#endif /* CONFIG_FAIR_GROUP_SCHED */
@ -9443,6 +9460,10 @@ static struct cftype cpu_files[] = {
.read_u64 = cpu_cfs_period_read_u64,
.write_u64 = cpu_cfs_period_write_u64,
},
{
.name = "stat",
.read_map = cpu_stats_show,
},
#endif
#ifdef CONFIG_RT_GROUP_SCHED
{