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| author | Robert Richter <robert.richter@amd.com> | 2009-04-29 12:47:02 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-04-29 14:51:02 +0200 |
| commit | 527e26af3741a2168986d8b82653ffe173891324 (patch) | |
| tree | 07ef21f4a87badb3252ee9631d6809c7ff597aea /README | |
| parent | 4295ee62660b13ddb87d41539f49b239e6e7d56f (diff) | |
perf_counter, x86: protect per-cpu variables with compile barriers only
Per-cpu variables needn't to be protected with cpu barriers
(smp_wmb()). Protection is only needed for preemption on the same cpu
(rescheduling or the nmi handler). This can be done using a compiler
barrier only.
[ Impact: micro-optimization ]
Signed-off-by: Robert Richter <robert.richter@amd.com>
Cc: Paul Mackerras <paulus@samba.org>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <1241002046-8832-6-git-send-email-robert.richter@amd.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'README')
0 files changed, 0 insertions, 0 deletions