On Mon, 23 Mar 2009, Ingo Molnar wrote:
> * Miklos Szeredi <mik...@szeredi.hu> wrote:
>
> > This one incorporates comments from Oleg and Ingo. Please apply
> > to 2.6.29 and 2.6.2[78]-stable trees.
>
> The fix first needs to go upstream. There's an alternative patch
> below. Would you mind to give it a test? Chances are that it will
> make UML even faster than your fix.
Just the opposite. With my patch a UML image boots in 17 seconnds,
with your patch it boots in 33 seconds. Without either patch it boots
in about 5 minutes.
Thanks,
Miklos
>
> Ingo
>
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 3e827b8..2d60f23 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -2119,7 +2119,8 @@ unsigned long wait_task_inactive(struct task_struct *p,
> long match_state)
> * yield - it could be a while.
> */
> if (unlikely(on_rq)) {
> - schedule_timeout_uninterruptible(1);
> + cpu_relax();
> + cond_resched();
> continue;
> }
>
>
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