printk flushing?

[Juan Piernas Cánovas]

Todd wrote:
> 
> folx,
> 
> i'm doing some data gathering in the linux network stack by means of a few
> printk in the fragment reassembly and fragment dropping code.  the problem
> is that ocassionally i'm getting what look like buffer overflows when the
> pace of printk's is too fast.  i've looked through printk and just don't
> understand it well enough to figure this out, so i was hoping for some
> help.
> 
> is there any easy way to flush the printk buffers onto disk?
> 
> or, put another way,
> 
> is there any way to ensure that relatively high volume printk statements
> get cleanly output to logs?
> 
> thanks very much for any help,
Hi!.

A solution is enlarge the message buffer at kernel/printk.c but this is
not a safety solution.

Well, I have a little kernel patch and two userland programs that make
printk blocking/unblocking when you want. I also disable klogd and
syslogd daemons and execute "cat /proc/kmsg > myfile" to collect
messages. Send me an e-mail if you are interested in them.

Bye.
-- 
D. Juan Piernas Cánovas
Departamento de Ingeniería y Tecnología de Computadores
Facultad de Informática. Universidad de Murcia
Campus de Espinardo - 30080 Murcia (SPAIN)
Tel.: +34968364633    Fax: +34968364151
email: piernas en ditec.um.es



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