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| author | Nikhil Rao <ncrao@google.com> | 2011-07-21 16:43:40 (GMT) |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2011-08-14 10:03:49 (GMT) |
| commit | e8da1b18b32064c43881bceef0f051c2110c9ab9 (patch) | |
| tree | 8d6e9e5713c1da4cee3ceba1da67df6cab22ab9f /kernel/sched_fair.c | |
| parent | d3d9dc3302368269acf94b7381663b93000fe2fe (diff) | |
| download | linux-e8da1b18b32064c43881bceef0f051c2110c9ab9.tar.xz | |
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_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index f9f671a..d201f28 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -1506,6 +1506,7 @@ static void throttle_cfs_rq(struct cfs_rq *cfs_rq) rq->nr_running -= task_delta; cfs_rq->throttled = 1; + cfs_rq->throttled_timestamp = rq->clock; raw_spin_lock(&cfs_b->lock); list_add_tail_rcu(&cfs_rq->throttled_list, &cfs_b->throttled_cfs_rq); raw_spin_unlock(&cfs_b->lock); @@ -1523,8 +1524,10 @@ static void unthrottle_cfs_rq(struct cfs_rq *cfs_rq) cfs_rq->throttled = 0; raw_spin_lock(&cfs_b->lock); + cfs_b->throttled_time += rq->clock - cfs_rq->throttled_timestamp; list_del_rcu(&cfs_rq->throttled_list); raw_spin_unlock(&cfs_b->lock); + cfs_rq->throttled_timestamp = 0; update_rq_clock(rq); /* update hierarchical throttle state */ @@ -1612,6 +1615,7 @@ static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun) throttled = !list_empty(&cfs_b->throttled_cfs_rq); /* idle depends on !throttled (for the case of a large deficit) */ idle = cfs_b->idle && !throttled; + cfs_b->nr_periods += overrun; /* if we're going inactive then everything else can be deferred */ if (idle) @@ -1625,6 +1629,9 @@ static int do_sched_cfs_period_timer(struct cfs_bandwidth *cfs_b, int overrun) goto out_unlock; } + /* account preceding periods in which throttling occurred */ + cfs_b->nr_throttled += overrun; + /* * There are throttled entities so we must first use the new bandwidth * to unthrottle them before making it generally available. This |