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| author | Peter Zijlstra <a.p.zijlstra@chello.nl> | 2009-07-23 20:13:26 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-02 09:12:18 +0200 |
| commit | 768d0c27226e6587cad2fcf543f9711da3f3774e (patch) | |
| tree | 0e299fb34584ff3c5c59f3ed95da70aab372dbc7 /kernel/sched_fair.c | |
| parent | 8f0dfc34e9b323a028c2ec41abb7e9de477b7a94 (diff) | |
| download | lwn-768d0c27226e6587cad2fcf543f9711da3f3774e.tar.gz lwn-768d0c27226e6587cad2fcf543f9711da3f3774e.zip | |
sched: Add wait, sleep and iowait accounting tracepoints
Add 3 schedstat tracepoints to help account for wait-time,
sleep-time and iowait-time.
They can also be used as a perf-counter source to profile tasks
on these clocks.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
LKML-Reference: <new-submission>
[ build fix for the !CONFIG_SCHEDSTATS case ]
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 471fa281f5e0..2ff850f90d1e 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -546,6 +546,13 @@ update_stats_wait_end(struct cfs_rq *cfs_rq, struct sched_entity *se) schedstat_set(se->wait_sum, se->wait_sum + rq_of(cfs_rq)->clock - se->wait_start); schedstat_set(se->wait_start, 0); + +#ifdef CONFIG_SCHEDSTATS + if (entity_is_task(se)) { + trace_sched_stat_wait(task_of(se), + rq_of(cfs_rq)->clock - se->wait_start); + } +#endif } static inline void @@ -636,8 +643,10 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) se->sleep_start = 0; se->sum_sleep_runtime += delta; - if (tsk) + if (tsk) { account_scheduler_latency(tsk, delta >> 10, 1); + trace_sched_stat_sleep(tsk, delta); + } } if (se->block_start) { u64 delta = rq_of(cfs_rq)->clock - se->block_start; @@ -655,6 +664,7 @@ static void enqueue_sleeper(struct cfs_rq *cfs_rq, struct sched_entity *se) if (tsk->in_iowait) { se->iowait_sum += delta; se->iowait_count++; + trace_sched_stat_iowait(tsk, delta); } /* |