Commit-ID: 1ad4ec0dc740c4183acd6d6e367ca52b28e4fa94 Gitweb: http://git.kernel.org/tip/1ad4ec0dc740c4183acd6d6e367ca52b28e4fa94 Author: Frederic Weisbecker <[email protected]> AuthorDate: Fri, 12 Apr 2013 01:51:00 +0200 Committer: Ingo Molnar <[email protected]> CommitDate: Tue, 28 May 2013 09:40:24 +0200
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 <[email protected]> Cc: Li Zhong <[email protected]> Cc: Steven Rostedt <[email protected]> Cc: Paul Turner <[email protected]> Cc: Mike Galbraith <[email protected]> Signed-off-by: Peter Zijlstra <[email protected]> Link: http://lkml.kernel.org/r/[email protected] Signed-off-by: Ingo Molnar <[email protected]> --- kernel/sched/core.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 7bf0418..46d0017 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -1365,6 +1365,8 @@ static int ttwu_remote(struct task_struct *p, int wake_flags) rq = __task_rq_lock(p); if (p->on_rq) { + /* check_preempt_curr() may use rq clock */ + update_rq_clock(rq); ttwu_do_wakeup(rq, p, wake_flags); ret = 1; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
