linux-kernel - Re: [Linaro-mm-sig] [PATCH 11/15] mm: trigger page reclaim in alloc_contig

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Message-ID: <op.v9cr9sqm3l0zgt@mpn-glaptop>
Date:	Wed, 08 Feb 2012 10:21:18 +0100
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	"Mel Gorman" <mel@....ul.ie>,
	"sandeep patil" <psandeep.s@...il.com>
Cc:	"Marek Szyprowski" <m.szyprowski@...sung.com>,
	"Ohad Ben-Cohen" <ohad@...ery.com>,
	"Daniel Walker" <dwalker@...eaurora.org>,
	"Russell King" <linux@....linux.org.uk>,
	"Arnd Bergmann" <arnd@...db.de>,
	"Jesse Barker" <jesse.barker@...aro.org>,
	"Jonathan Corbet" <corbet@....net>, linux-kernel@...r.kernel.org,
	"Dave Hansen" <dave@...ux.vnet.ibm.com>,
	linaro-mm-sig@...ts.linaro.org, linux-mm@...ck.org,
	"Kyungmin Park" <kyungmin.park@...sung.com>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"Rob Clark" <rob.clark@...aro.org>,
	linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org
Subject: Re: [Linaro-mm-sig] [PATCH 11/15] mm: trigger page reclaim in
 alloc_contig_range() to stabilize watermarks

On Wed, 08 Feb 2012 03:04:18 +0100, sandeep patil <psandeep.s@...il.com> wrote:
> There's another problem I am facing with zone watermarks and CMA.
>
> Test details:
> Memory  : 480 MB of total memory, 128 MB CMA region
> Test case : around 600 MB of file transfer over USB RNDIS onto target
> System Load : ftpd with console running on target.
> No one is doing CMA allocations except for the DMA allocations done by the
> drivers.
>
> Result : After about 300MB transfer, I start getting GFP_ATOMIC
> allocation failures.  This only happens if CMA region is reserved.

[...]

> Total memory available is way above the zone watermarks. So, we ended
> up starving
> UNMOVABLE/RECLAIMABLE atomic allocations that cannot fallback on CMA region.

This looks like something Mel warned me about.  I don't really have a good
solution for that yet. ;/

-- 
Best regards,                                         _     _
.o. | Liege of Serenely Enlightened Majesty of      o' \,=./ `o
..o | Computer Science,  Michał “mina86” Nazarewicz    (o o)
ooo +----<email/xmpp: mpn@...gle.com>--------------ooO--(_)--Ooo--
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