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authorMel Gorman <mel@csn.ul.ie>2008-04-28 02:12:16 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:18 -0700
commit54a6eb5c4765aa573a030ceeba2c14e3d2ea5706 (patch)
tree547176a090beb787722a153cf2b8b942dc0e68db /mm/slab.c
parent18ea7e710d2452fa726814a406779188028cf1bf (diff)
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>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c8
1 files changed, 5 insertions, 3 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 5488c54b117..29851841da6 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -3243,6 +3243,8 @@ static void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
struct zonelist *zonelist;
gfp_t local_flags;
struct zone **z;
+ struct zone *zone;
+ enum zone_type high_zoneidx = gfp_zone(flags);
void *obj = NULL;
int nid;
@@ -3257,10 +3259,10 @@ retry:
* Look through allowed nodes for objects available
* from existing per node queues.
*/
- for (z = zonelist->zones; *z && !obj; z++) {
- nid = zone_to_nid(*z);
+ for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
+ nid = zone_to_nid(zone);
- if (cpuset_zone_allowed_hardwall(*z, flags) &&
+ if (cpuset_zone_allowed_hardwall(zone, flags) &&
cache->nodelists[nid] &&
cache->nodelists[nid]->free_objects)
obj = ____cache_alloc_node(cache,