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Subject[PATCH] mm: clear pages_scanned only if draining a pcp adds pages to the buddy allocator again
Date
From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>

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.

Cc: David Rientjes <rientjes@google.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Minchan Kim <minchan.kim@gmail.com>
Cc: Wu Fengguang <fengguang.wu@intel.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
---
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 5716b00..4e7059d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1157,8 +1157,10 @@ 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
@@ -3914,7 +3916,8 @@ 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);
}
--
1.7.1


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