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| author | Mel Gorman <mgorman@techsingularity.net> | 2015-11-06 16:28:34 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2015-11-06 17:50:42 -0800 |
| commit | 974a786e63c96a2401a78ddba926f34c128474f1 (patch) | |
| tree | c3551fdc6208bc2f764455cb73ad676a965a17e0 /include/linux/mmzone.h | |
| parent | f77cf4e4cc9d40310a7224a1a67c733aeec78836 (diff) | |
| download | linux-974a786e63c96a2401a78ddba926f34c128474f1.tar.gz linux-974a786e63c96a2401a78ddba926f34c128474f1.tar.bz2 linux-974a786e63c96a2401a78ddba926f34c128474f1.zip | |
mm, page_alloc: remove MIGRATE_RESERVE
MIGRATE_RESERVE preserves an old property of the buddy allocator that
existed prior to fragmentation avoidance -- min_free_kbytes worth of pages
tended to remain contiguous until the only alternative was to fail the
allocation. At the time it was discovered that high-order atomic
allocations relied on this property so MIGRATE_RESERVE was introduced. A
later patch will introduce an alternative MIGRATE_HIGHATOMIC so this patch
deletes MIGRATE_RESERVE and supporting code so it'll be easier to review.
Note that this patch in isolation may look like a false regression if
someone was bisecting high-order atomic allocation failures.
Signed-off-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Christoph Lameter <cl@linux.com>
Cc: David Rientjes <rientjes@google.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Vitaly Wool <vitalywool@gmail.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/mmzone.h')
| -rw-r--r-- | include/linux/mmzone.h | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index 1e88aae329ff..b86cfa3313cf 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -39,8 +39,6 @@ enum { MIGRATE_UNMOVABLE, MIGRATE_MOVABLE, MIGRATE_RECLAIMABLE, - MIGRATE_PCPTYPES, /* the number of types on the pcp lists */ - MIGRATE_RESERVE = MIGRATE_PCPTYPES, #ifdef CONFIG_CMA /* * MIGRATE_CMA migration type is designed to mimic the way @@ -63,6 +61,8 @@ enum { MIGRATE_TYPES }; +#define MIGRATE_PCPTYPES (MIGRATE_RECLAIMABLE+1) + #ifdef CONFIG_CMA # define is_migrate_cma(migratetype) unlikely((migratetype) == MIGRATE_CMA) #else @@ -429,12 +429,6 @@ struct zone { const char *name; - /* - * Number of MIGRATE_RESERVE page block. To maintain for just - * optimization. Protected by zone->lock. - */ - int nr_migrate_reserve_block; - #ifdef CONFIG_MEMORY_ISOLATION /* * Number of isolated pageblock. It is used to solve incorrect |