linux-kernel - Re: [PATCH 2/4] tracing, mm: Add trace events for anti-fragmentation falling back to other migratetypes

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Date:	Wed, 29 Jul 2009 21:39:53 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
CC:	Larry Woodman <lwoodman@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Peter Zijlstra <peterz@...radead.org>,
	LKML <linux-kernel@...r.kernel.org>, linux-mm@...ck.org
Subject: Re: [PATCH 2/4] tracing, mm: Add trace events for anti-fragmentation
 falling back to other migratetypes

Mel Gorman wrote:
> Fragmentation avoidance depends on being able to use free pages from
> lists of the appropriate migrate type. In the event this is not
> possible, __rmqueue_fallback() selects a different list and in some
> circumstances change the migratetype of the pageblock. Simplistically,
> the more times this event occurs, the more likely that fragmentation
> will be a problem later for hugepage allocation at least but there are
> other considerations such as the order of page being split to satisfy
> the allocation.

Acked-by: Rik van Riel <riel@...hat.com>

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