summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/include
diff options
context:
space:
mode:
authorAnton Blanchard <anton@samba.org>2010-05-16 20:22:31 +0000
committerBenjamin Herrenschmidt <benh@kernel.crashing.org>2010-07-09 11:28:35 +1000
commit41eab6f88f24124df89e38067b3766b7bef06ddb (patch)
tree41ec35970c76adbba1558b6243d80be669062136 /arch/powerpc/include
parenta591f6b56d6fbd7d1951e352fe5b0acf6b91e497 (diff)
powerpc/numa: Use form 1 affinity to setup node distance
Form 1 affinity allows multiple entries in ibm,associativity-reference-points which represent affinity domains in decreasing order of importance. The Linux concept of a node is always the first entry, but using the other values as an input to node_distance() allows the memory allocator to make better decisions on which node to go first when local memory has been exhausted. We keep things simple and create an array indexed by NUMA node, capped at 4 entries. Each time we lookup an associativity property we initialise the array which is overkill, but since we should only hit this path during boot it didn't seem worth adding a per node valid bit. Signed-off-by: Anton Blanchard <anton@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Diffstat (limited to 'arch/powerpc/include')
-rw-r--r--arch/powerpc/include/asm/topology.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/topology.h b/arch/powerpc/include/asm/topology.h
index 32adf728072..3033c1b3074 100644
--- a/arch/powerpc/include/asm/topology.h
+++ b/arch/powerpc/include/asm/topology.h
@@ -87,6 +87,9 @@ static inline int pcibus_to_node(struct pci_bus *bus)
.balance_interval = 1, \
}
+extern int __node_distance(int, int);
+#define node_distance(a, b) __node_distance(a, b)
+
extern void __init dump_numa_cpu_topology(void);
extern int sysfs_add_device_to_node(struct sys_device *dev, int nid);