https://github.com/torvalds/linux
Revision a8ddac7e53e89cb877965097d05adfeb1c91def3 authored by Nick Piggin on 21 October 2008, 08:59:15 UTC, committed by Linus Torvalds on 23 October 2008, 16:18:20 UTC
- atomic operations which both modify the variable and return something imply full smp memory barriers before and after the memory operations involved (failing atomic_cmpxchg, atomic_add_unless, etc don't imply a barrier because they don't modify the target). See Documentation/atomic_ops.txt. So remove extra barriers and branches. - All architectures support atomic_cmpxchg. This has no relation to __HAVE_ARCH_CMPXCHG. We can just take the atomic_cmpxchg path unconditionally This reduces a simple single threaded fastpath lock+unlock test from 590 cycles to 203 cycles on a ppc970 system. Signed-off-by: Nick Piggin <npiggin@suse.de> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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Tip revision: a8ddac7e53e89cb877965097d05adfeb1c91def3 authored by Nick Piggin on 21 October 2008, 08:59:15 UTC
mutex: speed up generic mutex implementations
mutex: speed up generic mutex implementations
Tip revision: a8ddac7
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| kernel | ||
| lib | ||
| mm | ||
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| .gitignore | -rw-r--r-- | 867 bytes |
| .mailmap | -rw-r--r-- | 3.7 KB |
| COPYING | -rw-r--r-- | 18.3 KB |
| CREDITS | -rw-r--r-- | 91.0 KB |
| Kbuild | -rw-r--r-- | 2.4 KB |
| MAINTAINERS | -rw-r--r-- | 101.7 KB |
| Makefile | -rw-r--r-- | 55.4 KB |
| README | -rw-r--r-- | 16.5 KB |
| REPORTING-BUGS | -rw-r--r-- | 3.1 KB |
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