From: Ingo Molnar <mingo@kernel.org>
To: Borislav Petkov <bp@alien8.de>
Cc: Andy Lutomirski <luto@amacapital.net>,
Oleg Nesterov <oleg@redhat.com>, Rik van Riel <riel@redhat.com>,
x86@kernel.org, linux-kernel@vger.kernel.org,
Linus Torvalds <torvalds@linux-foundation.org>
Subject: Re: [RFC PATCH] x86, fpu: Use eagerfpu by default on all CPUs
Date: Sat, 21 Feb 2015 20:23:52 +0100 [thread overview]
Message-ID: <20150221192352.GA10027@gmail.com> (raw)
In-Reply-To: <20150221191527.GC32073@pd.tnic>
* Borislav Petkov <bp@alien8.de> wrote:
> > I'd sleep a lot better if we had some runtime debug
> > flag to be able to do run-to-run comparisons on the
> > same booted up kernel, or so.
>
> Let me take a look whether we could so some knob... The
> nice thing is, code uses use_eager_fpu() to check stuff
> so we should be able to clear the cpufeature flag.
Either that, or you could quickly hack those checks to use
panic_timeout, add an 'extern int panic_timeout;' and after
bootup do:
echo 0 > /proc/sys/kernel/panic
echo 1 > /proc/sys/kernel/panic
to switch between the modes?
Thanks,
Ingo
next prev parent reply other threads:[~2015-02-21 19:23 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-20 18:58 [RFC PATCH] x86, fpu: Use eagerfpu by default on all CPUs Andy Lutomirski
2015-02-20 19:05 ` Borislav Petkov
2015-02-21 9:31 ` Ingo Molnar
2015-02-21 16:38 ` Borislav Petkov
2015-02-21 17:29 ` Borislav Petkov
2015-02-21 18:39 ` Ingo Molnar
2015-02-21 19:15 ` Borislav Petkov
2015-02-21 19:23 ` Ingo Molnar [this message]
2015-02-21 21:36 ` Borislav Petkov
2015-02-22 8:18 ` Ingo Molnar
2015-02-22 8:22 ` Ingo Molnar
2015-02-22 10:48 ` Borislav Petkov
2015-02-22 12:50 ` Borislav Petkov
2015-02-22 12:57 ` Ingo Molnar
2015-02-22 13:21 ` Borislav Petkov
2015-02-22 0:34 ` Maciej W. Rozycki
2015-02-22 2:18 ` Andy Lutomirski
2015-02-22 11:06 ` Borislav Petkov
2015-02-23 1:45 ` Rik van Riel
2015-02-23 5:22 ` Andy Lutomirski
2015-02-23 12:51 ` Rik van Riel
2015-02-23 15:03 ` Borislav Petkov
2015-02-23 15:51 ` Rik van Riel
2015-02-23 18:06 ` Borislav Petkov
2015-02-23 21:17 ` Maciej W. Rozycki
2015-02-23 21:21 ` Rik van Riel
2015-02-23 22:14 ` Linus Torvalds
2015-02-24 0:56 ` Maciej W. Rozycki
2015-02-24 0:59 ` Andy Lutomirski
2015-02-23 22:27 ` Maciej W. Rozycki
2015-02-23 23:44 ` Andy Lutomirski
2015-02-24 2:14 ` Maciej W. Rozycki
2015-02-24 2:31 ` Andy Lutomirski
2015-02-24 14:43 ` Rik van Riel
2015-02-21 18:34 ` Ingo Molnar
2015-02-23 14:59 ` Oleg Nesterov
2015-02-23 15:11 ` Borislav Petkov
2015-02-23 15:53 ` Rik van Riel
2015-02-23 18:40 ` Oleg Nesterov
2015-02-24 19:15 ` Denys Vlasenko
2015-02-25 0:07 ` Andy Lutomirski
2015-02-25 10:37 ` Borislav Petkov
2015-02-25 10:50 ` Ingo Molnar
2015-02-25 10:45 ` Ingo Molnar
2015-02-25 17:12 ` Some results (was: Re: [RFC PATCH] x86, fpu: Use eagerfpu by default on all CPUs) Borislav Petkov
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