From 957f822a0ab95e88b146638bad6209bbc315bedd Mon Sep 17 00:00:00 2001 From: David Rientjes Date: Mon, 8 Oct 2012 16:33:24 -0700 Subject: mm, numa: reclaim from all nodes within reclaim distance RECLAIM_DISTANCE represents the distance between nodes at which it is deemed too costly to allocate from; it's preferred to try to reclaim from a local zone before falling back to allocating on a remote node with such a distance. To do this, zone_reclaim_mode is set if the distance between any two nodes on the system is greather than this distance. This, however, ends up causing the page allocator to reclaim from every zone regardless of its affinity. What we really want is to reclaim only from zones that are closer than RECLAIM_DISTANCE. This patch adds a nodemask to each node that represents the set of nodes that are within this distance. During the zone iteration, if the bit for a zone's node is set for the local node, then reclaim is attempted; otherwise, the zone is skipped. [akpm@linux-foundation.org: fix CONFIG_NUMA=n build] Signed-off-by: David Rientjes Cc: Mel Gorman Cc: Minchan Kim Cc: KAMEZAWA Hiroyuki Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/mmzone.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux/mmzone.h') diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h index d240efa8f846..a5578871d033 100644 --- a/include/linux/mmzone.h +++ b/include/linux/mmzone.h @@ -709,6 +709,7 @@ 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() */ -- cgit v1.2.3