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>
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@ -4378,6 +4378,13 @@ static void migrate_tasks(unsigned int dead_cpu)
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*/
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rq->stop = NULL;
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/*
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* put_prev_task() and pick_next_task() sched
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* class method both need to have an up-to-date
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* value of rq->clock[_task]
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*/
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update_rq_clock(rq);
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for ( ; ; ) {
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/*
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* There's this thread running, bail when that's the only
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