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authorJohannes Weiner <hannes@cmpxchg.org>2011-08-04 03:21:09 +0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-08-04 04:25:21 +0400
commit3dab1bce8e840606e76f1bad5a009328e2aa35c7 (patch)
treeab2b3a8f159497ec22bb9c98445a214116e86b4e /include/linux/gfp.h
parentf7b9fcbbc3b8593ff7dc587f90c2fe90a2fd1e6f (diff)
downloadlinux-3dab1bce8e840606e76f1bad5a009328e2aa35c7.tar.xz
mm: page_alloc: increase __GFP_BITS_SHIFT to include __GFP_OTHER_NODE
__GFP_OTHER_NODE is used for NUMA allocations on behalf of other nodes. It's supposed to be passed through from the page allocator to zone_statistics(), but it never gets there as gfp_allowed_mask is not wide enough and masks out the flag early in the allocation path. The result is an accounting glitch where successful NUMA allocations by-agent are not properly attributed as local. Increase __GFP_BITS_SHIFT so that it includes __GFP_OTHER_NODE. Signed-off-by: Johannes Weiner <hannes@cmpxchg.org> Acked-by: Andi Kleen <ak@linux.intel.com> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Acked-by: Mel Gorman <mgorman@suse.de> Reviewed-by: Michal Hocko <mhocko@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/gfp.h')
-rw-r--r--include/linux/gfp.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/gfp.h b/include/linux/gfp.h
index cb4089254f01..3a76faf6a3ee 100644
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -92,7 +92,7 @@ struct vm_area_struct;
*/
#define __GFP_NOTRACK_FALSE_POSITIVE (__GFP_NOTRACK)
-#define __GFP_BITS_SHIFT 23 /* Room for 23 __GFP_FOO bits */
+#define __GFP_BITS_SHIFT 24 /* Room for N __GFP_FOO bits */
#define __GFP_BITS_MASK ((__force gfp_t)((1 << __GFP_BITS_SHIFT) - 1))
/* This equals 0, but use constants in case they ever change */