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authorChristoph Lameter <cl@linux-foundation.org>2009-06-16 15:32:15 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-06-16 19:47:35 -0700
commit62bc62a873116805774ffd37d7f86aa4faa832b1 (patch)
tree7f3f5b94b2d484a13ca27b8d3f6f54cfe126d7c0 /net
parent974709bdb2a34db378fc84140220f363f558d0d6 (diff)
downloadop-kernel-dev-62bc62a873116805774ffd37d7f86aa4faa832b1.zip
op-kernel-dev-62bc62a873116805774ffd37d7f86aa4faa832b1.tar.gz
page allocator: use a pre-calculated value instead of num_online_nodes() in fast paths
num_online_nodes() is called in a number of places but most often by the page allocator when deciding whether the zonelist needs to be filtered based on cpusets or the zonelist cache. This is actually a heavy function and touches a number of cache lines. This patch stores the number of online nodes at boot time and updates the value when nodes get onlined and offlined. The value is then used in a number of important paths in place of num_online_nodes(). [rientjes@google.com: do not override definition of node_set_online() with macro] Signed-off-by: Christoph Lameter <cl@linux-foundation.org> Signed-off-by: Mel Gorman <mel@csn.ul.ie> 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: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net')
-rw-r--r--net/sunrpc/svc.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/net/sunrpc/svc.c b/net/sunrpc/svc.c
index 8847add..5ed8931 100644
--- a/net/sunrpc/svc.c
+++ b/net/sunrpc/svc.c
@@ -124,7 +124,7 @@ svc_pool_map_choose_mode(void)
{
unsigned int node;
- if (num_online_nodes() > 1) {
+ if (nr_online_nodes > 1) {
/*
* Actually have multiple NUMA nodes,
* so split pools on NUMA node boundaries
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