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authorFenghua Yu <fenghua.yu@intel.com>2007-07-19 04:48:12 -0400
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-07-19 13:04:44 -0400
commit5fb7dc37dc16fbc8b80d81318a582201ef7e280d (patch)
tree4d6bb4441ece64380e7186ebadd35ad2f5486f9f /include/asm-ia64
parent3d7e33825d8799115dd2495c9944badd3272a623 (diff)
define new percpu interface for shared data
per cpu data section contains two types of data. One set which is exclusively accessed by the local cpu and the other set which is per cpu, but also shared by remote cpus. In the current kernel, these two sets are not clearely separated out. This can potentially cause the same data cacheline shared between the two sets of data, which will result in unnecessary bouncing of the cacheline between cpus. One way to fix the problem is to cacheline align the remotely accessed per cpu data, both at the beginning and at the end. Because of the padding at both ends, this will likely cause some memory wastage and also the interface to achieve this is not clean. This patch: Moves the remotely accessed per cpu data (which is currently marked as ____cacheline_aligned_in_smp) into a different section, where all the data elements are cacheline aligned. And as such, this differentiates the local only data and remotely accessed data cleanly. Signed-off-by: Fenghua Yu <fenghua.yu@intel.com> Acked-by: Suresh Siddha <suresh.b.siddha@intel.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Christoph Lameter <clameter@sgi.com> Cc: <linux-arch@vger.kernel.org> Cc: "Luck, Tony" <tony.luck@intel.com> Cc: Andi Kleen <ak@suse.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/asm-ia64')
-rw-r--r--include/asm-ia64/percpu.h10
1 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-ia64/percpu.h b/include/asm-ia64/percpu.h
index fbe5cf3ab8dc..43a7aac414e0 100644
--- a/include/asm-ia64/percpu.h
+++ b/include/asm-ia64/percpu.h
@@ -29,6 +29,16 @@
29 __attribute__((__section__(".data.percpu"))) \ 29 __attribute__((__section__(".data.percpu"))) \
30 __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name 30 __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name
31 31
32#ifdef CONFIG_SMP
33#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
34 __attribute__((__section__(".data.percpu.shared_aligned"))) \
35 __SMALL_ADDR_AREA __typeof__(type) per_cpu__##name \
36 ____cacheline_aligned_in_smp
37#else
38#define DEFINE_PER_CPU_SHARED_ALIGNED(type, name) \
39 DEFINE_PER_CPU(type, name)
40#endif
41
32/* 42/*
33 * Pretty much a literal copy of asm-generic/percpu.h, except that percpu_modcopy() is an 43 * Pretty much a literal copy of asm-generic/percpu.h, except that percpu_modcopy() is an
34 * external routine, to avoid include-hell. 44 * external routine, to avoid include-hell.