[RFC PATCH] getcpu_cache system call: caching current CPU number (x86)

[Andy Lutomirski]

On Jul 20, 2015 1:35 AM, "Florian Weimer" <fweimer@redhat.com> wrote:
>
> On 07/18/2015 01:33 AM, Andy Lutomirski wrote:
>
> > I think the API should be "set gsbase to x + y*(cpu number)".  On
> > x86_64, userspace just allocates a big swath of virtual space and
> > populates it as needed.
>
> This will break WINE and similar applications which use %gs today.

Presumably WINE could just opt not to use this facility, just like
WINE will have to opt out of whatever the enterprise people who want
WRGSBASE were thinking of doing with it.

--Andy