linux-kernel - Re: [PATCH] x86, fpu: avoid FPU lazy restore after suspend

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Message-ID: <CAP_ceTz-63+vpg3dMr8Xc2dek0SUWvV3nJAwQWj_GYP07Wcsgg@mail.gmail.com>
Date:	Fri, 30 Nov 2012 13:45:42 -0800
From:	Vincent Palatin <vpalatin@...omium.org>
To:	"H. Peter Anvin" <hpa@...or.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	"the arch/x86 maintainers" <x86@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Jarkko Sakkinen <jarkko.sakkinen@...el.com>,
	Duncan Laurie <dlaurie@...omium.org>,
	Olof Johansson <olofj@...omium.org>
Subject: Re: [PATCH] x86, fpu: avoid FPU lazy restore after suspend

On Fri, Nov 30, 2012 at 11:55 AM, H. Peter Anvin <hpa@...or.com> wrote:
>
> On 11/30/2012 11:54 AM, Vincent Palatin wrote:
> >>
> > I have done a patch v2 according to your suggestions.
> > I will run the testing on it now.
> > I probably need at least 2 to 3 hours to validate it.
> >
>
> That would be super.  Let me know and I'll queue it up and send a pull
> request with this and a few more urgent things to Linus.


I have done 1000+ cycles so far with patch v3 (on 4-core Ivybridge and
no eagerfpu),
and did not hit my issue.
I let the testing going on,
but wrt the issue after suspend, this fixes it with very high probability
(ie I have never done that many cycles without hitting the issue).

-- 
Vincent
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