From 39bbcb8f88154c4ac9853baf3f1134af4c987517 Mon Sep 17 00:00:00 2001
From: Christoph Lameter <clameter@sgi.com>
Date: Mon, 25 Sep 2006 23:31:49 -0700
Subject: [PATCH] [PATCH] mm: do not check unpopulated zones for draining and
counter updates
If a zone is unpopulated then we do not need to check for pages that are to
be drained and also not for vm counters that may need to be updated.
Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
mm/page_alloc.c | 5 ++++-
mm/vmstat.c | 3 +++
2 files changed, 7 insertions(+), 1 deletion(-)
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index cc64830475676..f7ea020c23ea8 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -633,7 +633,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
#ifdef CONFIG_NUMA
/*
* Called from the slab reaper to drain pagesets on a particular node that
- * belong to the currently executing processor.
+ * belongs to the currently executing processor.
* Note that this function must be called with the thread pinned to
* a single processor.
*/
@@ -647,6 +647,9 @@ void drain_node_pages(int nodeid)
struct zone *zone = NODE_DATA(nodeid)->node_zones + z;
struct per_cpu_pageset *pset;
+ if (!populated_zone(zone))
+ continue;
+
pset = zone_pcp(zone, smp_processor_id());
for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) {
struct per_cpu_pages *pcp;
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 04a9093f649eb..968c0072e19a1 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -321,6 +321,9 @@ void refresh_cpu_vm_stats(int cpu)
for_each_zone(zone) {
struct per_cpu_pageset *pcp;
+ if (!populated_zone(zone))
+ continue;
+
pcp = zone_pcp(zone, cpu);
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
--
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