From: Ingo Molnar <mingo-X9Un+BFzKDI@public.gmane.org>
To: "Ahmed S. Darwish" <darwish.07-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: "Willy Tarreau"
<wtarreau-Dj75qbTlC0E76Z2rM5mHXA@public.gmane.org>,
"Dirk Hohndel" <hohndel-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>,
"Frédéric Weisbecker"
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"Randy Dunlap" <rdunlap-/UHa2rfvQTnk1uMJSBkQmQ@public.gmane.org>,
"James Bottomley" <James.Bottomley-l3A5Bk7waGM@public.gmane.org>,
"H. Peter Anvin" <hpa-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>,
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"Eric Biederman" <ebiederm@xmission.c>
Subject: Re: [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk upon panic
Date: Wed, 26 Jan 2011 13:58:13 +0100 [thread overview]
Message-ID: <20110126125813.GA26952@elte.hu> (raw)
In-Reply-To: <20110126124954.GC24527@laptop>
* Ahmed S. Darwish <darwish.07-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> - The latest approach (proposed by Linus) is to forget the disk: jump to
> real-mode, but display the kernel log in a fancy format (with scroll
> ups and downs) instead.
>
> Will re-initializing the VGA registers to their POST state be possible?
> If not, what about a "fail-safe" VGA driver?
>
> I'm most likely going to implement either the second or the third point,
> so I'd really appreciate some input.
The third one suggested by Linus is the most useful and most direct one IMO. Such a
'oops mode' screen would be useful for regular kernel crashes as well.
Also, have you tried BIOS warm reset vector, which is supposed to reboot without
clearing RAM contents - how well does it work in practice on typical laptops? If on
crash we could reboot without memory getting cleared that would open up a vast area
of space to store the kernel log into (RAM).
Thanks,
Ingo
next prev parent reply other threads:[~2011-01-26 12:58 UTC|newest]
Thread overview: 50+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-25 13:47 [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk upon panic Ahmed S. Darwish
2011-01-25 13:51 ` [PATCH -next 1/2][RFC] x86: Saveoops: Switch to real-mode and call BIOS Ahmed S. Darwish
2011-01-25 17:26 ` H. Peter Anvin
2011-01-25 13:53 ` [PATCH -next 2/2][RFC] x86: Saveoops: Reserve low memory and register code Ahmed S. Darwish
2011-01-25 17:29 ` H. Peter Anvin
2011-01-26 9:04 ` Ahmed S. Darwish
2011-01-25 14:09 ` [PATCH 0/2][concept RFC] x86: BIOS-save kernel log to disk upon panic Ingo Molnar
2011-01-25 15:08 ` Tejun Heo
2011-01-25 17:33 ` H. Peter Anvin
2011-01-26 11:44 ` Ahmed S. Darwish
2011-02-03 14:36 ` Pavel Machek
2011-02-03 15:28 ` H. Peter Anvin
2011-02-03 17:57 ` Ingo Molnar
2011-02-03 21:07 ` H. Peter Anvin
2011-01-25 15:36 ` Ahmed S. Darwish
2011-01-25 16:02 ` James Bottomley
2011-01-25 17:05 ` Ahmed S. Darwish
2011-01-25 17:20 ` James Bottomley
2011-01-25 22:10 ` Mark Lord
2011-01-25 22:16 ` Randy Dunlap
2011-01-25 22:45 ` Jeff Garzik
2011-01-25 22:58 ` H. Peter Anvin
2011-01-26 0:26 ` Jeff Garzik
2011-01-31 2:59 ` Rusty Russell
2011-01-31 10:45 ` Ingo Molnar
2011-01-25 17:32 ` Tony Luck
2011-01-25 17:36 ` H. Peter Anvin
2011-01-25 19:04 ` Jeff Garzik
2011-01-25 14:49 ` Tejun Heo
2011-01-28 7:59 ` Jan Ceuleers
2011-01-25 20:25 ` Linus Torvalds
[not found] ` <AANLkTinU0KYiCd4p=z+=ojbkeEoT2G+CAYvdRU02KJEn-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2011-01-26 12:49 ` Ahmed S. Darwish
2011-01-26 12:58 ` Ingo Molnar [this message]
[not found] ` <20110126125813.GA26952-X9Un+BFzKDI@public.gmane.org>
2011-01-26 13:34 ` Ahmed S. Darwish
2011-01-26 14:00 ` Ingo Molnar
[not found] ` <20110126140030.GB30064-X9Un+BFzKDI@public.gmane.org>
2011-01-27 4:35 ` H. Peter Anvin
[not found] ` <4D40F5FD.6090507-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2011-01-27 11:41 ` Ingo Molnar
[not found] ` <20110127114113.GB20279-X9Un+BFzKDI@public.gmane.org>
2011-01-27 15:47 ` Eric W. Biederman
[not found] ` <m1aaimxs9h.fsf-+imSwln9KH6u2/kzUuoCbdi2O/JbrIOy@public.gmane.org>
2011-01-27 16:12 ` H. Peter Anvin
2011-01-26 23:07 ` Luck, Tony
[not found] ` <987664A83D2D224EAE907B061CE93D53019438EABF-osO9UTpF0URqS6EAlXoojrfspsVTdybXVpNB7YpNyf8@public.gmane.org>
2011-01-26 23:16 ` Dave Jones
[not found] ` <20110126231620.GA14807-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-01-26 23:21 ` Luck, Tony
[not found] ` <20110126233033.GB14807@redhat.com>
[not found] ` <987664A83D2D224EAE907B061CE93D53019438EBB6@orsmsx505.amr.corp.intel.com>
[not found] ` <4D40F7F1.3020509@zytor.com>
[not found] ` <20110127120039.GD20279@elte.hu>
2011-01-27 18:35 ` Luck, Tony
[not found] ` <4D4197CB.9070201@zytor.com>
[not found] ` <20110127162429.GB26437@elte.hu>
2011-01-27 18:56 ` Luck, Tony
2011-01-27 1:09 ` Ahmed S. Darwish
[not found] ` <20110127021338.GA20334@redhat.com>
[not found] ` <20110127021338.GA20334-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2011-01-27 3:33 ` Ahmed S. Darwish
2011-01-27 4:44 ` H. Peter Anvin
[not found] ` <4D40F81E.1030009-YMNOUZJC4hwAvxtiuMwx3w@public.gmane.org>
2011-01-27 5:26 ` Ahmed S. Darwish
2011-01-27 7:51 ` Eric W. Biederman
2011-02-02 11:13 ` Ahmed S. Darwish
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