linux-kernel - Re: CMA and zone watermarks

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Message-id: <507371DA.9080309@samsung.com>
Date:	Tue, 09 Oct 2012 02:37:46 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	Rabin Vincent <rabin@....in>
Cc:	linux-mm@...ck.org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: CMA and zone watermarks

Hello,

On 10/8/2012 5:41 PM, Rabin Vincent wrote:

> It appears that when CMA is enabled, the zone watermarks are not properly
> respected, leading to for example GFP_NOWAIT allocations getting access to the
> high pools.
>
> I ran the following test code which simply allocates pages with GFP_NOWAIT
> until it fails, and then tries GFP_ATOMIC.  Without CMA, the GFP_ATOMIC
> allocation succeeds, with CMA, it fails too.

Could You run your test with latest linux-next kernel? There have been 
some patches merged to akpm tree which should fix accounting for free 
and free cma pages. I hope it should fix this issue.

Best regards
-- 
Marek Szyprowski
Samsung Poland R&D Center
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