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authorMel Gorman <mel@csn.ul.ie>2009-06-16 15:32:09 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:34 -0700
commitd395b73428d9748fb70b33477c9b2acae62f360a (patch)
tree942bcfe36894ca8e13e6773c4713442a58a44a6d
parentda456f14d2f2d7350f2b9440af79c85a34c7eed5 (diff)
downloadop-kernel-dev-d395b73428d9748fb70b33477c9b2acae62f360a.zip
op-kernel-dev-d395b73428d9748fb70b33477c9b2acae62f360a.tar.gz
page allocator: do not setup zonelist cache when there is only one node
There is a zonelist cache which is used to track zones that are not in the allowed cpuset or found to be recently full. This is to reduce cache footprint on large machines. On smaller machines, it just incurs cost for no gain. This patch only uses the zonelist cache when there are NUMA nodes. Signed-off-by: Mel Gorman <mel@csn.ul.ie> Reviewed-by: Christoph Lameter <cl@linux-foundation.org> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Pekka Enberg <penberg@cs.helsinki.fi> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Dave Hansen <dave@linux.vnet.ibm.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/page_alloc.c7
1 files changed, 5 insertions, 2 deletions
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 03a386d..fd8e3ca 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -1464,8 +1464,11 @@ this_zone_full:
if (NUMA_BUILD)
zlc_mark_zone_full(zonelist, z);
try_next_zone:
- if (NUMA_BUILD && !did_zlc_setup) {
- /* we do zlc_setup after the first zone is tried */
+ if (NUMA_BUILD && !did_zlc_setup && num_online_nodes() > 1) {
+ /*
+ * we do zlc_setup after the first zone is tried but only
+ * if there are multiple nodes make it worthwhile
+ */
allowednodes = zlc_setup(zonelist, alloc_flags);
zlc_active = 1;
did_zlc_setup = 1;
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