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>
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@ -621,6 +621,10 @@ struct sched_info {
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/* timestamps */
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unsigned long long last_arrival,/* when we last ran on a cpu */
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last_queued; /* when we were last queued to run */
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#ifdef CONFIG_SCHEDSTATS
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/* BKL stats */
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unsigned long bkl_cnt;
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#endif
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};
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#endif /* defined(CONFIG_SCHEDSTATS) || defined(CONFIG_TASK_DELAY_ACCT) */
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@ -356,6 +356,9 @@ struct rq {
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/* try_to_wake_up() stats */
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unsigned long ttwu_cnt;
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unsigned long ttwu_local;
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/* BKL stats */
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unsigned long bkl_cnt;
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#endif
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struct lock_class_key rq_lock_key;
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};
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@ -3414,6 +3417,12 @@ static inline void schedule_debug(struct task_struct *prev)
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profile_hit(SCHED_PROFILING, __builtin_return_address(0));
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schedstat_inc(this_rq(), sched_cnt);
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#ifdef CONFIG_SCHEDSTATS
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if (unlikely(prev->lock_depth >= 0)) {
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schedstat_inc(this_rq(), bkl_cnt);
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schedstat_inc(prev, sched_info.bkl_cnt);
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}
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#endif
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}
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/*
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@ -136,6 +136,8 @@ void print_cfs_rq(struct seq_file *m, int cpu, struct cfs_rq *cfs_rq)
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SPLIT_NS(spread0));
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SEQ_printf(m, " .%-30s: %ld\n", "nr_running", cfs_rq->nr_running);
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SEQ_printf(m, " .%-30s: %ld\n", "load", cfs_rq->load.weight);
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SEQ_printf(m, " .%-30s: %ld\n", "bkl_cnt",
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rq->bkl_cnt);
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}
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static void print_cpu(struct seq_file *m, int cpu)
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@ -323,6 +325,7 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
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PN(se.exec_max);
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PN(se.slice_max);
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PN(se.wait_max);
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P(sched_info.bkl_cnt);
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#endif
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SEQ_printf(m, "%-25s:%20Ld\n",
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"nr_switches", (long long)(p->nvcsw + p->nivcsw));
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@ -350,6 +353,7 @@ void proc_sched_set_task(struct task_struct *p)
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p->se.exec_max = 0;
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p->se.slice_max = 0;
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p->se.wait_max = 0;
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p->sched_info.bkl_cnt = 0;
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#endif
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p->se.sum_exec_runtime = 0;
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p->se.prev_sum_exec_runtime = 0;
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