On Mon, Mar 21, 2016 at 9:16 AM, Andi Kleen <[email protected]> wrote: > From: Andi Kleen <[email protected]> > > Introduction: > > IvyBridge added four new instructions to directly write the fs and gs > 64bit base registers. Previously this had to be done with a system > call to write to MSRs. The main use case is fast user space threading > and switching the fs/gs registers quickly there. Another use > case is having (relatively) cheap access to a new address > register per thread.
I'm queuing up a variant of this patch. I'll send it out for review when it's ready. --Andy
