Commit eba1ed4b authored by Ingo Molnar's avatar Ingo Molnar

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
...@@ -921,6 +921,7 @@ struct sched_entity { ...@@ -921,6 +921,7 @@ struct sched_entity {
u64 block_start; u64 block_start;
u64 block_max; u64 block_max;
u64 exec_max; u64 exec_max;
u64 slice_max;
unsigned long wait_runtime_overruns; unsigned long wait_runtime_overruns;
unsigned long wait_runtime_underruns; unsigned long wait_runtime_underruns;
......
...@@ -1603,6 +1603,7 @@ static void __sched_fork(struct task_struct *p) ...@@ -1603,6 +1603,7 @@ static void __sched_fork(struct task_struct *p)
p->se.sleep_max = 0; p->se.sleep_max = 0;
p->se.block_max = 0; p->se.block_max = 0;
p->se.exec_max = 0; p->se.exec_max = 0;
p->se.slice_max = 0;
p->se.wait_max = 0; p->se.wait_max = 0;
p->se.wait_runtime_overruns = 0; p->se.wait_runtime_overruns = 0;
p->se.wait_runtime_underruns = 0; p->se.wait_runtime_underruns = 0;
......
...@@ -254,6 +254,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m) ...@@ -254,6 +254,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
P(se.sleep_max); P(se.sleep_max);
P(se.block_max); P(se.block_max);
P(se.exec_max); P(se.exec_max);
P(se.slice_max);
P(se.wait_max); P(se.wait_max);
P(se.wait_runtime_overruns); P(se.wait_runtime_overruns);
P(se.wait_runtime_underruns); P(se.wait_runtime_underruns);
...@@ -282,6 +283,7 @@ void proc_sched_set_task(struct task_struct *p) ...@@ -282,6 +283,7 @@ void proc_sched_set_task(struct task_struct *p)
p->se.sleep_max = 0; p->se.sleep_max = 0;
p->se.block_max = 0; p->se.block_max = 0;
p->se.exec_max = 0; p->se.exec_max = 0;
p->se.slice_max = 0;
p->se.wait_max = 0; p->se.wait_max = 0;
p->se.wait_runtime_overruns = 0; p->se.wait_runtime_overruns = 0;
p->se.wait_runtime_underruns = 0; p->se.wait_runtime_underruns = 0;
......
...@@ -739,6 +739,17 @@ set_next_entity(struct cfs_rq *cfs_rq, struct sched_entity *se) ...@@ -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_wait_end(cfs_rq, se);
update_stats_curr_start(cfs_rq, se); update_stats_curr_start(cfs_rq, se);
set_cfs_rq_curr(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; se->prev_sum_exec_runtime = se->sum_exec_runtime;
} }
......
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