On Mon, Nov 23 2020 at 22:15, Thomas Gleixner wrote:
> On Sun, Nov 22 2020 at 15:16, Andy Lutomirski wrote:
>> On Fri, Nov 20, 2020 at 1:29 AM Peter Zijlstra <peterz@xxxxxxxxxxxxx> wrote:
>> The common case of a CPU switching back and forth between a small
>> number of mms would have no significant overhead.
>
> For CPUs which do not support PCID this sucks, which is everything pre
> Westmere and all of 32bit. Yes, 32bit. If we go there then 32bit has to
> bite the bullet and use the very same mechanism. Not that I care much
> TBH.
Bah, I completely forgot that AMD does not support PCID before Zen3
which is a major showstopper.
Thanks,
tglx
