linux-kernel - Re: [PATCH] sched: Fix hotplug

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Message-ID: <20091220221405.GD4489@kernel.dk>
Date:	Sun, 20 Dec 2009 23:14:05 +0100
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Sachin Sant <sachinp@...ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>,
	Heiko Carstens <heiko.carstens@...ibm.com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH] sched: Fix hotplug

On Sun, Dec 20 2009, Peter Zijlstra wrote:
> The hot-unplug kstopmachine usage does a wakeup after deactivating the
> cpu, hence we cannot use cpu_active() here but must rely on the good
> olde online.

Yep, this works for me!

Tested-by: Jens Axboe <jens.axboe@...cle.com>

> 
> Signed-off-by: Peter Zijlstra <a.p.zijlstra@...llo.nl>
> ---
>  kernel/sched.c |    2 +-
>  1 files changed, 1 insertions(+), 1 deletions(-)
> 
> diff --git a/kernel/sched.c b/kernel/sched.c
> index 720df10..0ac4fa5 100644
> --- a/kernel/sched.c
> +++ b/kernel/sched.c
> @@ -2348,7 +2348,7 @@ int select_task_rq(struct task_struct *p, int sd_flags, int wake_flags)
>  	 *   not worry about this generic constraint ]
>  	 */
>  	if (unlikely(!cpumask_test_cpu(cpu, &p->cpus_allowed) ||
> -		     !cpu_active(cpu)))
> +		     !cpu_online(cpu)))
>  		cpu = select_fallback_rq(task_cpu(p), p);
>  
>  	return cpu;
> 
> 

-- 
Jens Axboe

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