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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2013-04-12 01:51:00 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@kernel.org> | 2013-05-28 09:40:24 +0200 |
| commit | 1ad4ec0dc740c4183acd6d6e367ca52b28e4fa94 (patch) | |
| tree | 9e50109ed63cdf56ed954a845e257cfefe3149c2 /kernel/sched | |
| parent | 71b1da46ff70309a2ec12ce943aa0d192d2c8f0c (diff) | |
| download | linux-1ad4ec0dc740c4183acd6d6e367ca52b28e4fa94.tar.bz2 | |
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>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 7bf0418dc60f..46d00172ae4a 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; } |