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sched: Fix latencytop and sleep profiling vs group scheduling

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The latencytop and sleep accounting code assumes that any
scheduler entity represents a task, this is not so.

Cc: Arjan van de Ven <arjan@linux.intel.com>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra 2009-07-23 20:13:26 +02:00 committed by Ingo Molnar
parent ed680c4ad4
commit e414314cce
1 changed files with 19 additions and 13 deletions
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32
kernel/sched_fair.c
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@ -611,9 +611,13 @@ account_entity_dequeue(struct cfs_rq *cfs_rq, struct sched_entity *se)
static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
{ {
#ifdef CONFIG_SCHEDSTATS #ifdef CONFIG_SCHEDSTATS
struct task_struct *tsk = NULL;
if (entity_is_task(se))
tsk = task_of(se);
if (se->sleep_start) { if (se->sleep_start) {
u64 delta = rq_of(cfs_rq)->clock - se->sleep_start; u64 delta = rq_of(cfs_rq)->clock - se->sleep_start;
struct task_struct *tsk = task_of(se);
if ((s64)delta < 0) if ((s64)delta < 0)
delta = 0; delta = 0;
@ -624,11 +628,11 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
se->sleep_start = 0; se->sleep_start = 0;
se->sum_sleep_runtime += delta; se->sum_sleep_runtime += delta;
account_scheduler_latency(tsk, delta >> 10, 1); if (tsk)
account_scheduler_latency(tsk, delta >> 10, 1);
} }
if (se->block_start) { if (se->block_start) {
u64 delta = rq_of(cfs_rq)->clock - se->block_start; u64 delta = rq_of(cfs_rq)->clock - se->block_start;
struct task_struct *tsk = task_of(se);
if ((s64)delta < 0) if ((s64)delta < 0)
delta = 0; delta = 0;
@ -639,17 +643,19 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se)
se->block_start = 0; se->block_start = 0;
se->sum_sleep_runtime += delta; se->sum_sleep_runtime += delta;
/* if (tsk) {
* Blocking time is in units of nanosecs, so shift by 20 to /*
* get a milliseconds-range estimation of the amount of * Blocking time is in units of nanosecs, so shift by
* time that the task spent sleeping: * 20 to get a milliseconds-range estimation of the
*/ * amount of time that the task spent sleeping:
if (unlikely(prof_on == SLEEP_PROFILING)) { */
if (unlikely(prof_on == SLEEP_PROFILING)) {
profile_hits(SLEEP_PROFILING, (void *)get_wchan(tsk), profile_hits(SLEEP_PROFILING,
delta >> 20); (void *)get_wchan(tsk),
delta >> 20);
}
account_scheduler_latency(tsk, delta >> 10, 0);
} }
account_scheduler_latency(tsk, delta >> 10, 0);
} }
#endif #endif
} }