Commit 77bd3970 authored Apr 12, 2013 by Frederic Weisbecker Committed by Ingo Molnar May 28, 2013

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>

parent c5405a49

kernel/sched/core.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -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