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authorMel Gorman <mel@csn.ul.ie>2007-10-16 01:25:52 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-10-16 09:43:00 -0700
commite12ba74d8ff3e2f73a583500d7095e406df4d093 (patch)
treea0d3385b65f0b3e1e00b0bbf11b75e7538a93edb /mm/page_alloc.c
parentc361be55b3128474aa66d31092db330b07539103 (diff)
downloadblackbird-op-linux-e12ba74d8ff3e2f73a583500d7095e406df4d093.tar.gz
blackbird-op-linux-e12ba74d8ff3e2f73a583500d7095e406df4d093.zip
Group short-lived and reclaimable kernel allocations
This patch marks a number of allocations that are either short-lived such as network buffers or are reclaimable such as inode allocations. When something like updatedb is called, long-lived and unmovable kernel allocations tend to be spread throughout the address space which increases fragmentation. This patch groups these allocations together as much as possible by adding a new MIGRATE_TYPE. The MIGRATE_RECLAIMABLE type is for allocations that can be reclaimed on demand, but not moved. i.e. they can be migrated by deleting them and re-reading the information from elsewhere. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Cc: Andy Whitcroft <apw@shadowen.org> Cc: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c10
1 files changed, 7 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index d575a3ee8dd8..29f4de1423c9 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -172,7 +172,10 @@ static void set_pageblock_migratetype(struct page *page, int migratetype)
static inline int gfpflags_to_migratetype(gfp_t gfp_flags)
{
- return ((gfp_flags & __GFP_MOVABLE) != 0);
+ WARN_ON((gfp_flags & GFP_MOVABLE_MASK) == GFP_MOVABLE_MASK);
+
+ return (((gfp_flags & __GFP_MOVABLE) != 0) << 1) |
+ ((gfp_flags & __GFP_RECLAIMABLE) != 0);
}
#else
@@ -676,8 +679,9 @@ static int prep_new_page(struct page *page, int order, gfp_t gfp_flags)
* the free lists for the desirable migrate type are depleted
*/
static int fallbacks[MIGRATE_TYPES][MIGRATE_TYPES-1] = {
- [MIGRATE_UNMOVABLE] = { MIGRATE_MOVABLE },
- [MIGRATE_MOVABLE] = { MIGRATE_UNMOVABLE },
+ [MIGRATE_UNMOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_MOVABLE },
+ [MIGRATE_RECLAIMABLE] = { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE },
+ [MIGRATE_MOVABLE] = { MIGRATE_RECLAIMABLE, MIGRATE_UNMOVABLE },
};
/*
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