linux-kernel - Re: [Bug #14141] order 2 page allocation failures in iwlagn

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Date:	Thu, 15 Oct 2009 22:15:09 +0200
From:	Frans Pop <elendil@...net.nl>
To:	Mel Gorman <mel@....ul.ie>
Cc:	David Rientjes <rientjes@...gle.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Kernel Testers List <kernel-testers@...r.kernel.org>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Reinette Chatre <reinette.chatre@...el.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	Karol Lewandowski <karol.k.lewandowski@...il.com>,
	Mohamed Abbas <mohamed.abbas@...el.com>,
	"John W. Linville" <linville@...driver.com>, linux-mm@...ck.org
Subject: Re: [Bug #14141] order 2 page allocation failures in iwlagn

On Thursday 15 October 2009, Mel Gorman wrote:
> After a lot more eyeballing, the best next candidate within mm is the
> following patch. Should be tested on it's own and in combination with
> the wakeup-kswapd patch sent before.
>
> From 4e8b5217f51a00caee527e4e8d8e46fe9f82b482 Mon Sep 17 00:00:00 2001
> From: Mel Gorman <mel@....ul.ie>
> Date: Thu, 15 Oct 2009 00:17:05 +0100
> Subject: [PATCH] page allocator: Direct reclaim should always obey
> watermarks
>
> ALLOC_NO_WATERMARKS should be cleared when trying to allocate from the
> free-lists after a direct reclaim.

I've tested the two patches together and this seems like a definite
improvement. I still get SKB errors on the first test, but the desktop
freezes are a lot shorter and the total time needed to load the 3rd gitk
goes down from ~2:15 to ~1:15. The counter in gitk of the number of
loaded commits goes up visibly faster and with fewer halts.

This is on top of current mainline with the RX_LOW_WATERMARK in iwlagn
at it's current value (8).

Here are the allocation failures for 2 consecutive tests. Note that the
first test still shows quite a lot of failures, but the second test hardly
had any at all (I still had music skips though).

[  232.845116] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
[  232.845116] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
[  232.873009] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
[  232.884545] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
[  240.121577] __ratelimit: 26 callbacks suppressed
[  240.121634] __ratelimit: 6 callbacks suppressed
[  240.124006] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 6 free buffers remaining.
[  304.335767] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
[  304.335767] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
[  304.374729] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.
[  309.446481] __ratelimit: 5 callbacks suppressed
[  309.450197] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 0 free buffers remaining.

[  525.912934] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 5 free buffers remaining.
[  525.953939] iwlagn 0000:10:00.0: Failed to allocate SKB buffer with GFP_ATOMIC. Only 7 free buffers remaining.
[  536.058171] __ratelimit: 1 callbacks suppressed

Thanks,
FJP
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