On Thu, Jan 05, 2006 at 09:15:02AM +0100, Jan Engelhardt wrote:
> Here's something interesting too:
> Sometimes, an oops is even longer than 25 rows, and the usual user
> does not have
> - VGA mode with a lot of lines (because it's hard to read)
> - FB mode with a lot of lines (slow, and it's also hard to read)
See the other patch I sent which halves the amount of lines needed
for a backtrace on i386 (like x86-64 uses). This helps too.
> Is it be possible to change the VGA mode to 80x43/80x50/80x60
> during protected mode?
After an oops, we can't really rely on anything. What if the
oops came from the console layer, or a framebuffer driver?
> >With this patch, if we oops, there's a pause for a two minutes..
> >which hopefully gives people enough time to grab a digital camera
> >to take a screenshot of the oops.
> >
> It would be ideal to have something like BSD's "dump to predefined
> block device on oops", so extraction of oops logs requires neither
> pen-and-paper nor a digital camera. Requires another partition that
> can be used for it, though.
I dislike most of the disk dump patches that I've seen out there
because most of them rely on the system being in a decent enough
state to be able to write out blocks of data.
If I had any faith in the sturdyness of the floppy driver, I'd
recommend someone looked into a 'dump oops to floppy' patch, but
it too relies on a large part of the system being in a sane
enough state to write blocks out to disk.
> (*) If the oops is longer than 25 lines, ... you can't even use scrollback
> because scrollback is cleared when you change consoles. X runs by default
> on tty7, and the kernel dumps it somewhere else. (And even if it dumped to
> tty7 directly, you would not see it.)
What to do about oopses whilst in X has been the subject of much
head-scratching for years now. It's come up at least at the
last two kernel summits, and I'll hazard a guess it'll come up
again this year. The amount of work necessary to make it all
work on both kernel side and X side isn't unsubstantial however,
so I wouldn't count on it working too soon.
Hmm, SuSE/Novell folks, doesn't NKLD take over an X display?
ISTR during a demo at last years OLS the presenter was flipping
in/out of the debugger between slides. Is there anything
useful there ?
Dave
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