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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 11:30:20 +0000 |
| commit | c32ffce0f66e5d1d4856254516e24f5ef275cd00 (patch) | |
| tree | 125229cdd38bfd6e7e62cff7eb8771a34cc999a7 /mm/page_io.c | |
| parent | 6ea41c80115f49e7d8b80312ffc99973d283471f (diff) | |
| download | talos-obmc-linux-c32ffce0f66e5d1d4856254516e24f5ef275cd00.tar.gz talos-obmc-linux-c32ffce0f66e5d1d4856254516e24f5ef275cd00.zip | |
ARM: 7984/1: prefetch: add prefetchw invocations for barriered atomics
After a bunch of benchmarking on the interaction between dmb and pldw,
it turns out that issuing the pldw *after* the dmb instruction can
give modest performance gains (~3% atomic_add_return improvement on a
dual A15).
This patch adds prefetchw invocations to our barriered atomic operations
including cmpxchg, test_and_xxx and futexes.
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'mm/page_io.c')
0 files changed, 0 insertions, 0 deletions
