Hello, Upon ack, please pull from the following git tree. git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git tj-percpu This patchset teaches lpage about NUMA. Till now, lpage allocator did things per-cpu. It allocated one large page per cpu and then gave back whatever is unused which makes chunk size huge which is very inefficient VM space-wise, makes reclamation not work very well and adds to TLB pressure when walking other processor's percpu variables. This patchset first makes the percpu allocator to be able to use non-linear and/or sparse cpu -> unit mapping and then make lpage allocator consider CPU topology and group CPUs in LOCAL_DISTANCE into the same large pages. For example, on an 4/4 NUMA machine, the original code used up 16MB for each chunk but the new code uses only 4MB - one large page for each NUMA node. The grouping code is quite robust and will try to minimize space wastage even when the CPU topology is assymmetric. This patchset will also allow future changes to do partial allocations for cases where there are possible but offline cpus. This patchset contains the following four patchets. 0001-percpu-reorder-a-few-functions-in-mm-percpu.c.patch 0002-percpu-drop-pcpu_chunk-page.patch 0003-percpu-allow-non-linear-sparse-cpu-unit-mappin.patch 0004-percpu-teach-large-page-allocator-about-NUMA.patch 0001 preps for later changes. 0002 drops pcpu_chunk->page which is no longer necessary and would bloat already large pcpu_chunk size when the cpu -> unit mapping becomes sparse. 0003 updates percpu core such that non-linear/sparse cpu->unit mappings are allowed. 0004 teaches lpage allocator about NUMA. This patchset is on top of linus-2.6#master (300df7dc89cc276377fc020704e34875d5c473b6) + [1] tj-percpu-convert-most-archs, take#3 + [2] x86-percpu-fix-pageattr, take#4 + [3] x86-percpu-generalize-4k-and-lpage-allocator and contains the following changes. arch/x86/kernel/setup_percpu.c | 72 ++ include/linux/percpu.h | 30 - mm/percpu.c | 1079 ++++++++++++++++++++++++++++------------- 3 files changed, 834 insertions(+), 347 deletions(-) Thanks. -- tejun [1] http://thread.gmane.org/gmane.linux.kernel.cross-arch/3818 [2] http://thread.gmane.org/gmane.linux.kernel.cross-arch/3825 [3] http://lkml.org/lkml/2009/6/17/2 -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
