diff options
| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2012-07-31 16:42:53 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-07-31 18:42:42 -0700 |
| commit | 2a13515c398bbe471bf64519ada87fd708152ced (patch) | |
| tree | 6167884779ebd978b3889231fdeaf45d4178149a | |
| parent | 3d3727cdb07ff17ddc3c551ef8d03d37b60a0372 (diff) | |
mm: clear pages_scanned only if draining a pcp adds pages to the buddy allocator again
commit 2ff754fa8f ("mm: clear pages_scanned only if draining a pcp adds
pages to the buddy allocator again") fixed one free_pcppages_bulk()
misuse. But two another miuse still exist.
This patch fixes it.
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Acked-by: David Rientjes <rientjes@google.com>
Acked-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Johannes Weiner <hannes@cmpxchg.org>
Reviewed-by: Minchan Kim <minchan@kernel.org>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Reviewed-by: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.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 | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c index 80ef99234b8..18747528eec 100644 --- a/mm/page_alloc.c +++ b/mm/page_alloc.c @@ -1158,8 +1158,10 @@ void drain_zone_pages(struct zone *zone, struct per_cpu_pages *pcp) to_drain = pcp->batch; else to_drain = pcp->count; - free_pcppages_bulk(zone, to_drain, pcp); - pcp->count -= to_drain; + if (to_drain > 0) { + free_pcppages_bulk(zone, to_drain, pcp); + pcp->count -= to_drain; + } local_irq_restore(flags); } #endif @@ -3915,7 +3917,8 @@ static int __zone_pcp_update(void *data) pcp = &pset->pcp; local_irq_save(flags); - free_pcppages_bulk(zone, pcp->count, pcp); + if (pcp->count > 0) + free_pcppages_bulk(zone, pcp->count, pcp); setup_pageset(pset, batch); local_irq_restore(flags); } |