linux-kernel - Re: [PATCH] [22/28] x86: MCE: Default to panic timeout for machine checks

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Date:	Fri, 17 Apr 2009 20:24:16 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Andi Kleen <andi@...stfloor.org>
CC:	hpa@...or.com, linux-kernel@...r.kernel.org, mingo@...e.hu,
	tglx@...utronix.de
Subject: Re: [PATCH] [22/28] x86: MCE: Default to panic timeout for machine
 checks

Andi Kleen wrote:
> Fatal machine checks can be logged to disk after boot, but only if
> the system did a warm reboot. That's unfortunately difficult with the
> default panic behaviour, which waits forever and the admin has to
> press the power button because modern systems usually miss a reset button.
> This clears the machine checks in the registers and make
> it impossible to log them.
> 
> This patch changes the default for machine check panic to always
> reboot after 30s. Then the mce can be successfully logged after
> reboot.

In case if user already set panic_timeout to 5s, the that user need to
wait extra 25s for machine check panic... ?

The idea is good, but I think some switch like "no_reboot_on_mce" would
be required.


Thanks,
H.Seto

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