linux-kernel - Re: [PATCH] Fix page_group_by_mobility

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Message-ID: <20131030152511.GQ2400@suse.de>
Date:	Wed, 30 Oct 2013 15:25:11 +0000
From:	Mel Gorman <mgorman@...e.de>
To:	kosaki.motohiro@...il.com
Cc:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	akpm@...ux-foundation.org,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
Subject: Re: [PATCH] Fix page_group_by_mobility_disabled breakage

On Fri, Oct 25, 2013 at 02:09:35PM -0400, kosaki.motohiro@...il.com wrote:
> From: KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
> 
> Currently, set_pageblock_migratetype screw up MIGRATE_CMA and
> MIGRATE_ISOLATE if page_group_by_mobility_disabled is true. It
> rewrite the argument to MIGRATE_UNMOVABLE and we lost these attribute.
> 
> The problem was introduced commit 49255c619f (page allocator: move
> check for disabled anti-fragmentation out of fastpath). So, 4 years
> lived issue may mean that nobody uses page_group_by_mobility_disabled.
> 

Nobody uses page_group_by_mobility_disabled with CMA at least.
page_group_by_mobility_disabled only kicks in automatically for small
machines so it's possible the condition is very rarely encountered.

Anyway

Acked-by: Mel Gorman <mgorman@...e.de>

-- 
Mel Gorman
SUSE Labs
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