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authorNikhil Rao <ncrao@google.com>2011-07-21 09:43:40 -0700
committerIngo Molnar <mingo@elte.hu>2011-08-14 12:03:49 +0200
commite8da1b18b32064c43881bceef0f051c2110c9ab9 (patch)
tree8d6e9e5713c1da4cee3ceba1da67df6cab22ab9f /kernel/sched.c
parentd3d9dc3302368269acf94b7381663b93000fe2fe (diff)
sched: Add exports tracking cfs bandwidth control statistics
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 <pjt@google.com> Signed-off-by: Nikhil Rao <ncrao@google.com> Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com> Reviewed-by: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/20110721184758.198901931@google.com Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 397317248ddd..35c91859f8a6 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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
{