linux-kernel - Re: [PATCH 1/2] null_blk: prevent timer handler running on a different CPU where started

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Date:	Tue, 2 Jun 2015 08:44:09 -0600
From:	Jens Axboe <axboe@...com>
To:	Akinobu Mita <akinobu.mita@...il.com>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/2] null_blk: prevent timer handler running on a different
 CPU where started

On 06/01/2015 05:35 PM, Akinobu Mita wrote:
> When irqmode=2 (IRQ completion handler is timer), timer handler should
> be called on the same CPU where the timer has been started.
>
> Since completion_queues are per-cpu and the completion handler only
> touches completion_queue for local CPU, we need to prevent the handler
> from running on a different CPU where the timer has been started.
> Otherwise, the IO cannot be completed until another completion handler
> is executed on that CPU.

Thanks, applied this and 2/2, the latter seems to have been forgotten 
after our initial discussion about it.

-- 
Jens Axboe

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