Subject: + mm-page_alloc-do-not-cache-reclaim-distances.patch added to -mm tree
To: mgorman@xxxxxxx,hannes@xxxxxxxxxxx,mhocko@xxxxxxx,zhangyanfei@xxxxxxxxxxxxxx
From: akpm@xxxxxxxxxxxxxxxxxxxx
Date: Fri, 18 Apr 2014 13:06:38 -0700
The patch titled
Subject: mm: page_alloc: do not cache reclaim distances
has been added to the -mm tree. Its filename is
mm-page_alloc-do-not-cache-reclaim-distances.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-page_alloc-do-not-cache-reclaim-distances.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-page_alloc-do-not-cache-reclaim-distances.patch
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------------------------------------------------------
From: Mel Gorman <mgorman@xxxxxxx>
Subject: 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@xxxxxxx>
Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Reviewed-by: Zhang Yanfei <zhangyanfei@xxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/mmzone.h | 1 -
mm/page_alloc.c | 15 ++-------------
2 files changed, 2 insertions(+), 14 deletions(-)
diff -puN include/linux/mmzone.h~mm-page_alloc-do-not-cache-reclaim-distances include/linux/mmzone.h
--- a/include/linux/mmzone.h~mm-page_alloc-do-not-cache-reclaim-distances
+++ a/include/linux/mmzone.h
@@ -763,7 +763,6 @@ typedef struct pglist_data {
unsigned long node_spanned_pages; /* total size of physical page
range, including holes */
int node_id;
- nodemask_t reclaim_nodes; /* Nodes allowed to reclaim from */
wait_queue_head_t kswapd_wait;
wait_queue_head_t pfmemalloc_wait;
struct task_struct *kswapd; /* Protected by lock_memory_hotplug() */
diff -puN mm/page_alloc.c~mm-page_alloc-do-not-cache-reclaim-distances mm/page_alloc.c
--- a/mm/page_alloc.c~mm-page_alloc-do-not-cache-reclaim-distances
+++ a/mm/page_alloc.c
@@ -1850,16 +1850,8 @@ static bool zone_local(struct zone *loca
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 z
return true;
}
-static inline void init_zone_allows_reclaim(int nid)
-{
-}
#endif /* CONFIG_NUMA */
/*
_
Patches currently in -mm which might be from mgorman@xxxxxxx are
mm-use-paravirt-friendly-ops-for-numa-hinting-ptes.patch
thp-close-race-between-split-and-zap-huge-pages.patch
x86-require-x86-64-for-automatic-numa-balancing.patch
x86-define-_page_numa-by-reusing-software-bits-on-the-pmd-and-pte-levels.patch
x86-define-_page_numa-by-reusing-software-bits-on-the-pmd-and-pte-levels-fix-2.patch
mm-introduce-do_shared_fault-and-drop-do_fault-fix-fix.patch
mm-compactionc-isolate_freepages_block-small-tuneup.patch
mm-only-force-scan-in-reclaim-when-none-of-the-lrus-are-big-enough.patch
mm-huge_memoryc-complete-conversion-to-pr_foo.patch
mm-disable-zone_reclaim_mode-by-default.patch
mm-page_alloc-do-not-cache-reclaim-distances.patch
do_shared_fault-check-that-mmap_sem-is-held.patch
linux-next.patch
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