On Thu, 2015-29-10 at 00:43:53 UTC, Anton Blanchard wrote:

Writing the MSR is slow, so we want to avoid it whenever possible.

A subsequent patch will add a debug option that strictly manages the
FP/VMX/VSX unavailable bits. For now just remove it, matching what
we do in other areas of the kernel (eg enable_kernel_altivec()).

A context switch microbenchmark using yield():

http://ozlabs.org/~anton/junkcode/context_switch2.c

./context_switch2 --test=yield --fp 0 0

shows an improvement of almost 3% on POWER8.

Signed-off-by: Anton Blanchard <redacted>

Applied all 19 patches to powerpc next, thanks.

http://git.kernel.org/cgit/linux/kernel/git/powerpc/linux.git/log/?h=next

cheers