Re: [PATCH user-cr] Allow for logfile for kernel debug messages (v2)

[Oren Laadan <orenl-RdfvBDnrOixBDgjK7y7TUQ@public.gmane.org>]

Matt Helsley wrote:
> On Wed, Oct 21, 2009 at 05:46:40PM -0400, Oren Laadan wrote:
>> Serge E. Hallyn wrote:
>>> If unspecified, -1 will be sent for logfd to the kernel, and there
>>> will be no debug log.   If specified, then checkpoint and restart
>>> debug msgs will be sent to the logfile.
>> The new interface will cover error reporting, so when run without '-l'
>> both 'checkpoint' and 'restart' (unless asked to run extra silently)
>> need to provide a pipe to the syscall, and if an error occurs, display
>> pull the error reason from the pipe and print it.
> 
> Of course if more than a pipe buf's worth of error data needs to be 
> transferred then that scheme won't work very cleanly --
> checkpoint/restart would always be a multi-task operation. (I just ran
> into this issue with self-checkpoint.)

Of course. IIRC I commented at linux plumbers that error messages
should (as in must) fit there, as opposed to log/debug messages.

Oren.