Commit-ID: 77bd39702f0b3840cea17681409270b16a3b93c0
Gitweb: http://git.kernel.org/tip/77bd39702f0b3840cea17681409270b16a3b93c0
Author: Frederic Weisbecker <fweisbec@xxxxxxxxx>
AuthorDate: Fri, 12 Apr 2013 01:50:58 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 28 May 2013 09:40:23 +0200
sched: Update rq clock before migrating tasks out of dying CPU
Because the sched_class::put_prev_task() callback of rt and fair
classes are referring to the rq clock to update their runtime
statistics. There is a missing rq clock update from the CPU
hotplug notifier's entry point of the scheduler.
Signed-off-by: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Li Zhong <zhong@xxxxxxxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Paul Turner <pjt@xxxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Signed-off-by: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1365724262-20142-2-git-send-email-fweisbec@xxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
kernel/sched/core.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index 79e48e6..7bf0418 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -4378,6 +4378,13 @@ static void migrate_tasks(unsigned int dead_cpu)
*/
rq->stop = NULL;
+ /*
+ * put_prev_task() and pick_next_task() sched
+ * class method both need to have an up-to-date
+ * value of rq->clock[_task]
+ */
+ update_rq_clock(rq);
+
for ( ; ; ) {
/*
* There's this thread running, bail when that's the only
--
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