diff options
| author | Marek Szyprowski <m.szyprowski@samsung.com> | 2012-12-11 16:02:57 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-11 17:22:27 -0800 |
| commit | 2e30abd1730751d58463d88bc0844ab8fd7112a9 (patch) | |
| tree | e87bb4b492c1b504dbf5d250fca738e6bdafad12 | |
| parent | e1e12d2f3104be886073ac6c5c4678f30b1b9e51 (diff) | |
| download | linux-2e30abd1730751d58463d88bc0844ab8fd7112a9.tar.bz2 | |
mm: cma: skip watermarks check for already isolated blocks in split_free_page()
Since commit 2139cbe627b8 ("cma: fix counting of isolated pages") free
pages in isolated pageblocks are not accounted to NR_FREE_PAGES counters,
so watermarks check is not required if one operates on a free page in
isolated pageblock.
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Mel Gorman <mel@csn.ul.ie>
Acked-by: Michal Nazarewicz <mina86@mina86.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | mm/page_alloc.c | 17 |
1 files changed, 9 insertions, 8 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index d9fbac1b5030..265fea4fbc81 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1394,21 +1394,22 @@ int capture_free_page(struct page *page, int alloc_order, int migratetype) zone = page_zone(page); order = page_order(page); + mt = get_pageblock_migratetype(page); - /* Obey watermarks as if the page was being allocated */ - watermark = low_wmark_pages(zone) + (1 << order); - if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) - return 0; + if (mt != MIGRATE_ISOLATE) { + /* Obey watermarks as if the page was being allocated */ + watermark = low_wmark_pages(zone) + (1 << order); + if (!zone_watermark_ok(zone, 0, watermark, 0, 0)) + return 0; + + __mod_zone_freepage_state(zone, -(1UL << alloc_order), mt); + } /* Remove page from free list */ list_del(&page->lru); zone->free_area[order].nr_free--; rmv_page_order(page); - mt = get_pageblock_migratetype(page); - if (unlikely(mt != MIGRATE_ISOLATE)) - __mod_zone_freepage_state(zone, -(1UL << alloc_order), mt); - if (alloc_order != order) expand(zone, page, alloc_order, order, &zone->free_area[order], migratetype); |