linux-kernel - Re: [PATCH -tip 3/3] x86, mce: Add mce=nopoll option to disable timer polling

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Message-ID: <49D08BC7.6070002@jp.fujitsu.com>
Date:	Mon, 30 Mar 2009 18:07:19 +0900
From:	Hidetoshi Seto <seto.hidetoshi@...fujitsu.com>
To:	Andi Kleen <ak@...ux.intel.com>
CC:	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...e.hu>
Subject: Re: [PATCH -tip 3/3] x86, mce: Add mce=nopoll option to disable timer
 polling

Andi Kleen wrote:
>>> Also I'm not sure a boot argument is really needed. Isn't it
>>> good enough to do this early at boot through sysfs?
>> Maybe it is good for this option, as far as polling never run
>> so soon.  Because sysfs is available after start of polling
>> timer, boot argument is required just in theory of logics.
> 
> I think the best way would be to just not run mcelog if you want
> the BIOS to log all. The only problem I guess is that users might be confused
> by the printk. So perhaps just do a patch to shut down the printk?

How to prevent banks from clearing?

>> One another problem is that there are multiple documentations for
>> machinecheck parameters, but not linked well:
>>
>>  - Documentation/kernel-parameters.txt
>>     ("See Documentation/x86/x86_64/boot-options.txt" for "mce=")
>>  - Documentation/x86/x86_64/boot-options.txt
>>     ("AMD64 specific boot options" is not true now!)
>>  - Documentation/x86/x86_64/machinecheck
>>     (which I had not noticed the existence at first, oops!)
> 
> machinecheck is for the sysfs interface, boot options is for the boot parameters.
> 
> I guess a reference could be added to machinecheck to point to boot-options.txt

Vice verse, I suppose.
boot-options.txt just have "Everything else is in sysfs now." without pointing
machinecheck that describe the sysfs well.


Thanks,
H.Seto

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