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Commit eba1ed4b authored by Ingo Molnar's avatar Ingo Molnar
Browse files

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: default avatarIngo Molnar <mingo@elte.hu>
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Signed-off-by: default avatarMike Galbraith <efault@gmx.de>
Reviewed-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent a4b29ba2

include/linux/sched.h

+1 −0
Original line number Diff line number Diff line
@@ -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;

kernel/sched.c

+1 −0
Original line number Diff line number Diff line
@@ -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;

kernel/sched_debug.c

+2 −0
Original line number Diff line number Diff line
@@ -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;

kernel/sched_fair.c

+11 −0
Original line number Diff line number Diff line
@@ -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;

}