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authorMel Gorman <mgorman@suse.de>2014-06-04 16:07:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:53:59 -0700
commit5f7a75acdb24c7b9c436b3a0a66eec12e101d19c (patch)
tree09bb84ff22ba1de0b19f403242b78bd2d35e24ce /mm/page_alloc.c
parent4f9b16a64753d0bb607454347036dc997fd03b82 (diff)
downloadlwn-5f7a75acdb24c7b9c436b3a0a66eec12e101d19c.tar.gz
lwn-5f7a75acdb24c7b9c436b3a0a66eec12e101d19c.zip
mm: page_alloc: do not cache reclaim distances
pgdat->reclaim_nodes tracks if a remote node is allowed to be reclaimed by zone_reclaim due to its distance. As it is expected that zone_reclaim_mode will be rarely enabled it is unreasonable for all machines to take a penalty. Fortunately, the zone_reclaim_mode() path is already slow and it is the path that takes the hit. Signed-off-by: Mel Gorman <mgorman@suse.de> Acked-by: Johannes Weiner <hannes@cmpxchg.org> Reviewed-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Acked-by: Michal Hocko <mhocko@suse.cz> Reviewed-by: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/page_alloc.c')
-rw-r--r--mm/page_alloc.c17
1 files changed, 2 insertions, 15 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index dfe954fbb48a..9f13bcfb6762 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1850,16 +1850,8 @@ static bool zone_local(struct zone *local_zone, struct zone *zone)
static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
{
- return node_isset(local_zone->node, zone->zone_pgdat->reclaim_nodes);
-}
-
-static void __paginginit init_zone_allows_reclaim(int nid)
-{
- int i;
-
- for_each_node_state(i, N_MEMORY)
- if (node_distance(nid, i) <= RECLAIM_DISTANCE)
- node_set(i, NODE_DATA(nid)->reclaim_nodes);
+ return node_distance(zone_to_nid(local_zone), zone_to_nid(zone)) <
+ RECLAIM_DISTANCE;
}
#else /* CONFIG_NUMA */
@@ -1893,9 +1885,6 @@ static bool zone_allows_reclaim(struct zone *local_zone, struct zone *zone)
return true;
}
-static inline void init_zone_allows_reclaim(int nid)
-{
-}
#endif /* CONFIG_NUMA */
/*
@@ -4933,8 +4922,6 @@ void __paginginit free_area_init_node(int nid, unsigned long *zones_size,
pgdat->node_id = nid;
pgdat->node_start_pfn = node_start_pfn;
- if (node_state(nid, N_MEMORY))
- init_zone_allows_reclaim(nid);
#ifdef CONFIG_HAVE_MEMBLOCK_NODE_MAP
get_pfn_range_for_nid(nid, &start_pfn, &end_pfn);
#endif