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authorRik van Riel <riel@redhat.com>2011-01-13 15:47:13 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2011-01-13 17:32:46 -0800
commit2c888cfbc1b45508a44763d85ba2e8ac43faff5f (patch)
tree9a7f2214e5d6a01d5724ae63d4d50cddeb2293ff /mm/huge_memory.c
parent97562cd243298acf573620c764a1037bd545c9bc (diff)
downloadlinux-2c888cfbc1b45508a44763d85ba2e8ac43faff5f.tar.bz2
thp: fix anon memory statistics with transparent hugepages
Count each transparent hugepage as HPAGE_PMD_NR pages in the LRU statistics, so the Active(anon) and Inactive(anon) statistics in /proc/meminfo are correct. Signed-off-by: Rik van Riel <riel@redhat.com> Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/huge_memory.c')
-rw-r--r--mm/huge_memory.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index 892d8a17a7e5..f4f6041176a4 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -1143,6 +1143,7 @@ static void __split_huge_page_refcount(struct page *page)
int i;
unsigned long head_index = page->index;
struct zone *zone = page_zone(page);
+ int zonestat;
/* prevent PageLRU to go away from under us, and freeze lru stats */
spin_lock_irq(&zone->lru_lock);
@@ -1207,6 +1208,15 @@ static void __split_huge_page_refcount(struct page *page)
__dec_zone_page_state(page, NR_ANON_TRANSPARENT_HUGEPAGES);
__mod_zone_page_state(zone, NR_ANON_PAGES, HPAGE_PMD_NR);
+ /*
+ * A hugepage counts for HPAGE_PMD_NR pages on the LRU statistics,
+ * so adjust those appropriately if this page is on the LRU.
+ */
+ if (PageLRU(page)) {
+ zonestat = NR_LRU_BASE + page_lru(page);
+ __mod_zone_page_state(zone, zonestat, -(HPAGE_PMD_NR-1));
+ }
+
ClearPageCompound(page);
compound_unlock(page);
spin_unlock_irq(&zone->lru_lock);