linux-kernel - RE: [PATCHv24 00/16] Contiguous Memory Allocator

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Message-id: <00c201cd17af$17a3aa50$46eafef0$%szyprowski@samsung.com>
Date:	Wed, 11 Apr 2012 08:48:24 +0200
From:	Marek Szyprowski <m.szyprowski@...sung.com>
To:	'Sandeep Patil' <psandeep.s@...il.com>,
	'Aaro Koskinen' <aaro.koskinen@...ia.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, 'Ohad Ben-Cohen' <ohad@...ery.com>,
	'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>,
	'Chunsang Jeong' <chunsang.jeong@...aro.org>,
	'Michal Nazarewicz' <mina86@...a86.com>,
	'Dave Hansen' <dave@...ux.vnet.ibm.com>,
	'Jesse Barker' <jesse.barker@...aro.org>,
	'Kyungmin Park' <kyungmin.park@...sung.com>,
	'Benjamin Gaignard' <benjamin.gaignard@...aro.org>,
	'Andrew Morton' <akpm@...ux-foundation.org>,
	'Rob Clark' <rob.clark@...aro.org>,
	'KAMEZAWA Hiroyuki' <kamezawa.hiroyu@...fujitsu.com>
Subject: RE: [PATCHv24 00/16] Contiguous Memory Allocator

Hi,

On Tuesday, April 10, 2012 7:20 PM Sandeep Patil wrote:

> >> This is (yet another) update of CMA patches.
> >
> >
> > How well CMA is supposed to work if you have mlocked processes? I've
> > been testing these patches, and noticed that by creating a small mlocked
> > process you start to get plenty of test_pages_isolated() failure warnings,
> > and bigger allocations will always fail.
> 
> CMIIW, I think mlocked pages are never migrated. The reason is because
> __isolate_lru_pages() does not isolate Unevictable pages right now.
> 
> Minchan added support to allow this but the patch was dropped.
> 
> See the discussion at : https://lkml.org/lkml/2011/8/29/295

Right, we are aware of this limitation. We are working on solving it but we didn't 
consider it a blocker for the core CMA patches. Such issues can be easily fixed with 
the incremental patches.

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


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