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authorMel Gorman <mel@csn.ul.ie>2008-04-28 02:12:14 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-04-28 08:58:18 -0700
commit18ea7e710d2452fa726814a406779188028cf1bf (patch)
treedfa439770b4344ade1ad8bd4fe70920ad66ee064
parent0e88460da6ab7bb6a7ef83675412ed5b6315d741 (diff)
mm: remember what the preferred zone is for zone_statistics
On NUMA, zone_statistics() is used to record events like numa hit, miss and foreign. It assumes that the first zone in a zonelist is the preferred zone. When multiple zonelists are replaced by one that is filtered, this is no longer the case. This patch records what the preferred zone is rather than assuming the first zone in the zonelist is it. This simplifies the reading of later patches in this set. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Cc: Mel Gorman <mel@csn.ul.ie> Reviewed-by: 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>
-rw-r--r--include/linux/vmstat.h2
-rw-r--r--mm/page_alloc.c9
-rw-r--r--mm/vmstat.c6
3 files changed, 9 insertions, 8 deletions
diff --git a/include/linux/vmstat.h b/include/linux/vmstat.h
index 9f1b4b46151..e726b6d4649 100644
--- a/include/linux/vmstat.h
+++ b/include/linux/vmstat.h
@@ -174,7 +174,7 @@ static inline unsigned long node_page_state(int node,
zone_page_state(&zones[ZONE_MOVABLE], item);
}
-extern void zone_statistics(struct zonelist *, struct zone *);
+extern void zone_statistics(struct zone *, struct zone *);
#else
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 63ff71830ea..187efd47a44 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1050,7 +1050,7 @@ void split_page(struct page *page, unsigned int order)
* we cheat by calling it from here, in the order > 0 path. Saves a branch
* or two.
*/
-static struct page *buffered_rmqueue(struct zonelist *zonelist,
+static struct page *buffered_rmqueue(struct zone *preferred_zone,
struct zone *zone, int order, gfp_t gfp_flags)
{
unsigned long flags;
@@ -1102,7 +1102,7 @@ again:
}
__count_zone_vm_events(PGALLOC, zone, 1 << order);
- zone_statistics(zonelist, zone);
+ zone_statistics(preferred_zone, zone);
local_irq_restore(flags);
put_cpu();
@@ -1383,7 +1383,7 @@ get_page_from_freelist(gfp_t gfp_mask, unsigned int order,
struct zone **z;
struct page *page = NULL;
int classzone_idx = zone_idx(zonelist->zones[0]);
- struct zone *zone;
+ struct zone *zone, *preferred_zone;
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 */
@@ -1395,6 +1395,7 @@ zonelist_scan:
* See also cpuset_zone_allowed() comment in kernel/cpuset.c.
*/
z = zonelist->zones;
+ preferred_zone = *z;
do {
/*
@@ -1433,7 +1434,7 @@ zonelist_scan:
}
}
- page = buffered_rmqueue(zonelist, zone, order, gfp_mask);
+ page = buffered_rmqueue(preferred_zone, zone, order, gfp_mask);
if (page)
break;
this_zone_full:
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 7c7286e9506..879bcc0a1d4 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -364,13 +364,13 @@ void refresh_cpu_vm_stats(int cpu)
*
* Must be called with interrupts disabled.
*/
-void zone_statistics(struct zonelist *zonelist, struct zone *z)
+void zone_statistics(struct zone *preferred_zone, struct zone *z)
{
- if (z->zone_pgdat == zonelist->zones[0]->zone_pgdat) {
+ if (z->zone_pgdat == preferred_zone->zone_pgdat) {
__inc_zone_state(z, NUMA_HIT);
} else {
__inc_zone_state(z, NUMA_MISS);
- __inc_zone_state(zonelist->zones[0], NUMA_FOREIGN);
+ __inc_zone_state(preferred_zone, NUMA_FOREIGN);
}
if (z->node == numa_node_id())
__inc_zone_state(z, NUMA_LOCAL);