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| author | Anton Blanchard <anton@samba.org> | 2015-10-29 01:44:08 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2015-12-02 09:34:26 +0100 |
| commit | c208505900b232ecdc81dee54cb3a032e75d88d6 (patch) | |
| tree | e63fe696c5a8404bc4257204502f0d6f9ed3ccaf /arch/powerpc/kvm/book3s_hv.c | |
| parent | powerpc: Remove fp_enable() and vec_enable(), use msr_check_and_{set, clear}() (diff) | |
| download | linux-c208505900b232ecdc81dee54cb3a032e75d88d6.tar.xz linux-c208505900b232ecdc81dee54cb3a032e75d88d6.zip | |
powerpc: create giveup_all()
Create a single function that gives everything up (FP, VMX, VSX, SPE).
Doing this all at once means we only do one MSR write.
A context switch microbenchmark using yield():
http://ozlabs.org/~anton/junkcode/context_switch2.c
./context_switch2 --test=yield --fp --altivec --vector 0 0
shows an improvement of 3% on POWER8.
Signed-off-by: Anton Blanchard <anton@samba.org>
[mpe: giveup_all() needs to be EXPORT_SYMBOL'ed]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/kvm/book3s_hv.c')
0 files changed, 0 insertions, 0 deletions