linux-kernel - Re: [PATCH 01/10] zcache: fix preemptable memory allocation in atomic context

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Message-ID: <4FE13ACA.7090301@linux.vnet.ibm.com>
Date:	Wed, 20 Jun 2012 10:51:54 +0800
From:	Xiao Guangrong <xiaoguangrong@...ux.vnet.ibm.com>
To:	Seth Jennings <sjenning@...ux.vnet.ibm.com>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Dan Magenheimer <dan.magenheimer@...cle.com>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 01/10] zcache: fix preemptable memory allocation in atomic
 context

On 06/19/2012 10:26 PM, Seth Jennings wrote:


> Did you get a might_sleep warning on this?  I haven't seen this being an
> issue.
> 


No, i did not, i get it just from code review.

> GFP_ATOMIC only modifies the existing mask to allow allocation use the
> emergency pool.  It is __GFP_WAIT not being set that prevents sleep.  We
> don't want to use the emergency pool since we make large, long lived
> allocations with this mask.
> 


Ah, yes, i thought only GFP_ATOMIC can prevent sleep, thank you very much
for pointing it out.

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