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Lee Schermerhorn
7aac789885
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. [[email protected]: fix build] Signed-off-by: Lee Schermerhorn <[email protected]> Signed-off-by: Christoph Lameter <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Christoph Lameter <[email protected]> Cc: Nick Piggin <[email protected]> Cc: David Rientjes <[email protected]> Cc: Eric Whitney <[email protected]> Cc: KAMEZAWA Hiroyuki <[email protected]> Cc: Ingo Molnar <[email protected]> Cc: Thomas Gleixner <[email protected]> Cc: "H. Peter Anvin" <[email protected]> Cc: "Luck, Tony" <[email protected]> Cc: Pekka Enberg <[email protected]> Cc: <[email protected]> Signed-off-by: Andrew Morton <[email protected]> Signed-off-by: Linus Torvalds <[email protected]>