From 54a6eb5c4765aa573a030ceeba2c14e3d2ea5706 Mon Sep 17 00:00:00 2001 From: Mel Gorman Date: Mon, 28 Apr 2008 02:12:16 -0700 Subject: mm: use two zonelist that are filtered by GFP mask Currently a node has two sets of zonelists, one for each zone type in the system and a second set for GFP_THISNODE allocations. Based on the zones allowed by a gfp mask, one of these zonelists is selected. All of these zonelists consume memory and occupy cache lines. This patch replaces the multiple zonelists per-node with two zonelists. The first contains all populated zones in the system, ordered by distance, for fallback allocations when the target/preferred node has no free pages. The second contains all populated zones in the node suitable for GFP_THISNODE allocations. An iterator macro is introduced called for_each_zone_zonelist() that interates through each zone allowed by the GFP flags in the selected zonelist. Signed-off-by: Mel Gorman Acked-by: Christoph Lameter Signed-off-by: Lee Schermerhorn Cc: KAMEZAWA Hiroyuki Cc: Mel Gorman Cc: Christoph Lameter Cc: Hugh Dickins Cc: Nick Piggin Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- fs/buffer.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-) (limited to 'fs/buffer.c') diff --git a/fs/buffer.c b/fs/buffer.c index 71358499bc57..9b5434a80479 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -360,16 +360,18 @@ void invalidate_bdev(struct block_device *bdev) */ static void free_more_memory(void) { - struct zonelist *zonelist; + struct zone **zones; int nid; wakeup_pdflush(1024); yield(); for_each_online_node(nid) { - zonelist = node_zonelist(nid, GFP_NOFS); - if (zonelist->zones[0]) - try_to_free_pages(zonelist, 0, GFP_NOFS); + zones = first_zones_zonelist(node_zonelist(nid, GFP_NOFS), + gfp_zone(GFP_NOFS)); + if (*zones) + try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0, + GFP_NOFS); } } -- cgit v1.2.3-59-g8ed1b