> I?ve been looking into the ?kernel looks to be hung at reboot? problem at
> bit. Adding a lot of printf() calls to the relevant parts it looks like it
> actually isn?t hung but busy unmounting filesystems (which we have thousands
> of), flushing disk caches, calling registered callbacks and stuff and
> sometimes it takes a bit longer than usual - probably due to ZFS having stuff
> queued up that needs to be written to disk before it finishes?
>
> Anyway, I?d like to propose that we add some kind of counter/printf() calls
> in that code area so we can see that things are indeed progressing. However,
> I?d probably prefer not to print _every_ filesystem (or registered callbacks
> - a lot of those...) - that generates a lot of output (tried that :-) but
> something like:
>
> Unmounting filesystems:
> 1234 done
> (With the "1234 done? updated something like once per second).
>
> What?s the right/best way to do that from the kernel? In user space I?d just
> call time(&t) at some convenient points and only print something if ?t? has
> changed. :-)
How about updated every 128 unmounts?
if ((i & 0x7f) == i) printf("%i done\n:");
>
> - Peter
--
Rod Grimes rgri...@freebsd.org
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