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mm: use two zonelist that are filtered by GFP mask

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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 <mel@csn.ul.ie>
Acked-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: 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>
This commit is contained in:
Mel Gorman 2008-04-28 02:12:16 -07:00 • committed by Linus Torvalds
parent 18ea7e710d
commit 54a6eb5c47
10 changed files with 168 additions and 154 deletions
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10
fs/buffer.c
View file

@ -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);
}
}