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| author | Mel Gorman <mel@csn.ul.ie> | 2008-04-28 02:12:16 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-28 08:58:18 -0700 |
| commit | 54a6eb5c4765aa573a030ceeba2c14e3d2ea5706 (patch) | |
| tree | 547176a090beb787722a153cf2b8b942dc0e68db /mm/vmscan.c | |
| parent | 18ea7e710d2452fa726814a406779188028cf1bf (diff) | |
| download | lwn-54a6eb5c4765aa573a030ceeba2c14e3d2ea5706.tar.gz lwn-54a6eb5c4765aa573a030ceeba2c14e3d2ea5706.zip | |
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 <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>
Diffstat (limited to 'mm/vmscan.c')
| -rw-r--r-- | mm/vmscan.c | 21 |
1 files changed, 9 insertions, 12 deletions
diff --git a/mm/vmscan.c b/mm/vmscan.c index ef8551e0d2d0..0515b8f44894 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -1249,15 +1249,13 @@ static unsigned long shrink_zone(int priority, struct zone *zone, static unsigned long shrink_zones(int priority, struct zonelist *zonelist, struct scan_control *sc) { + enum zone_type high_zoneidx = gfp_zone(sc->gfp_mask); unsigned long nr_reclaimed = 0; - struct zone **zones = zonelist->zones; - int i; - + struct zone **z; + struct zone *zone; sc->all_unreclaimable = 1; - for (i = 0; zones[i] != NULL; i++) { - struct zone *zone = zones[i]; - + for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { if (!populated_zone(zone)) continue; /* @@ -1311,8 +1309,9 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist, unsigned long nr_reclaimed = 0; struct reclaim_state *reclaim_state = current->reclaim_state; unsigned long lru_pages = 0; - struct zone **zones = zonelist->zones; - int i; + struct zone **z; + struct zone *zone; + enum zone_type high_zoneidx = gfp_zone(gfp_mask); if (scan_global_lru(sc)) count_vm_event(ALLOCSTALL); @@ -1320,8 +1319,7 @@ static unsigned long do_try_to_free_pages(struct zonelist *zonelist, * mem_cgroup will not do shrink_slab. */ if (scan_global_lru(sc)) { - for (i = 0; zones[i] != NULL; i++) { - struct zone *zone = zones[i]; + for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL)) continue; @@ -1385,8 +1383,7 @@ out: priority = 0; if (scan_global_lru(sc)) { - for (i = 0; zones[i] != NULL; i++) { - struct zone *zone = zones[i]; + for_each_zone_zonelist(zone, z, zonelist, high_zoneidx) { if (!cpuset_zone_allowed_hardwall(zone, GFP_KERNEL)) continue; |