[PATCH 2/3] Use one zonelist that is filtered instead of multiple zonelists

From: Mel Gorman
Date: Wed Aug 08 2007 - 12:16:28 EST


Currently a node has a number of zonelists, one for each zone type in
the system. Based on the zones allowed by a gfp mask, one of these zonelists
is selected. All of these zonelists occupy memory and consume cache lines.

This patch replaces the multiple zonelists in the node with a single
zonelist that contains all populated zones in the system. An iterator macro
is introduced called for_each_zone_zonelist() interates through each zone
in the zonelist that is allowed by the GFP flags.

Signed-off-by: Mel Gorman <mel@xxxxxxxxx>
---

arch/parisc/mm/init.c | 11 ++-
drivers/char/sysrq.c | 3
fs/buffer.c | 5 -
include/linux/gfp.h | 3
include/linux/mempolicy.h | 2
include/linux/mmzone.h | 33 +++++++++
mm/mempolicy.c | 6 -
mm/oom_kill.c | 8 +-
mm/page_alloc.c | 138 ++++++++++++++++++-----------------------
mm/slab.c | 11 +--
mm/slub.c | 11 +--
mm/vmscan.c | 14 ++--
12 files changed, 133 insertions(+), 112 deletions(-)

diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/arch/parisc/mm/init.c linux-2.6.23-rc1-mm2-010_use_zonelist/arch/parisc/mm/init.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/arch/parisc/mm/init.c 2007-07-22 21:41:00.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/arch/parisc/mm/init.c 2007-08-08 11:35:09.000000000 +0100
@@ -599,15 +599,18 @@ void show_mem(void)
#ifdef CONFIG_DISCONTIGMEM
{
struct zonelist *zl;
- int i, j, k;
+ int i, j;

for (i = 0; i < npmem_ranges; i++) {
+ zl = &NODE_DATA(i)->node_zonelist;
for (j = 0; j < MAX_NR_ZONES; j++) {
- zl = NODE_DATA(i)->node_zonelists + j;
+ struct zone **z;
+ struct zone *zone;

printk("Zone list for zone %d on node %d: ", j, i);
- for (k = 0; zl->zones[k] != NULL; k++)
- printk("[%ld/%s] ", zone_to_nid(zl->zones[k]), zl->zones[k]->name);
+ for_each_zone_zonelist(zone, z, zl, j)
+ printk(KERN_INFO, "[%ld/%s] ",
+ zone_to_nid(zone), zone->name);
printk("\n");
}
}
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/drivers/char/sysrq.c linux-2.6.23-rc1-mm2-010_use_zonelist/drivers/char/sysrq.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/drivers/char/sysrq.c 2007-08-07 14:45:09.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/drivers/char/sysrq.c 2007-08-08 11:36:29.000000000 +0100
@@ -270,8 +270,7 @@ static struct sysrq_key_op sysrq_term_op

static void moom_callback(struct work_struct *ignored)
{
- out_of_memory(&NODE_DATA(0)->node_zonelists[ZONE_NORMAL],
- GFP_KERNEL, 0);
+ out_of_memory(&NODE_DATA(0)->node_zonelist, GFP_KERNEL, 0);
}

static DECLARE_WORK(moom_work, moom_callback);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/fs/buffer.c linux-2.6.23-rc1-mm2-010_use_zonelist/fs/buffer.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/fs/buffer.c 2007-08-07 14:45:10.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/fs/buffer.c 2007-08-08 13:42:03.000000000 +0100
@@ -362,9 +362,10 @@ static void free_more_memory(void)
yield();

for_each_online_pgdat(pgdat) {
- zones = pgdat->node_zonelists[gfp_zone(GFP_NOFS)].zones;
+ zones = first_zones_zonelist(&pgdat->node_zonelist,
+ gfp_zone(GFP_NOFS));
if (*zones)
- try_to_free_pages(zones, 0, GFP_NOFS);
+ try_to_free_pages(&pgdat->node_zonelist, 0, GFP_NOFS);
}
}

diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/include/linux/gfp.h linux-2.6.23-rc1-mm2-010_use_zonelist/include/linux/gfp.h
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/include/linux/gfp.h 2007-08-07 14:45:11.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/include/linux/gfp.h 2007-08-08 11:35:09.000000000 +0100
@@ -175,8 +175,7 @@ static inline struct page *alloc_pages_n
if (nid < 0)
nid = numa_node_id();

- return __alloc_pages(gfp_mask, order,
- NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_mask));
+ return __alloc_pages(gfp_mask, order, &NODE_DATA(nid)->node_zonelist);
}

#ifdef CONFIG_NUMA
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/include/linux/mempolicy.h linux-2.6.23-rc1-mm2-010_use_zonelist/include/linux/mempolicy.h
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/include/linux/mempolicy.h 2007-08-07 14:45:11.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/include/linux/mempolicy.h 2007-08-08 11:35:09.000000000 +0100
@@ -240,7 +240,7 @@ static inline void mpol_fix_fork_child_f
static inline struct zonelist *huge_zonelist(struct vm_area_struct *vma,
unsigned long addr, gfp_t gfp_flags)
{
- return NODE_DATA(0)->node_zonelists + gfp_zone(gfp_flags);
+ return &NODE_DATA(0)->node_zonelist;
}

static inline int do_migrate_pages(struct mm_struct *mm,
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/include/linux/mmzone.h linux-2.6.23-rc1-mm2-010_use_zonelist/include/linux/mmzone.h
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/include/linux/mmzone.h 2007-08-07 14:45:11.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/include/linux/mmzone.h 2007-08-08 13:45:55.000000000 +0100
@@ -469,7 +469,7 @@ extern struct page *mem_map;
struct bootmem_data;
typedef struct pglist_data {
struct zone node_zones[MAX_NR_ZONES];
- struct zonelist node_zonelists[MAX_NR_ZONES];
+ struct zonelist node_zonelist;
int nr_zones;
#ifdef CONFIG_FLAT_NODE_MEM_MAP
struct page *node_mem_map;
@@ -670,6 +670,37 @@ extern struct zone *next_zone(struct zon
zone; \
zone = next_zone(zone))

+/* Returns the first zone at or below highest_zoneidx in a zonelist */
+static inline struct zone **first_zones_zonelist(struct zonelist *zonelist,
+ enum zone_type highest_zoneidx)
+{
+ struct zone **z;
+ for (z = zonelist->zones; *z && zone_idx(*z) > highest_zoneidx; z++);
+ return z;
+}
+
+/* Returns the next zone at or below highest_zoneidx in a zonelist */
+static inline struct zone **next_zones_zonelist(struct zone **z,
+ enum zone_type highest_zoneidx)
+{
+ for (++z; *z && zone_idx(*z) > highest_zoneidx; z++);
+ return z;
+}
+
+/**
+ * for_each_zone_zonelist - helper macro to iterate over valid zones in a zonelist at or below a given zone index
+ * @zone - The current zone in the iterator
+ * @z - The current pointer within zonelist->zones being iterated
+ * @zlist - The zonelist being iterated
+ * @highidx - The zone index of the highest zone to return
+ *
+ * This iterator iterates though all zones at or below a given zone index.
+ */
+#define for_each_zone_zonelist(zone, z, zlist, highidx) \
+ for (z = first_zones_zonelist(zlist, highidx), zone = *z; \
+ zone; \
+ z = next_zones_zonelist(z, highidx), zone = *z)
+
#ifdef CONFIG_SPARSEMEM
#include <asm/sparsemem.h>
#endif
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/mempolicy.c linux-2.6.23-rc1-mm2-010_use_zonelist/mm/mempolicy.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/mempolicy.c 2007-08-07 14:45:11.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/mm/mempolicy.c 2007-08-08 11:35:09.000000000 +0100
@@ -1120,7 +1120,7 @@ static struct zonelist *zonelist_policy(
nd = 0;
BUG();
}
- return NODE_DATA(nd)->node_zonelists + gfp_zone(gfp);
+ return &NODE_DATA(nd)->node_zonelist;
}

/* Do dynamic interleaving for a process */
@@ -1216,7 +1216,7 @@ struct zonelist *huge_zonelist(struct vm
unsigned nid;

nid = interleave_nid(pol, vma, addr, HPAGE_SHIFT);
- return NODE_DATA(nid)->node_zonelists + gfp_zone(gfp_flags);
+ return &NODE_DATA(nid)->node_zonelist;
}
return zonelist_policy(GFP_HIGHUSER, pol);
}
@@ -1230,7 +1230,7 @@ static struct page *alloc_page_interleav
struct zonelist *zl;
struct page *page;

- zl = NODE_DATA(nid)->node_zonelists + gfp_zone(gfp);
+ zl = &NODE_DATA(nid)->node_zonelist;
page = __alloc_pages(gfp, order, zl);
if (page && page_zone(page) == zl->zones[0])
inc_zone_page_state(page, NUMA_INTERLEAVE_HIT);
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/oom_kill.c linux-2.6.23-rc1-mm2-010_use_zonelist/mm/oom_kill.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/oom_kill.c 2007-08-07 14:45:11.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/mm/oom_kill.c 2007-08-08 11:35:09.000000000 +0100
@@ -177,8 +177,10 @@ static inline int constrained_alloc(stru
{
#ifdef CONFIG_NUMA
struct zone **z;
+ struct zone *zone;
nodemask_t nodes;
int node;
+ enum zone_type high_zoneidx = gfp_zone(gfp_mask);

nodes_clear(nodes);
/* node has memory ? */
@@ -186,9 +188,9 @@ static inline int constrained_alloc(stru
if (NODE_DATA(node)->node_present_pages)
node_set(node, nodes);

- for (z = zonelist->zones; *z; z++)
- if (cpuset_zone_allowed_softwall(*z, gfp_mask))
- node_clear(zone_to_nid(*z), nodes);
+ for_each_zone_zonelist(zone, z, zonelist, high_zoneidx)
+ if (cpuset_zone_allowed_softwall(zone, gfp_mask))
+ node_clear(zone_to_nid(zone), nodes);
else
return CONSTRAINT_CPUSET;

diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/page_alloc.c linux-2.6.23-rc1-mm2-010_use_zonelist/mm/page_alloc.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/page_alloc.c 2007-08-08 11:35:00.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/mm/page_alloc.c 2007-08-08 14:36:42.000000000 +0100
@@ -1416,6 +1416,7 @@ get_page_from_freelist(gfp_t gfp_mask, u
struct page *page = NULL;
int classzone_idx = zone_idx(zonelist->zones[0]);
struct zone *zone;
+ enum zone_type high_zoneidx = gfp_zone(gfp_mask);
nodemask_t *allowednodes = NULL;/* zonelist_cache approximation */
int zlc_active = 0; /* set if using zonelist_cache */
int did_zlc_setup = 0; /* just call zlc_setup() one time */
@@ -1425,13 +1426,10 @@ zonelist_scan:
* Scan zonelist, looking for a zone with enough free.
* See also cpuset_zone_allowed() comment in kernel/cpuset.c.
*/
- z = zonelist->zones;
-
- do {
+ for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
if (NUMA_BUILD && zlc_active &&
!zlc_zone_worth_trying(zonelist, z, allowednodes))
continue;
- zone = *z;
if (unlikely(NUMA_BUILD && (gfp_mask & __GFP_THISNODE) &&
zone->zone_pgdat != zonelist->zones[0]->zone_pgdat))
break;
@@ -1468,7 +1466,7 @@ try_next_zone:
zlc_active = 1;
did_zlc_setup = 1;
}
- } while (*(++z) != NULL);
+ }

if (unlikely(NUMA_BUILD && page == NULL && zlc_active)) {
/* Disable zlc cache for second zonelist scan */
@@ -1781,15 +1779,16 @@ EXPORT_SYMBOL(free_pages);

static unsigned int nr_free_zone_pages(int offset)
{
+ enum zone_type high_zoneidx = MAX_NR_ZONES - 1;
+ struct zone **z;
+ struct zone *zone;
+
/* Just pick one node, since fallback list is circular */
pg_data_t *pgdat = NODE_DATA(numa_node_id());
unsigned int sum = 0;
+ struct zonelist *zonelist = &pgdat->node_zonelist;

- struct zonelist *zonelist = pgdat->node_zonelists + offset;
- struct zone **zonep = zonelist->zones;
- struct zone *zone;
-
- for (zone = *zonep++; zone; zone = *zonep++) {
+ for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) {
unsigned long size = zone->present_pages;
unsigned long high = zone->pages_high;
if (size > high)
@@ -2148,17 +2147,14 @@ static int find_next_best_node(int node,
*/
static void build_zonelists_in_node_order(pg_data_t *pgdat, int node)
{
- enum zone_type i;
int j;
struct zonelist *zonelist;

- for (i = 0; i < MAX_NR_ZONES; i++) {
- zonelist = pgdat->node_zonelists + i;
- for (j = 0; zonelist->zones[j] != NULL; j++)
- ;
- j = build_zonelists_node(NODE_DATA(node), zonelist, j, i);
- zonelist->zones[j] = NULL;
- }
+ zonelist = &pgdat->node_zonelist;
+ for (j = 0; zonelist->zones[j] != NULL; j++)
+ ;
+ j = build_zonelists_node(NODE_DATA(node), zonelist, j, MAX_NR_ZONES-1);
+ zonelist->zones[j] = NULL;
}

/*
@@ -2171,27 +2167,24 @@ static int node_order[MAX_NUMNODES];

static void build_zonelists_in_zone_order(pg_data_t *pgdat, int nr_nodes)
{
- enum zone_type i;
int pos, j, node;
int zone_type; /* needs to be signed */
struct zone *z;
struct zonelist *zonelist;

- for (i = 0; i < MAX_NR_ZONES; i++) {
- zonelist = pgdat->node_zonelists + i;
- pos = 0;
- for (zone_type = i; zone_type >= 0; zone_type--) {
- for (j = 0; j < nr_nodes; j++) {
- node = node_order[j];
- z = &NODE_DATA(node)->node_zones[zone_type];
- if (populated_zone(z)) {
- zonelist->zones[pos++] = z;
- check_highest_zone(zone_type);
- }
+ zonelist = &pgdat->node_zonelist;
+ pos = 0;
+ for (zone_type = MAX_NR_ZONES-1; zone_type >= 0; zone_type--) {
+ for (j = 0; j < nr_nodes; j++) {
+ node = node_order[j];
+ z = &NODE_DATA(node)->node_zones[zone_type];
+ if (populated_zone(z)) {
+ zonelist->zones[pos++] = z;
+ check_highest_zone(zone_type);
}
}
- zonelist->zones[pos] = NULL;
}
+ zonelist->zones[pos] = NULL;
}

static int default_zonelist_order(void)
@@ -2258,17 +2251,14 @@ static void set_zonelist_order(void)
static void build_zonelists(pg_data_t *pgdat)
{
int j, node, load;
- enum zone_type i;
nodemask_t used_mask;
int local_node, prev_node;
struct zonelist *zonelist;
int order = current_zonelist_order;

- /* initialize zonelists */
- for (i = 0; i < MAX_NR_ZONES; i++) {
- zonelist = pgdat->node_zonelists + i;
- zonelist->zones[0] = NULL;
- }
+ /* initialize zonelist */
+ zonelist = &pgdat->node_zonelist;
+ zonelist->zones[0] = NULL;

/* NUMA-aware ordering of nodes */
local_node = pgdat->node_id;
@@ -2316,18 +2306,15 @@ static void build_zonelists(pg_data_t *p
static void build_zonelist_cache(pg_data_t *pgdat)
{
int i;
+ struct zonelist *zonelist;
+ struct zonelist_cache *zlc;
+ struct zone **z;

- for (i = 0; i < MAX_NR_ZONES; i++) {
- struct zonelist *zonelist;
- struct zonelist_cache *zlc;
- struct zone **z;
-
- zonelist = pgdat->node_zonelists + i;
- zonelist->zlcache_ptr = zlc = &zonelist->zlcache;
- bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST);
- for (z = zonelist->zones; *z; z++)
- zlc->z_to_n[z - zonelist->zones] = zone_to_nid(*z);
- }
+ zonelist = &pgdat->node_zonelist;
+ zonelist->zlcache_ptr = zlc = &zonelist->zlcache;
+ bitmap_zero(zlc->fullzones, MAX_ZONES_PER_ZONELIST);
+ for (z = zonelist->zones; *z; z++)
+ zlc->z_to_n[z - zonelist->zones] = zone_to_nid(*z);
}


@@ -2341,45 +2328,42 @@ static void set_zonelist_order(void)
static void build_zonelists(pg_data_t *pgdat)
{
int node, local_node;
- enum zone_type i,j;
+ enum zone_type j;
+ struct zonelist *zonelist;

local_node = pgdat->node_id;
- for (i = 0; i < MAX_NR_ZONES; i++) {
- struct zonelist *zonelist;
-
- zonelist = pgdat->node_zonelists + i;

- j = build_zonelists_node(pgdat, zonelist, 0, i);
- /*
- * Now we build the zonelist so that it contains the zones
- * of all the other nodes.
- * We don't want to pressure a particular node, so when
- * building the zones for node N, we make sure that the
- * zones coming right after the local ones are those from
- * node N+1 (modulo N)
- */
- for (node = local_node + 1; node < MAX_NUMNODES; node++) {
- if (!node_online(node))
- continue;
- j = build_zonelists_node(NODE_DATA(node), zonelist, j, i);
- }
- for (node = 0; node < local_node; node++) {
- if (!node_online(node))
- continue;
- j = build_zonelists_node(NODE_DATA(node), zonelist, j, i);
- }
+ zonelist = &pgdat->node_zonelist;
+ j = build_zonelists_node(pgdat, zonelist, 0, MAX_NR_ZONES-1);

- zonelist->zones[j] = NULL;
+ /*
+ * Now we build the zonelist so that it contains the zones
+ * of all the other nodes.
+ * We don't want to pressure a particular node, so when
+ * building the zones for node N, we make sure that the
+ * zones coming right after the local ones are those from
+ * node N+1 (modulo N)
+ */
+ for (node = local_node + 1; node < MAX_NUMNODES; node++) {
+ if (!node_online(node))
+ continue;
+ j = build_zonelists_node(NODE_DATA(node), zonelist, j,
+ MAX_NR_ZONES-1);
+ }
+ for (node = 0; node < local_node; node++) {
+ if (!node_online(node))
+ continue;
+ j = build_zonelists_node(NODE_DATA(node), zonelist, j,
+ MAX_NR_ZONES-1);
}
+
+ zonelist->zones[j] = NULL;
}

/* non-NUMA variant of zonelist performance cache - just NULL zlcache_ptr */
static void build_zonelist_cache(pg_data_t *pgdat)
{
- int i;
-
- for (i = 0; i < MAX_NR_ZONES; i++)
- pgdat->node_zonelists[i].zlcache_ptr = NULL;
+ pgdat->node_zonelist.zlcache_ptr = NULL;
}

#endif /* CONFIG_NUMA */
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/slab.c linux-2.6.23-rc1-mm2-010_use_zonelist/mm/slab.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/slab.c 2007-08-07 14:45:11.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/mm/slab.c 2007-08-08 11:35:09.000000000 +0100
@@ -3239,14 +3239,15 @@ static void *fallback_alloc(struct kmem_
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;

if (flags & __GFP_THISNODE)
return NULL;

- zonelist = &NODE_DATA(slab_node(current->mempolicy))
- ->node_zonelists[gfp_zone(flags)];
+ zonelist = &NODE_DATA(slab_node(current->mempolicy))->node_zonelist;
local_flags = (flags & GFP_LEVEL_MASK);

retry:
@@ -3254,10 +3255,10 @@ 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,
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/slub.c linux-2.6.23-rc1-mm2-010_use_zonelist/mm/slub.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/slub.c 2007-08-07 14:45:11.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/mm/slub.c 2007-08-08 11:35:09.000000000 +0100
@@ -1285,6 +1285,8 @@ static struct page *get_any_partial(stru
#ifdef CONFIG_NUMA
struct zonelist *zonelist;
struct zone **z;
+ struct zone *zone;
+ enum zone_type high_zoneidx = gfp_zone(flags);
struct page *page;

/*
@@ -1308,14 +1310,13 @@ static struct page *get_any_partial(stru
if (!s->defrag_ratio || get_cycles() % 1024 > s->defrag_ratio)
return NULL;

- zonelist = &NODE_DATA(slab_node(current->mempolicy))
- ->node_zonelists[gfp_zone(flags)];
- for (z = zonelist->zones; *z; z++) {
+ zonelist = &NODE_DATA(slab_node(current->mempolicy))->node_zonelist;
+ 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)
diff -rup -X /usr/src/patchset-0.6/bin//dontdiff linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/vmscan.c linux-2.6.23-rc1-mm2-010_use_zonelist/mm/vmscan.c
--- linux-2.6.23-rc1-mm2-005_freepages_zonelist/mm/vmscan.c 2007-08-08 11:35:00.000000000 +0100
+++ linux-2.6.23-rc1-mm2-010_use_zonelist/mm/vmscan.c 2007-08-08 11:35:09.000000000 +0100
@@ -1136,8 +1136,10 @@ unsigned long try_to_free_pages(struct z
unsigned long nr_reclaimed = 0;
struct reclaim_state *reclaim_state = current->reclaim_state;
unsigned long lru_pages = 0;
- struct zone **zones = zonelist->zones;
+ struct zone **z;
+ struct zone *zone;
int i;
+ enum zone_type high_zoneidx = gfp_zone(gfp_mask);
struct scan_control sc = {
.gfp_mask = gfp_mask,
.may_writepage = !laptop_mode,
@@ -1150,9 +1152,7 @@ unsigned long try_to_free_pages(struct z
delay_swap_prefetch();
count_vm_event(ALLOCSTALL);

- 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;

@@ -1164,7 +1164,7 @@ unsigned long try_to_free_pages(struct z
sc.nr_scanned = 0;
if (!priority)
disable_swap_token();
- nr_reclaimed += shrink_zones(priority, zones, &sc);
+ nr_reclaimed += shrink_zones(priority, zonelist->zones, &sc);
shrink_slab(sc.nr_scanned, gfp_mask, lru_pages);
if (reclaim_state) {
nr_reclaimed += reclaim_state->reclaimed_slab;
@@ -1206,8 +1206,8 @@ out:
*/
if (priority < 0)
priority = 0;
- for (i = 0; zones[i] != 0; i++) {
- struct zone *zone = zones[i];
+ for (i = 0; zonelist->zones[i] != 0; i++) {
+ struct zone *zone = zonelist->zones[i];

if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL))
continue;
-
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