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authorVlastimil Babka <vbabka@suse.cz>2013-09-11 14:22:30 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-09-11 15:58:00 -0700
commit1ebb7cc6a58321a4b22c4c9097b4651b0ab859d0 (patch)
treee7742f1bd9a86d9165af70c7a7e773f4e4d85b3a /mm
parent7225522bb429a2f7dae6667e533e2d735b4882d0 (diff)
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mm: munlock: batch NR_MLOCK zone state updates
Depending on previous batch which introduced batched isolation in munlock_vma_range(), we can batch also the updates of NR_MLOCK page stats. After the whole pagevec is processed for page isolation, the stats are updated only once with the number of successful isolations. There were however no measurable perfomance gains. Signed-off-by: Vlastimil Babka <vbabka@suse.cz> Reviewed-by: Jörn Engel <joern@logfs.org> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Michel Lespinasse <walken@google.com> Cc: Hugh Dickins <hughd@google.com> Cc: Rik van Riel <riel@redhat.com> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/mlock.c6
1 files changed, 3 insertions, 3 deletions
diff --git a/mm/mlock.c b/mm/mlock.c
index b3b4a78b7802..b1a7c8007c89 100644
--- a/mm/mlock.c
+++ b/mm/mlock.c
@@ -241,6 +241,7 @@ static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
{
int i;
int nr = pagevec_count(pvec);
+ int delta_munlocked = -nr;
/* Phase 1: page isolation */
spin_lock_irq(&zone->lru_lock);
@@ -251,9 +252,6 @@ static void __munlock_pagevec(struct pagevec *pvec, struct zone *zone)
struct lruvec *lruvec;
int lru;
- /* we have disabled interrupts */
- __mod_zone_page_state(zone, NR_MLOCK, -1);
-
if (PageLRU(page)) {
lruvec = mem_cgroup_page_lruvec(page, zone);
lru = page_lru(page);
@@ -275,8 +273,10 @@ skip_munlock:
*/
pvec->pages[i] = NULL;
put_page(page);
+ delta_munlocked++;
}
}
+ __mod_zone_page_state(zone, NR_MLOCK, delta_munlocked);
spin_unlock_irq(&zone->lru_lock);
/* Phase 2: page munlock and putback */