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Date:	Thu, 20 Dec 2012 10:52:14 +0000
From:	Mel Gorman <>
To:	Jiri Kosina <>
Cc:	Andrew Morton <>,
	Rik van Riel <>,
	Minchan Kim <>,
	KAMEZAWA Hiroyuki <>,,
Subject: Re: [PATCH] mm: compaction: count compaction events only if
 compaction is enabled

On Thu, Dec 20, 2012 at 11:21:34AM +0100, Jiri Kosina wrote:
> On configs which have CONFIG_CMA but no CONFIG_COMPACTION, 
> isolate_migratepages_range() and isolate_freepages_block() must not 
> account for COMPACTFREE_SCANNED and COMPACTISOLATED events (those 
> constants are even undefined in such case, causing a build error).
> Signed-off-by: Jiri Kosina <>

Minchan has a similar patch in the works that defines count_compact_events()
similar to count_vm_numa_events(). It just needs a small correction. The
fixed version would avoid having an #ifdef in the middle of the function
which is cosmetically a bit nicer.

Mel Gorman
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