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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-05-31 10:49:20 +0200
committerIngo Molnar <mingo@elte.hu>2011-05-31 14:19:57 +0200
commitf339b9dc1f03591761d5d930800db24bc0eda1e1 (patch)
tree901c78b6e8ccaf9e74515d176084c75389bc2832
parentf01114cb59d670e9b4f2c335930dd57db96e9360 (diff)
downloadop-kernel-dev-f339b9dc1f03591761d5d930800db24bc0eda1e1.zip
op-kernel-dev-f339b9dc1f03591761d5d930800db24bc0eda1e1.tar.gz
sched: Fix schedstat.nr_wakeups_migrate
While looking over the code I found that with the ttwu rework the nr_wakeups_migrate test broke since we now switch cpus prior to calling ttwu_stat(), hence the test is always true. Cure this by passing the migration state in wake_flags. Also move the whole test under CONFIG_SMP, its hard to migrate tasks on UP :-) Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/n/tip-pwwxl7gdqs5676f1d4cx6pj7@git.kernel.org Signed-off-by: Ingo Molnar <mingo@elte.hu>
-rw-r--r--include/linux/sched.h1
-rw-r--r--kernel/sched.c11
2 files changed, 8 insertions, 4 deletions
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8da84b7..483c1ed 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1063,6 +1063,7 @@ struct sched_domain;
*/
#define WF_SYNC 0x01 /* waker goes to sleep after wakup */
#define WF_FORK 0x02 /* child wakeup after fork */
+#define WF_MIGRATED 0x04 /* internal use, task got migrated */
#define ENQUEUE_WAKEUP 1
#define ENQUEUE_HEAD 2
diff --git a/kernel/sched.c b/kernel/sched.c
index 49cc70b..2fe98ed 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -2447,6 +2447,10 @@ ttwu_stat(struct task_struct *p, int cpu, int wake_flags)
}
rcu_read_unlock();
}
+
+ if (wake_flags & WF_MIGRATED)
+ schedstat_inc(p, se.statistics.nr_wakeups_migrate);
+
#endif /* CONFIG_SMP */
schedstat_inc(rq, ttwu_count);
@@ -2455,9 +2459,6 @@ ttwu_stat(struct task_struct *p, int cpu, int wake_flags)
if (wake_flags & WF_SYNC)
schedstat_inc(p, se.statistics.nr_wakeups_sync);
- if (cpu != task_cpu(p))
- schedstat_inc(p, se.statistics.nr_wakeups_migrate);
-
#endif /* CONFIG_SCHEDSTATS */
}
@@ -2675,8 +2676,10 @@ try_to_wake_up(struct task_struct *p, unsigned int state, int wake_flags)
p->sched_class->task_waking(p);
cpu = select_task_rq(p, SD_BALANCE_WAKE, wake_flags);
- if (task_cpu(p) != cpu)
+ if (task_cpu(p) != cpu) {
+ wake_flags |= WF_MIGRATED;
set_task_cpu(p, cpu);
+ }
#endif /* CONFIG_SMP */
ttwu_queue(p, cpu);
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