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sched debug: BKL usage statistics

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add per task and per rq BKL usage statistics.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Ingo Molnar
2007-10-15 17:00:10 +02:00
parent de8d585a12
commit b8efb56172
3 changed files with 17 additions and 0 deletions
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9
kernel/sched.c
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@@ -356,6 +356,9 @@ struct rq {
/* try_to_wake_up() stats */
unsigned long ttwu_cnt;
unsigned long ttwu_local;
/* BKL stats */
unsigned long bkl_cnt;
#endif
struct lock_class_key rq_lock_key;
};
@@ -3414,6 +3417,12 @@ static inline void schedule_debug(struct task_struct *prev)
profile_hit(SCHED_PROFILING, __builtin_return_address(0));
schedstat_inc(this_rq(), sched_cnt);
#ifdef CONFIG_SCHEDSTATS
if (unlikely(prev->lock_depth >= 0)) {
schedstat_inc(this_rq(), bkl_cnt);
schedstat_inc(prev, sched_info.bkl_cnt);
}
#endif
}
/*