sched: Add statistic for newidle load balance cost

Tracking rq->max_idle_balance_cost and sd->max_newidle_lb_cost.
It's useful to know these values in debug mode.

Signed-off-by: Alex Shi <alex.shi@linaro.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/52E0F3BF.5020904@linaro.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>

diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 3068f37f7c5f6089a0aaf4df896a8b891cc36fe4..fb9764fbc5373549368eff48ef72dfdd0b20ff21 100644 (file)
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4811,7 +4811,7 @@ set_table_entry(struct ctl_table *entry,
 static struct ctl_table *
 sd_alloc_ctl_domain_table(struct sched_domain *sd)
 {
-       struct ctl_table *table = sd_alloc_ctl_entry(13);
+       struct ctl_table *table = sd_alloc_ctl_entry(14);
 
        if (table == NULL)
                return NULL;
@@ -4839,9 +4839,12 @@ sd_alloc_ctl_domain_table(struct sched_domain *sd)
                sizeof(int), 0644, proc_dointvec_minmax, false);
        set_table_entry(&table[10], "flags", &sd->flags,
                sizeof(int), 0644, proc_dointvec_minmax, false);
-       set_table_entry(&table[11], "name", sd->name,
+       set_table_entry(&table[11], "max_newidle_lb_cost",
+               &sd->max_newidle_lb_cost,
+               sizeof(long), 0644, proc_doulongvec_minmax, false);
+       set_table_entry(&table[12], "name", sd->name,
                CORENAME_MAX_SIZE, 0444, proc_dostring, false);
-       /* &table[12] is terminator */
+       /* &table[13] is terminator */
 
        return table;
 }

diff --git a/kernel/sched/debug.c b/kernel/sched/debug.c
index 31b908daaa1b9d8d9c380b88f7ceb683765365c3..f3344c31632aee78050316de3138fbe69280d027 100644 (file)
--- a/kernel/sched/debug.c
+++ b/kernel/sched/debug.c
@@ -321,6 +321,7 @@ do {                                                                        \
        P(sched_goidle);
 #ifdef CONFIG_SMP
        P64(avg_idle);
+       P64(max_idle_balance_cost);
 #endif
 
        P(ttwu_count);