From: Marek Szyprowski <m.szyprowski@samsung.com>
To: Rabin Vincent <rabin@rab.in>
Cc: linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: CMA and zone watermarks
Date: Tue, 09 Oct 2012 02:37:46 +0200 [thread overview]
Message-ID: <507371DA.9080309@samsung.com> (raw)
In-Reply-To: <CAH+eYFCJTtF+FeqKs_ho5yyX0tkUBoaa-yfsd1rVshcQ5Xxp=A@mail.gmail.com>
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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next prev parent reply other threads:[~2012-10-09 0:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-08 15:41 Rabin Vincent
2012-10-09 0:37 ` Marek Szyprowski [this message]
2012-10-09 15:25 ` Rabin Vincent
2012-10-09 3:10 ` Minchan Kim
2012-10-09 3:12 ` Marek Szyprowski
2012-10-09 4:43 ` Minchan Kim
2012-10-09 4:53 ` Marek Szyprowski
2012-10-09 5:07 ` Minchan Kim
2012-10-09 5:16 ` Marek Szyprowski
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