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mm: use two zonelist that are filtered by GFP mask

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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 <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Signed-off-by: Lee Schermerhorn <[email protected]>
Cc: KAMEZAWA Hiroyuki <[email protected]>
Cc: Mel Gorman <[email protected]>
Cc: Christoph Lameter <[email protected]>
Cc: Hugh Dickins <[email protected]>
Cc: Nick Piggin <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Mel Gorman 2008-04-28 02:12:16 -07:00 • committed by Linus Torvalds
commit 54a6eb5c47
10 changed files with 168 additions and 154 deletions
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8
mm/slub.c
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@ -1285,6 +1285,8 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
#ifdef CONFIG_NUMA
struct zonelist *zonelist;
struct zone **z;
struct zone *zone;
enum zone_type high_zoneidx = gfp_zone(flags);
struct page *page;
/*
@ -1310,12 +1312,12 @@ static struct page *get_any_partial(struct kmem_cache *s, gfp_t flags)
return NULL;
zonelist = node_zonelist(slab_node(current->mempolicy), flags);
for (z = zonelist->zones; *z; z++) {
for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
struct kmem_cache_node *n;
n = get_node(s, zone_to_nid(*z));
n = get_node(s, zone_to_nid(zone));
if (n && cpuset_zone_allowed_hardwall(*z, flags) &&
if (n && cpuset_zone_allowed_hardwall(zone, flags) &&
n->nr_partial > MIN_PARTIAL) {
page = get_partial_node(n);
if (page)