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| author |   Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:10 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2007-10-15 17:00:10 +0200 |
| commit | b8efb56172bc55082b8490778b07ef73eea0b551 (patch) | |
| tree | 2d70e91af4cbd470904ebb4e28ad558c29e73092 | |
| parent | sched: enable CONFIG_FAIR_GROUP_SCHED=y by default (diff) | |
| download | linux-dev-b8efb56172bc55082b8490778b07ef73eea0b551.tar.xz linux-dev-b8efb56172bc55082b8490778b07ef73eea0b551.zip | |
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>
| -rw-r--r-- | include/linux/sched.h | 4 | ||||
| -rw-r--r-- | kernel/sched.c | 9 | ||||
| -rw-r--r-- | kernel/sched_debug.c | 4 |
3 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h index d0cc58311b13..920eb7354d0a 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -621,6 +621,10 @@ struct sched_info { /* timestamps */ unsigned long long last_arrival,/* when we last ran on a cpu */ last_queued; /* when we were last queued to run */ +#ifdef CONFIG_SCHEDSTATS + /* BKL stats */ + unsigned long bkl_cnt; +#endif }; #endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */ diff --git a/kernel/sched.c b/kernel/sched.c index f33608e9e1a2..5004dff91850 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 } /* diff --git a/kernel/sched_debug.c b/kernel/sched_debug.c index 57ee9d5630a8..823b63a3a3e1 100644 --- a/kernel/sched_debug.c +++ b/kernel/sched_debug.c @@ -136,6 +136,8 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq) SPLIT_NS(spread0)); SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running); SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight); + SEQ_printf(m, " .%-30s: %ld\n", "bkl_cnt", + rq->bkl_cnt); } static void print_cpu(struct seq_file *m, int cpu) @@ -323,6 +325,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m) PN(se.exec_max); PN(se.slice_max); PN(se.wait_max); + P(sched_info.bkl_cnt); #endif SEQ_printf(m, "%-25s:%20Ld\n", "nr_switches", (long long)(p->nvcsw + p->nivcsw)); @@ -350,6 +353,7 @@ void proc_sched_set_task(struct task_struct *p) p->se.exec_max = 0; p->se.slice_max = 0; p->se.wait_max = 0; + p->sched_info.bkl_cnt = 0; #endif p->se.sum_exec_runtime = 0; p->se.prev_sum_exec_runtime = 0; |