x86, numa: Use near(er) online node instead of roundrobin for NUMA
authorYinghai Lu <yinghai@kernel.org>
Sat, 21 Nov 2009 08:23:37 +0000 (00:23 -0800)
committerIngo Molnar <mingo@elte.hu>
Mon, 23 Nov 2009 09:06:24 +0000 (10:06 +0100)
commitd9c2d5ac6af87b4491bff107113aaf16f6c2b2d9
tree5cb605d6396a0572dabf2b6152bb26fea425e376
parent021428ad1418cf3c386a1a0157140c3ea29b17ef
x86, numa: Use near(er) online node instead of roundrobin for NUMA

CPU to node mapping is set via the following sequence:

 1. numa_init_array(): Set up roundrobin from cpu to online node

 2. init_cpu_to_node(): Set that according to apicid_to_node[]
according to srat only handle the node that
is online, and leave other cpu on node
without ram (aka not online) to still
roundrobin.

3. later call srat_detect_node for Intel/AMD, will use first_online
   node or nearby node.

Problem is that setup_per_cpu_areas() is not called between 2 and 3,
the per_cpu for cpu on node with ram is on different node, and could
put that on node with two hops away.

So try to optimize this and add find_near_online_node() and call
init_cpu_to_node().

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: David Rientjes <rientjes@google.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
LKML-Reference: <4B07A739.3030104@kernel.org>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
arch/x86/kernel/cpu/intel.c
arch/x86/mm/numa_64.c