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authorIngo Molnar <mingo@elte.hu>2007-10-15 17:00:10 +0200
committerIngo Molnar <mingo@elte.hu>2007-10-15 17:00:10 +0200
commitb8efb56172bc55082b8490778b07ef73eea0b551 (patch)
tree2d70e91af4cbd470904ebb4e28ad558c29e73092 /kernel/sched.c
parentde8d585a12aef40676f12ddc63e97daaf7752ba1 (diff)
sched debug: BKL usage statistics
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>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c9
1 files changed, 9 insertions, 0 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index f33608e9e1a..5004dff9185 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -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
}
/*