linux-kernel - Re: [PATCH] printk: add halt_delay parameter for printk delay in halt phase

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Message-ID: <a8e1da0906111821h17d11886rfc194b6e22739f63@mail.gmail.com>
Date:	Fri, 12 Jun 2009 09:21:29 +0800
From:	Dave Young <hidave.darkstar@...il.com>
To:	Pavel Machek <pavel@....cz>
Cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] printk: add halt_delay parameter for printk delay in halt 
	phase

On Thu, Jun 11, 2009 at 10:43 PM, Pavel Machek<pavel@....cz> wrote:
> On Tue 2009-06-02 17:54:52, Dave Young wrote:
>> Add a halt_delay module parameter in printk.c used to read the printk
>> messages in halt/poweroff/restart phase, delay each printk messages
>> by halt_delay milliseconds. It is useful for debugging if there's no
>> other way to dump kernel messages that time.
>>
>> halt_delay default value is 0, change it by:
>>
>> echo xxx > /sys/module/printk/parameters/halt_delay
>
> Well, stopping oopses from scrolling offscreen was very useful for me
> in past.
>
>> +static inline void halt_delay_msec(void)
>> +{
>> +     if (halt_delay == 0 || !(system_state == SYSTEM_HALT
>> +                             || system_state == SYSTEM_POWER_OFF
>> +                             || system_state == SYSTEM_RESTART))
>> +             return;
>> +
>> +     mdelay(halt_delay);
>
> ...but this will not trigger for oops, right?

Hi, Pavel, this is for halt phase only.

Andrew suggest to make it a general feature, thus we can enable printk
delay when we want. I will write a new patch for that.

>                                                                Pavel
>
> --
> (english) http://www.livejournal.com/~pavelmachek
> (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
>



-- 
Regards
dave
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