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cma: fix watermark checking

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* Add ALLOC_CMA alloc flag and pass it to [__]zone_watermark_ok()
  (from Minchan Kim).

* During watermark check decrease available free pages number by
  free CMA pages number if necessary (unmovable allocations cannot
  use pages from CMA areas).

Signed-off-by: Bartlomiej Zolnierkiewicz <[email protected]>
Signed-off-by: Kyungmin Park <[email protected]>
Cc: Marek Szyprowski <[email protected]>
Cc: Michal Nazarewicz <[email protected]>
Cc: Minchan Kim <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Hugh Dickins <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2012-10-08 16:32:05 -07:00 • committed by Linus Torvalds
commit d95ea5d18e
3 changed files with 36 additions and 17 deletions
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8
mm/compaction.c
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@ -934,6 +934,7 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
struct zoneref *z;
struct zone *zone;
int rc = COMPACT_SKIPPED;
int alloc_flags = 0;
/* Check if the GFP flags allow compaction */
if (!order || !may_enter_fs || !may_perform_io)
@ -941,6 +942,10 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
count_vm_event(COMPACTSTALL);
#ifdef CONFIG_CMA
if (allocflags_to_migratetype(gfp_mask) == MIGRATE_MOVABLE)
alloc_flags |= ALLOC_CMA;
#endif
/* Compact each zone in the list */
for_each_zone_zonelist_nodemask(zone, z, zonelist, high_zoneidx,
nodemask) {
@ -951,7 +956,8 @@ unsigned long try_to_compact_pages(struct zonelist *zonelist,
rc = max(status, rc);
/* If a normal allocation would succeed, stop compacting */
if (zone_watermark_ok(zone, order, low_wmark_pages(zone), 0, 0))
if (zone_watermark_ok(zone, order, low_wmark_pages(zone), 0,
alloc_flags))
break;
}