linux-kernel - Re: [Linaro-mm-sig] [PATCHv17 0/11] Contiguous Memory Allocator

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Message-ID: <op.v45u6zyy3l0zgt@mpn-glaptop>
Date:	Fri, 18 Nov 2011 22:26:49 +0100
From:	"Michal Nazarewicz" <mina86@...a86.com>
To:	"Marek Szyprowski" <m.szyprowski@...sung.com>,
	"sandeep patil" <psandeep.s@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-media@...r.kernel.org, linux-mm@...ck.org,
	linaro-mm-sig@...ts.linaro.org,
	"Daniel Walker" <dwalker@...eaurora.org>,
	"Russell King" <linux@....linux.org.uk>,
	"Arnd Bergmann" <arnd@...db.de>,
	"Jonathan Corbet" <corbet@....net>, "Mel Gorman" <mel@....ul.ie>,
	"Dave Hansen" <dave@...ux.vnet.ibm.com>,
	"Jesse Barker" <jesse.barker@...aro.org>,
	"Kyungmin Park" <kyungmin.park@...sung.com>,
	"Ankita Garg" <ankita@...ibm.com>,
	"Andrew Morton" <akpm@...ux-foundation.org>,
	"KAMEZAWA Hiroyuki" <kamezawa.hiroyu@...fujitsu.com>
Subject: Re: [Linaro-mm-sig] [PATCHv17 0/11] Contiguous Memory Allocator

On Fri, 18 Nov 2011 22:20:48 +0100, sandeep patil <psandeep.s@...il.com> wrote:
> I am running a simple test to allocate contiguous regions and write a log on
> in a file on sdcard simultaneously. I can reproduce this migration failure 100%
> times with it.
> when I tracked the pages that failed to migrate, I found them on the
> buffer head lru
> list with a reference held on the buffer_head in the page, which
> causes drop_buffers()
> to fail.
>
> So, i guess my question is, until all the migration failures are
> tracked down and fixed,
> is there a plan to retry the contiguous allocation from a new range in
> the CMA region?

No.  Current CMA implementation will stick to the same range of pages also
on consequent allocations of the same size.

-- 
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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