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cma: fix counting of isolated pages 

Isolated free pages shouldn't be accounted to NR_FREE_PAGES counter.  Fix
it by properly decreasing/increasing NR_FREE_PAGES counter in
set_migratetype_isolate()/unset_migratetype_isolate() and removing counter
adjustment for isolated pages from free_one_page() and split_free_page().

Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>
Cc: Michal Nazarewicz <mina86@mina86.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Mel Gorman <mgorman@suse.de>
Cc: Hugh Dickins <hughd@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2012-10-08 16:32:00 -07:00 committed by Linus Torvalds
parent 770c8aaaf6
commit 2139cbe627
2 changed files with 16 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
mm/page_alloc.c
View File

@ -691,7 +691,8 @@ static void free_one_page(struct zone *zone, struct page *page, int order,
zone->pages_scanned = 0;
__free_one_page(page, zone, order, migratetype);
__mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
if (unlikely(migratetype != MIGRATE_ISOLATE))
__mod_zone_page_state(zone, NR_FREE_PAGES, 1 << order);
spin_unlock(&zone->lock);
}
@ -1392,6 +1393,7 @@ int capture_free_page(struct page *page, int alloc_order, int migratetype)
unsigned int order;
unsigned long watermark;
struct zone *zone;
int mt;
BUG_ON(!PageBuddy(page));
@ -1407,7 +1409,10 @@ int capture_free_page(struct page *page, int alloc_order, int migratetype)
list_del(&page->lru);
zone->free_area[order].nr_free--;
rmv_page_order(page);
__mod_zone_page_state(zone, NR_FREE_PAGES, -(1UL << order));
mt = get_pageblock_migratetype(page);
if (unlikely(mt != MIGRATE_ISOLATE))
__mod_zone_page_state(zone, NR_FREE_PAGES, -(1UL << order));
if (alloc_order != order)
expand(zone, page, alloc_order, order,

12
mm/page_isolation.c
View File

@ -76,8 +76,12 @@ int set_migratetype_isolate(struct page *page)
out:
if (!ret) {
unsigned long nr_pages;
set_pageblock_isolate(page);
move_freepages_block(zone, page, MIGRATE_ISOLATE);
nr_pages = move_freepages_block(zone, page, MIGRATE_ISOLATE);
__mod_zone_page_state(zone, NR_FREE_PAGES, -nr_pages);
}
spin_unlock_irqrestore(&zone->lock, flags);
@ -89,12 +93,14 @@ out:
void unset_migratetype_isolate(struct page *page, unsigned migratetype)
{
struct zone *zone;
unsigned long flags;
unsigned long flags, nr_pages;
zone = page_zone(page);
spin_lock_irqsave(&zone->lock, flags);
if (get_pageblock_migratetype(page) != MIGRATE_ISOLATE)
goto out;
move_freepages_block(zone, page, migratetype);
nr_pages = move_freepages_block(zone, page, migratetype);
__mod_zone_page_state(zone, NR_FREE_PAGES, nr_pages);
restore_pageblock_isolate(page, migratetype);
out:
spin_unlock_irqrestore(&zone->lock, flags);