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@gmail.com>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul Turner <pjt@google.com>
Cc: Mike Galbraith <efault@gmx.de>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1365724262-20142-2-git-send-email-fweisbec@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Frederic Weisbecker 2013-04-12 01:50:58 +02:00 committed by Ingo Molnar
parent c5405a495e
commit 77bd39702f

View file

@ -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