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authorMel Gorman <mel@csn.ul.ie>2009-06-16 15:31:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:33 -0700
commit49255c619fbd482d704289b5eb2795f8e3b7ff2e (patch)
treeb1f36ca46bda7767fce12bc4a70360a68f7255ab
parent11e33f6a55ed7847d9c8ffe185ef87faf7806abe (diff)
page allocator: move check for disabled anti-fragmentation out of fastpath
On low-memory systems, anti-fragmentation gets disabled as there is nothing it can do and it would just incur overhead shuffling pages between lists constantly. Currently the check is made in the free page fast path for every page. This patch moves it to a slow path. On machines with low memory, there will be small amount of additional overhead as pages get shuffled between lists but it should quickly settle. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--include/linux/mmzone.h3
-rw-r--r--mm/page_alloc.c4
2 files changed, 4 insertions, 3 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index a47c879e130..0aa4445b0b8 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -50,9 +50,6 @@ extern int page_group_by_mobility_disabled;
static inline int get_pageblock_migratetype(struct page *page)
{
- if (unlikely(page_group_by_mobility_disabled))
- return MIGRATE_UNMOVABLE;
-
return get_pageblock_flags_group(page, PB_migrate, PB_migrate_end);
}
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 512bf9a618c..b09859629e9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -168,6 +168,10 @@ int page_group_by_mobility_disabled __read_mostly;
static void set_pageblock_migratetype(struct page *page, int migratetype)
{
+
+ if (unlikely(page_group_by_mobility_disabled))
+ migratetype = MIGRATE_UNMOVABLE;
+
set_pageblock_flags_group(page, (unsigned long)migratetype,
PB_migrate, PB_migrate_end);
}