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cma: fix counting of isolated pages

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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 <[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 authored and Linus Torvalds committed 2012-10-09 16:22:44 +09:00
1 parent 770c8aaaf6
commit 2139cbe627
2 files changed
+16 -5
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mm/page_alloc.c
+7 -2
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,
mm/page_isolation.c
+9 -3
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);