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

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Date:	Tue, 10 Apr 2012 10:19:56 -0700
From:	Sandeep Patil <psandeep.s@...il.com>
To:	Aaro Koskinen <aaro.koskinen@...ia.com>
Cc:	Marek Szyprowski <m.szyprowski@...sung.com>,
	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

>>
>> 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

Sandeep
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