Re: software watchdog: it works

[gspujar@hss.hns.com]

Hi,
Thanks a lot for your help. I modified the softdog code and I get the message
logged in my log file on system reboot.

Thanks
Girish





Russell King <rmk@arm.linux.org.uk> on 12/11/2001 05:20:59 PM

To:   Girish S Pujar/HSS@HSS
cc:   linux-kernel@vger.kernel.org, Atul Chowdhry/HSS@HSS

Subject:  Re: software watchdog




On Tue, Dec 11, 2001 at 04:26:07PM +0530, gspujar@hss.hns.com wrote:
> Why is that the printk output not going to syslog although  I have entry in
> /etc/syslog.conf
>
> kern.crit                       /var/log/pbsc.log
> even after I remove the mdelay call.

The machine reboots before syslog gets to run.

What happens is:

     printk();
     reboot();

During that period, syslog is unable to run, and therefore is unable to
write the log message to disk.

> Does it mean that without using "testing" mode ( I cannot beacuse I need a
> reboot) it is not possible to get log  ?

I suppose you could modify softdog to delay the reboot using it's timer
(the timer fires the first time, you check data to see if it's non-zero.
If it's not, increment watchdog_ticktock.data, and set the watchdog to
timeout in 5 seconds, return).

You should probably prevent softdog_write updating the timer if the
data field is non-zero, so once you don't change the behaviour; this
is of course dependent on your test case.

--
Russell King (rmk@arm.linux.org.uk)                The developer of ARM Linux
             http://www.arm.linux.org.uk/personal/aboutme.html