Re: perf hw in kexeced kernel broken in tip

Peter Zijlstra
2010-12-08T15:15:31Z

On Wed, 2010-12-08 at 10:02 -0500, Vivek Goyal wrote:

> >but its kdump so its mostly broken by design anyway ;-)
>
> Kdump has its share of problems especially with the fact that
> kernel/drivers find devices in bad state and are not hardened enough
> to deal with that. But on bare metal what's the better way of capturing
> kernel crash dump? Trying to do anything post crash in the kernel is
> also not very reliable either.

/me <3 RS-232

I haven't found anything better than that...

And poking at the RS-232 requires less of the kernel to be functional
than booting into a new kernel (whose image might have been corrupted by
the dying kernel, etc..)