diff options
| author | Mel Gorman <mel@csn.ul.ie> | 2008-04-28 02:12:17 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:18 -0700 |
| commit | dd1a239f6f2d4d3eedd318583ec319aa145b324c (patch) | |
| tree | aff4224c96b5e2e67588c3946858a724863eeaf9 /fs/buffer.c | |
| parent | 54a6eb5c4765aa573a030ceeba2c14e3d2ea5706 (diff) | |
mm: have zonelist contains structs with both a zone pointer and zone_idx
Filtering zonelists requires very frequent use of zone_idx(). This is costly
as it involves a lookup of another structure and a substraction operation. As
the zone_idx is often required, it should be quickly accessible. The node idx
could also be stored here if it was found that accessing zone->node is
significant which may be the case on workloads where nodemasks are heavily
used.
This patch introduces a struct zoneref to store a zone pointer and a zone
index. The zonelist then consists of an array of these struct zonerefs which
are looked up as necessary. Helpers are given for accessing the zone index as
well as the node index.
[kamezawa.hiroyu@jp.fujitsu.com: Suggested struct zoneref instead of embedding information in pointers]
[hugh@veritas.com: mm-have-zonelist: fix memcg ooms]
[hugh@veritas.com: just return do_try_to_free_pages]
[hugh@veritas.com: do_try_to_free_pages gfp_mask redundant]
Signed-off-by: Mel Gorman <mel@csn.ul.ie>
Acked-by: Christoph Lameter <clameter@sgi.com>
Acked-by: David Rientjes <rientjes@google.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: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/buffer.c')
| -rw-r--r-- | fs/buffer.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 9b5434a8047..ac84cd13075 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -360,16 +360,16 @@ void invalidate_bdev(struct block_device *bdev) */ static void free_more_memory(void) { - struct zone **zones; + struct zoneref *zrefs; int nid; wakeup_pdflush(1024); yield(); for_each_online_node(nid) { - zones = first_zones_zonelist(node_zonelist(nid, GFP_NOFS), + zrefs = first_zones_zonelist(node_zonelist(nid, GFP_NOFS), gfp_zone(GFP_NOFS)); - if (*zones) + if (zrefs->zone) try_to_free_pages(node_zonelist(nid, GFP_NOFS), 0, GFP_NOFS); } |