Commit 39bbcb8f authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
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[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: default avatarChristoph Lameter <>
Signed-off-by: default avatarAndrew Morton <>
Signed-off-by: default avatarLinus Torvalds <>
parent 006d22d9
......@@ -633,7 +633,7 @@ static int rmqueue_bulk(struct zone *zone, unsigned int order,
* 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))
pset = zone_pcp(zone, smp_processor_id());
for (i = 0; i < ARRAY_SIZE(pset->pcp); i++) {
struct per_cpu_pages *pcp;
......@@ -321,6 +321,9 @@ void refresh_cpu_vm_stats(int cpu)
for_each_zone(zone) {
struct per_cpu_pageset *pcp;
if (!populated_zone(zone))
pcp = zone_pcp(zone, cpu);
for (i = 0; i < NR_VM_ZONE_STAT_ITEMS; i++)
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