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| author | Anton Blanchard | 2016-10-03 08:03:03 +0200 |
|---|---|---|
| committer | Michael Ellerman | 2016-10-04 07:13:13 +0200 |
| commit | 61e98ebff3ba3d3b17e999dc483c2680480ed715 (patch) | |
| tree | 3413b146a703edb4e7a5cbf963ce57a639ef791b /arch/powerpc/Kconfig | |
| parent | powerpc: During context switch, check before setting mm_cpumask (diff) | |
| download | kernel-qcow2-linux-61e98ebff3ba3d3b17e999dc483c2680480ed715.tar.gz kernel-qcow2-linux-61e98ebff3ba3d3b17e999dc483c2680480ed715.tar.xz kernel-qcow2-linux-61e98ebff3ba3d3b17e999dc483c2680480ed715.zip | |
powerpc: Remove static branch prediction in atomic{, 64}_add_unless
I see quite a lot of static branch mispredictions on a simple
web serving workload. The issue is in __atomic_add_unless(), called
from _atomic_dec_and_lock(). There is no obvious common case, so it
is better to let the hardware predict the branch.
Signed-off-by: Anton Blanchard <anton@samba.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/Kconfig')
0 files changed, 0 insertions, 0 deletions