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Date:	Thu, 20 Dec 2012 11:21:34 +0100 (CET)
From:	Jiri Kosina <>
To:	Mel Gorman <>,
	Andrew Morton <>,
	Rik van Riel <>,
	Minchan Kim <>,
	KAMEZAWA Hiroyuki <>
Subject: [PATCH] mm: compaction: count compaction events only if compaction
 is enabled

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 <>
 mm/compaction.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)

diff --git a/mm/compaction.c b/mm/compaction.c
index 5ad7f4f..ca4cd82 100644
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -303,9 +303,11 @@ static unsigned long isolate_freepages_block(struct compact_control *cc,
 	if (blockpfn == end_pfn)
 		update_pageblock_skip(cc, valid_page, total_isolated, false);
 	count_vm_events(COMPACTFREE_SCANNED, nr_scanned);
 	if (total_isolated)
 		count_vm_events(COMPACTISOLATED, total_isolated);
 	return total_isolated;
@@ -613,9 +615,11 @@ next_pageblock:
 	trace_mm_compaction_isolate_migratepages(nr_scanned, nr_isolated);
 	count_vm_events(COMPACTMIGRATE_SCANNED, nr_scanned);
 	if (nr_isolated)
 		count_vm_events(COMPACTISOLATED, nr_isolated);
 	return low_pfn;

Jiri Kosina
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