mm: use two zonelist that are filtered by GFP mask
Currently a node has two sets of zonelists, one for each zone type in the
system and a second set for GFP_THISNODE allocations. Based on the zones
allowed by a gfp mask, one of these zonelists is selected. All of these
zonelists consume memory and occupy cache lines.
This patch replaces the multiple zonelists per-node with two zonelists. The
first contains all populated zones in the system, ordered by distance, for
fallback allocations when the target/preferred node has no free pages. The
second contains all populated zones in the node suitable for GFP_THISNODE
allocations.
An iterator macro is introduced called for_each_zone_zonelist() that interates
through each zone allowed by the GFP flags in the selected zonelist.
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <clameter@sgi.com>
Cc: Hugh Dickins <hugh@veritas.com>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/mm/vmscan.c b/mm/vmscan.c
index ef8551e..0515b8f 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -1249,15 +1249,13 @@
static unsigned long shrink_zones(int priority, struct zonelist *zonelist,
struct scan_control *sc)
{
+ enum zone_type high_zoneidx = gfp_zone(sc->gfp_mask);
unsigned long nr_reclaimed = 0;
- struct zone **zones = zonelist->zones;
- int i;
-
+ struct zone **z;
+ struct zone *zone;
sc->all_unreclaimable = 1;
- for (i = 0; zones[i] != NULL; i++) {
- struct zone *zone = zones[i];
-
+ for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
if (!populated_zone(zone))
continue;
/*
@@ -1311,8 +1309,9 @@
unsigned long nr_reclaimed = 0;
struct reclaim_state *reclaim_state = current->reclaim_state;
unsigned long lru_pages = 0;
- struct zone **zones = zonelist->zones;
- int i;
+ struct zone **z;
+ struct zone *zone;
+ enum zone_type high_zoneidx = gfp_zone(gfp_mask);
if (scan_global_lru(sc))
count_vm_event(ALLOCSTALL);
@@ -1320,8 +1319,7 @@
* mem_cgroup will not do shrink_slab.
*/
if (scan_global_lru(sc)) {
- for (i = 0; zones[i] != NULL; i++) {
- struct zone *zone = zones[i];
+ for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
continue;
@@ -1385,8 +1383,7 @@
priority = 0;
if (scan_global_lru(sc)) {
- for (i = 0; zones[i] != NULL; i++) {
- struct zone *zone = zones[i];
+ for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
continue;