linux-kernel - Re: [RESEND v2 PATCH 1/2] aio, memory-hotplug: Fix confliction when migrating and accessing ring pages.

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Message-ID: <53269B3A.4040900@cn.fujitsu.com>
Date:	Mon, 17 Mar 2014 14:50:34 +0800
From:	Tang Chen <tangchen@...fujitsu.com>
To:	Benjamin LaHaise <bcrl@...ck.org>
CC:	Gu Zheng <guz.fnst@...fujitsu.com>, viro@...iv.linux.org.uk,
	jmoyer@...hat.com, kosaki.motohiro@...il.com,
	kosaki.motohiro@...fujitsu.com, isimatu.yasuaki@...fujitsu.com,
	linux-fsdevel@...r.kernel.org, linux-aio@...ck.org,
	linux-kernel@...r.kernel.org, miaox@...fujitsu.com
Subject: Re: [RESEND v2 PATCH 1/2] aio, memory-hotplug: Fix confliction when
 migrating and accessing ring pages.

On 03/14/2014 11:14 PM, Benjamin LaHaise wrote:
......
>> What about the following patch? It adds additional reference to protect the page
>> avoid being freed when we reading it.
>> ps.It is applied on linux-next(3-13).
>
> I think that's even worse than the spinlock approach since we'll end up
> bouncing around the struct page's cacheline in addition to spinlock we're
> going to end up taking anyways.
>

Hi Benjamin,

I'm sorry, I don't quite understand the cacheline problem you mentioned 
above.
Would you please explain more ?

Thanks.

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