On Tue, Feb 21, 2006 at 01:16:50AM -0800, David S. Miller wrote:
> From: Ingo Molnar <[email protected]>
> Date: Tue, 21 Feb 2006 04:09:58 -0500 (EST)
>
> > i changed soft lockup detection to be turned off during bootup. That
> > should work around any boot-time warnings.
>
> Excellent.
I don't like it. We should instead just have printk tickle the watchdog.
> > (if this can happen on a booted up system then the real fix would indeed
> > be to split up register_console()'s workload - that would also make it
> > more preemption-friendly. But at first sight it looks quite complex to
> > do.)
>
> Agreed. I thought about buffering in the slow console driver itself
> but that's bad because if it's a crash message we might not get the
> events (interrupts, or whatever) in order to make forward progress
> printing out the buffer, and thus we'd lose the valuable messages.
Absolutely.
Also note that sysrq-t can be substantially worse than the the
boot-time dump if you've got a lot of processes. So the boot-time hack
is insufficient. Even at 115kbps, this can be several seconds.
--
Mathematics is the supreme nostalgia of our time.
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