linux-kernel - Re: [RFC PATCH 04/11] x86,fpu: defer FPU restore until return to userspace

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Date:	Wed, 14 Jan 2015 18:56:08 +0100
From:	Oleg Nesterov <oleg@...hat.com>
To:	Rik van Riel <riel@...hat.com>
Cc:	linux-kernel@...r.kernel.org, mingo@...hat.com, hpa@...or.com,
	matt.fleming@...el.com, bp@...e.de, pbonzini@...hat.com,
	tglx@...utronix.de, luto@...capital.net
Subject: Re: [RFC PATCH 04/11] x86,fpu: defer FPU restore until return to
	userspace

On 01/13, Rik van Riel wrote:
>
> -----BEGIN PGP SIGNED MESSAGE-----
> Hash: SHA1
>
> On 01/13/2015 01:30 PM, Oleg Nesterov wrote:
> > On 01/13, Oleg Nesterov wrote:
> >>
> >> But yes, I think we need the per-cpu "in_kernel_fpu" and
> >> irq_fpu_usable() must die. Please look at
> >> http://marc.info/?l=linux-kernel&m=14096628660929
>
> This link does not work for me. I wonder if that email is not
> on the marc.info node I managed to send my http request to...

Sorry, copy-and-paste error,
http://marc.info/?l=linux-kernel&m=140966286609295

> > Plus I think we need this to fix the race with
> > math_state_restore()... Please see
> > http://marc.info/?l=linux-kernel&m=140992479607206
> >
> > Unfortunately I forgot other problems I found in this area... And I
> > completely forgot the plan I had in mind ;)
>
> That I can certainly merge into my series.

Perhaps I should resend this series... I'll recheck, it should not
conflict with your changes (at least too much).

Oleg.

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