sched: Update rq clock before calling check_preempt_curr()
check_preempt_curr() of fair class needs an uptodate sched clock value to update runtime stats of the current task of the target's rq. When a task is woken up, activate_task() is usually called right before ttwu_do_wakeup() unless the task is still in the runqueue. In the latter case we need to update the rq clock explicitly because activate_task() isn't here to do the job for us. 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/1365724262-20142-4-git-send-email-fweisbec@gmail.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -1365,6 +1365,8 @@ static int ttwu_remote(struct task_struct *p, int wake_flags)
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rq = __task_rq_lock(p);
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if (p->on_rq) {
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/* check_preempt_curr() may use rq clock */
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update_rq_clock(rq);
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ttwu_do_wakeup(rq, p, wake_flags);
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ret = 1;
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}
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