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| author | Lee Schermerhorn <lee.schermerhorn@hp.com> | 2010-05-26 14:45:00 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-05-27 09:12:57 -0700 |
| commit | 7aac789885512388a66d47280d7e7777ffba1e59 (patch) | |
| tree | af4ac98260268889a422dd264102d2f15d5c1983 /include/asm-generic/topology.h | |
| parent | 3bccd996276b108c138e8176793a26ecef54d573 (diff) | |
| download | linux-7aac789885512388a66d47280d7e7777ffba1e59.tar.gz linux-7aac789885512388a66d47280d7e7777ffba1e59.tar.bz2 linux-7aac789885512388a66d47280d7e7777ffba1e59.zip | |
numa: introduce numa_mem_id()- effective local memory node id
Introduce numa_mem_id(), based on generic percpu variable infrastructure
to track "nearest node with memory" for archs that support memoryless
nodes.
Define API in <linux/topology.h> when CONFIG_HAVE_MEMORYLESS_NODES
defined, else stubs. Architectures will define HAVE_MEMORYLESS_NODES
if/when they support them.
Archs can override definitions of:
numa_mem_id() - returns node number of "local memory" node
set_numa_mem() - initialize [this cpus'] per cpu variable 'numa_mem'
cpu_to_mem() - return numa_mem for specified cpu; may be used as lvalue
Generic initialization of 'numa_mem' occurs in __build_all_zonelists().
This will initialize the boot cpu at boot time, and all cpus on change of
numa_zonelist_order, or when node or memory hot-plug requires zonelist
rebuild. Archs that support memoryless nodes will need to initialize
'numa_mem' for secondary cpus as they're brought on-line.
[akpm@linux-foundation.org: fix build]
Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com>
Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Cc: Tejun Heo <tj@kernel.org>
Cc: Mel Gorman <mel@csn.ul.ie>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Nick Piggin <npiggin@suse.de>
Cc: David Rientjes <rientjes@google.com>
Cc: Eric Whitney <eric.whitney@hp.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: "Luck, Tony" <tony.luck@intel.com>
Cc: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: <linux-arch@vger.kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-generic/topology.h')
| -rw-r--r-- | include/asm-generic/topology.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/asm-generic/topology.h b/include/asm-generic/topology.h index 510df36dd5d4..fd60700503c8 100644 --- a/include/asm-generic/topology.h +++ b/include/asm-generic/topology.h @@ -34,6 +34,9 @@ #ifndef cpu_to_node #define cpu_to_node(cpu) ((void)(cpu),0) #endif +#ifndef cpu_to_mem +#define cpu_to_mem(cpu) ((void)(cpu),0) +#endif #ifndef parent_node #define parent_node(node) ((void)(node),0) #endif |