linux-kernel - Re: [PATCH 3/4] scheduler: replace migration_thread with cpu

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Message-ID: <1272893192.5605.122.camel@twins>
Date:	Mon, 03 May 2010 15:26:32 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Tejun Heo <tj@...nel.org>
Cc:	mingo@...e.hu, linux-kernel@...r.kernel.org, x86@...nel.org,
	oleg@...hat.com, rusty@...tcorp.com.au, sivanich@....com,
	heiko.carstens@...ibm.com, dipankar@...ibm.com,
	josh@...edesktop.org, paulmck@...ux.vnet.ibm.com,
	akpm@...ux-foundation.org, arjan@...ux.intel.com,
	torvalds@...ux-foundation.org
Subject: Re: [PATCH 3/4] scheduler: replace migration_thread with cpu_stop

On Thu, 2010-04-22 at 18:09 +0200, Tejun Heo wrote:
> @@ -2909,7 +2912,9 @@ redo:
>                         }
>                         raw_spin_unlock_irqrestore(&busiest->lock, flags);
>                         if (active_balance)
> -                               wake_up_process(busiest->migration_thread);
> +                               stop_one_cpu_nowait(cpu_of(busiest),
> +                                       active_load_balance_cpu_stop, busiest,
> +                                       &busiest->active_balance_work); 

So who guarantees busiest->active_balance_work isn't already enqueued by
some other cpu's load-balancer run?


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