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| author | Anton Blanchard <anton@samba.org> | 2016-10-03 17:40:29 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-10-04 16:12:16 +1100 |
| commit | bb85fb5803270c52863b983596c2a038facaf4b3 (patch) | |
| tree | 2995f9570fe4d5a9dbbc50a4f53827ea8252ce8b /arch/powerpc/configs/mpc86xx_basic_defconfig | |
| parent | 91ac730b8b1d7c5e71e7ed2d785a61c27433e13d (diff) | |
| download | linux-bb85fb5803270c52863b983596c2a038facaf4b3.tar.bz2 | |
powerpc: During context switch, check before setting mm_cpumask
During context switch, switch_mm() sets our current CPU in mm_cpumask.
We can avoid this atomic sequence in most cases by checking before
setting the bit.
Testing on a POWER8 using our context switch microbenchmark:
tools/testing/selftests/powerpc/benchmarks/context_switch \
--process --no-fp --no-altivec --no-vector
Performance improves 2%.
Signed-off-by: Anton Blanchard <anton@samba.org>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/configs/mpc86xx_basic_defconfig')
0 files changed, 0 insertions, 0 deletions