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sched: debug: track maximum 'slice'

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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>
This commit is contained in:
Ingo Molnar 2007-10-15 17:00:02 +02:00
parent a4b29ba2f7
commit eba1ed4b7e
4 changed files with 15 additions and 0 deletions
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1
include/linux/sched.h
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@ -921,6 +921,7 @@ struct sched_entity {
u64 block_start;
u64 block_max;
u64 exec_max;
u64 slice_max;
unsigned long wait_runtime_overruns;
unsigned long wait_runtime_underruns;

1
kernel/sched.c
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@ -1603,6 +1603,7 @@ static void __sched_fork(struct task_struct *p)
p->se.sleep_max = 0;
p->se.block_max = 0;
p->se.exec_max = 0;
p->se.slice_max = 0;
p->se.wait_max = 0;
p->se.wait_runtime_overruns = 0;
p->se.wait_runtime_underruns = 0;

2
kernel/sched_debug.c
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@ -254,6 +254,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
P(se.sleep_max);
P(se.block_max);
P(se.exec_max);
P(se.slice_max);
P(se.wait_max);
P(se.wait_runtime_overruns);
P(se.wait_runtime_underruns);
@ -282,6 +283,7 @@ void proc_sched_set_task(struct task_struct *p)
p->se.sleep_max = 0;
p->se.block_max = 0;
p->se.exec_max = 0;
p->se.slice_max = 0;
p->se.wait_max = 0;
p->se.wait_runtime_overruns = 0;
p->se.wait_runtime_underruns = 0;

11
kernel/sched_fair.c
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@ -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;
}