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| author | Will Deacon <will.deacon@arm.com> | 2014-02-21 17:01:48 +0100 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-02-25 11:35:08 +0000 |
| commit | db38ee874c48713d0723221d08332242e0088970 (patch) | |
| tree | 065fee530d0374306564ea37606617f007af6c64 /arch/arm/kernel/bios32.c | |
| parent | d98b90ea22b0a28d9d787769704a9cf1ea5a513a (diff) | |
ARM: 7983/1: atomics: implement a better __atomic_add_unless for v6+
Looking at perf profiles of multi-threaded hackbench runs, a significant
performance hit appears to manifest from the cmpxchg loop used to
implement the 32-bit atomic_add_unless function. This can be mitigated
by writing a direct implementation of __atomic_add_unless which doesn't
require iteration outside of the atomic operation.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch/arm/kernel/bios32.c')
0 files changed, 0 insertions, 0 deletions