linux-kernel - Re: [PATCH RFC 2/5] x86,fpu: delay FPU register loading until switch to userspace

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Date:   Tue, 04 Oct 2016 08:48:19 -0400
From:   Rik van Riel <riel@...hat.com>
To:     Ingo Molnar <mingo@...nel.org>,
        Andy Lutomirski <luto@...capital.net>
Cc:     Dave Hansen <dave.hansen@...ux.intel.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        X86 ML <x86@...nel.org>, Thomas Gleixner <tglx@...utronix.de>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Ingo Molnar <mingo@...hat.com>,
        Andrew Lutomirski <luto@...nel.org>,
        "H. Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...e.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH RFC 2/5] x86,fpu: delay FPU register loading until
 switch to userspace

On Tue, 2016-10-04 at 08:35 +0200, Ingo Molnar wrote:
> * Andy Lutomirski <luto@...capital.net> wrote:
> 
> > > We can get rid of fpu.counter, since nobody uses it
> > > any more.
> > 
> > We should definitely do this.
> > 
> > Maybe getting in some cleanups first (my lazy fpu deletion,
> > fpu.counter removal, etc) first is the way to go.
> 
> Could you guys please submit all pending FPU bits that aren't new
> functionality to -tip? I'll remove lazy FPU handling if you don't
> beat me to it.
> 
> Plus after lazy FPU removal we should take another good look and
> make the FPU state machine even more obvious and self-documenting.
> 
> Upstream merge commit 597f03f9d133 would be a good base.

I am flying out to Europe tomorrow, but will try to get
you the cleanups some time this week.  Besides the first
four patcehs from Andy, there is a shortlist of a few
more small changes.

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