Commit 39bbcb8f authored by Christoph Lameter's avatar Christoph Lameter Committed by Linus Torvalds
Browse files

[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 <clameter@sgi.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 006d22d9

mm/page_alloc.c

+4 −1
Original line number Diff line number Diff line
@@ -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;

mm/vmstat.c

+3 −0
Original line number Diff line number Diff line
@@ -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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