[Qemu-ppc] [RFC PATCH 12/17] PowerPC: booke64: Add DO_KVM kernel hooks
Benjamin Herrenschmidt
benh at kernel.crashing.org
Thu Jul 12 08:43:04 EST 2012
On Thu, 2012-07-12 at 00:35 +0200, Alexander Graf wrote:
> > On Thu, 2012-07-12 at 00:25 +0200, Alexander Graf wrote:
> >> Or just free up another register early on, like here.
> >
> > If you're going to do that, you want to measure the impact on null
> > syscall performance though.
>
> That should hold true for any change in that code, no?
Yes, but adding a gpr save is more invasive (you have to also load it
back later on & put it on the stack).
Cheers,
Ben.
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