sched/debug: Make schedstats a runtime tunable that is disabled by default

[deliverable/linux.git] / kernel / sched / debug.c

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 641511771ae6a696271f77532ac9e40e28175749..7cfa87bd8b89681ce6862e9934c020bf076c69ae 100644 (file)
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -75,16 +75,18 @@ static void print_cfs_group_stats(struct seq_file *m, int cpu, struct task_group
        PN(se->vruntime);
        PN(se->sum_exec_runtime);
 #ifdef CONFIG_SCHEDSTATS
-       PN(se->statistics.wait_start);
-       PN(se->statistics.sleep_start);
-       PN(se->statistics.block_start);
-       PN(se->statistics.sleep_max);
-       PN(se->statistics.block_max);
-       PN(se->statistics.exec_max);
-       PN(se->statistics.slice_max);
-       PN(se->statistics.wait_max);
-       PN(se->statistics.wait_sum);
-       P(se->statistics.wait_count);
+       if (schedstat_enabled()) {
+               PN(se->statistics.wait_start);
+               PN(se->statistics.sleep_start);
+               PN(se->statistics.block_start);
+               PN(se->statistics.sleep_max);
+               PN(se->statistics.block_max);
+               PN(se->statistics.exec_max);
+               PN(se->statistics.slice_max);
+               PN(se->statistics.wait_max);
+               PN(se->statistics.wait_sum);
+               P(se->statistics.wait_count);
+       }
 #endif
        P(se->load.weight);
 #ifdef CONFIG_SMP
@@ -122,10 +124,12 @@ print_task(struct seq_file *m, struct rq *rq, struct task_struct *p)
                (long long)(p->nvcsw + p->nivcsw),
                p->prio);
 #ifdef CONFIG_SCHEDSTATS
-       SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
-               SPLIT_NS(p->se.statistics.wait_sum),
-               SPLIT_NS(p->se.sum_exec_runtime),
-               SPLIT_NS(p->se.statistics.sum_sleep_runtime));
+       if (schedstat_enabled()) {
+               SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
+                       SPLIT_NS(p->se.statistics.wait_sum),
+                       SPLIT_NS(p->se.sum_exec_runtime),
+                       SPLIT_NS(p->se.statistics.sum_sleep_runtime));
+       }
 #else
        SEQ_printf(m, "%9Ld.%06ld %9Ld.%06ld %9Ld.%06ld",
                0LL, 0L,
@@ -313,17 +317,18 @@ do {                                                                      \
 #define P(n) SEQ_printf(m, "  .%-30s: %d\n", #n, rq->n);
 #define P64(n) SEQ_printf(m, "  .%-30s: %Ld\n", #n, rq->n);
 
-       P(yld_count);
-
-       P(sched_count);
-       P(sched_goidle);
 #ifdef CONFIG_SMP
        P64(avg_idle);
        P64(max_idle_balance_cost);
 #endif
 
-       P(ttwu_count);
-       P(ttwu_local);
+       if (schedstat_enabled()) {
+               P(yld_count);
+               P(sched_count);
+               P(sched_goidle);
+               P(ttwu_count);
+               P(ttwu_local);
+       }
 
 #undef P
 #undef P64
@@ -569,38 +574,39 @@ void proc_sched_show_task(struct task_struct *p, struct seq_file *m)
        nr_switches = p->nvcsw + p->nivcsw;
 
 #ifdef CONFIG_SCHEDSTATS
-       PN(se.statistics.sum_sleep_runtime);
-       PN(se.statistics.wait_start);
-       PN(se.statistics.sleep_start);
-       PN(se.statistics.block_start);
-       PN(se.statistics.sleep_max);
-       PN(se.statistics.block_max);
-       PN(se.statistics.exec_max);
-       PN(se.statistics.slice_max);
-       PN(se.statistics.wait_max);
-       PN(se.statistics.wait_sum);
-       P(se.statistics.wait_count);
-       PN(se.statistics.iowait_sum);
-       P(se.statistics.iowait_count);
        P(se.nr_migrations);
-       P(se.statistics.nr_migrations_cold);
-       P(se.statistics.nr_failed_migrations_affine);
-       P(se.statistics.nr_failed_migrations_running);
-       P(se.statistics.nr_failed_migrations_hot);
-       P(se.statistics.nr_forced_migrations);
-       P(se.statistics.nr_wakeups);
-       P(se.statistics.nr_wakeups_sync);
-       P(se.statistics.nr_wakeups_migrate);
-       P(se.statistics.nr_wakeups_local);
-       P(se.statistics.nr_wakeups_remote);
-       P(se.statistics.nr_wakeups_affine);
-       P(se.statistics.nr_wakeups_affine_attempts);
-       P(se.statistics.nr_wakeups_passive);
-       P(se.statistics.nr_wakeups_idle);
 
-       {
+       if (schedstat_enabled()) {
                u64 avg_atom, avg_per_cpu;
 
+               PN(se.statistics.sum_sleep_runtime);
+               PN(se.statistics.wait_start);
+               PN(se.statistics.sleep_start);
+               PN(se.statistics.block_start);
+               PN(se.statistics.sleep_max);
+               PN(se.statistics.block_max);
+               PN(se.statistics.exec_max);
+               PN(se.statistics.slice_max);
+               PN(se.statistics.wait_max);
+               PN(se.statistics.wait_sum);
+               P(se.statistics.wait_count);
+               PN(se.statistics.iowait_sum);
+               P(se.statistics.iowait_count);
+               P(se.statistics.nr_migrations_cold);
+               P(se.statistics.nr_failed_migrations_affine);
+               P(se.statistics.nr_failed_migrations_running);
+               P(se.statistics.nr_failed_migrations_hot);
+               P(se.statistics.nr_forced_migrations);
+               P(se.statistics.nr_wakeups);
+               P(se.statistics.nr_wakeups_sync);
+               P(se.statistics.nr_wakeups_migrate);
+               P(se.statistics.nr_wakeups_local);
+               P(se.statistics.nr_wakeups_remote);
+               P(se.statistics.nr_wakeups_affine);
+               P(se.statistics.nr_wakeups_affine_attempts);
+               P(se.statistics.nr_wakeups_passive);
+               P(se.statistics.nr_wakeups_idle);
+
                avg_atom = p->se.sum_exec_runtime;
                if (nr_switches)
                        avg_atom = div64_ul(avg_atom, nr_switches);