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| author | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:02 +0200 |
| commit | eba1ed4b7e52720e3099325874811c38a5ec1562 (patch) | |
| tree | 4ce145dd10b6cc248a2bc3463822dff23f9dd3c5 /kernel/sched_fair.c | |
| parent | a4b29ba2f72673aaa60ba11ced74d579771dd578 (diff) | |
| download | lwn-eba1ed4b7e52720e3099325874811c38a5ec1562.tar.gz lwn-eba1ed4b7e52720e3099325874811c38a5ec1562.zip | |
sched: debug: track maximum 'slice'
track the maximum amount of time a task has executed while
the CPU load was at least 2x. (i.e. at least two nice-0
tasks were runnable)
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: Mike Galbraith <efault@gmx.de>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 0990b20fdcf5..5c15d8ae92cb 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -739,6 +739,17 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) update_stats_wait_end(cfs_rq, se); update_stats_curr_start(cfs_rq, se); set_cfs_rq_curr(cfs_rq, se); +#ifdef CONFIG_SCHEDSTATS + /* + * Track our maximum slice length, if the CPU's load is at + * least twice that of our own weight (i.e. dont track it + * when there are only lesser-weight tasks around): + */ + if (rq_of(cfs_rq)->ls.load.weight >= 2*se->load.weight) { + se->slice_max = max(se->slice_max, + se->sum_exec_runtime - se->prev_sum_exec_runtime); + } +#endif se->prev_sum_exec_runtime = se->sum_exec_runtime; } |