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authorLee Schermerhorn <lee.schermerhorn@hp.com>2010-05-26 17:45:03 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2010-05-27 12:12:57 -0400
commit7d6e6d09de82cf6cff7fecdba55198b9f47b381c (patch)
tree57b26da3bea0af63dd0b65cdcdde33fe5670a35f /mm/percpu-vm.c
parentfd1197f1131a1f1d8bc192f9cfbbe17e305f17f3 (diff)
numa: slab: use numa_mem_id() for slab local memory node
Example usage of generic "numa_mem_id()": The mainline slab code, since ~ 2.6.19, does not handle memoryless nodes well. Specifically, the "fast path"--____cache_alloc()--will never succeed as slab doesn't cache offnode object on the per cpu queues, and for memoryless nodes, all memory will be "off node" relative to numa_node_id(). This adds significant overhead to all kmem cache allocations, incurring a significant regression relative to earlier kernels [from before slab.c was reorganized]. This patch uses the generic topology function "numa_mem_id()" to return the "effective local memory node" for the calling context. This is the first node in the local node's generic fallback zonelist-- the same node that "local" mempolicy-based allocations would use. This lets slab cache these "local" allocations and avoid fallback/refill on every allocation. N.B.: Slab will need to handle node and memory hotplug events that could change the value returned by numa_mem_id() for any given node if recent changes to address memory hotplug don't already address this. E.g., flush all per cpu slab queues before rebuilding the zonelists while the "machine" is held in the stopped state. Performance impact on "hackbench 400 process 200" 2.6.34-rc3-mmotm-100405-1609 no-patch this-patch ia64 no memoryless nodes [avg of 10]: 11.713 11.637 ~0.65 diff ia64 cpus all on memless nodes [10]: 228.259 26.484 ~8.6x speedup The slowdown of the patched kernel from ~12 sec to ~28 seconds when configured with memoryless nodes is the result of all cpus allocating from a single node's mm pagepool. The cache lines of the single node are distributed/interleaved over the memory of the real physical nodes, but the zone lock, list heads, ... of the single node with memory still each live in a single cache line that is accessed from all processors. x86_64 [8x6 AMD] [avg of 40]: 2.883 2.845 Signed-off-by: Lee Schermerhorn <lee.schermerhorn@hp.com> 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 'mm/percpu-vm.c')
0 files changed, 0 insertions, 0 deletions