Re: [PATCH 0/6] loglevel=pci:8,acpi:8,apic=8 support v6

H. Peter Anvin
2008-09-17T19:27:23Z

Jason Baron wrote:
>
> hi,
>
> indeed both proposals seem to be addressing a similar core issue - being
> able to dynamically (as opposed to re-compiling) change the amount of
> verbosity that the kernel spews. I would liken it to adding a -verbose
> flag to the kernel.
>
> Beyond that the 2 approaches differ in a number of ways as I see:
>

8) The ability to accessed filtered messages a posteori (via dmesg),
which is something we currently take for granted.

This *is* the fundamental difference between what Yinghai has now and
both your stuff and Yinghai's original proposal. Not producing the
additional messages at all is inherently cheaper, sometimes *much*
cheaper, but it obviously means the information is not accessible at all.

At the moment, I would argue that the fact that dmesg is, in effect,
more verbose than the kernel itself is a good thing; it makes dmesg
dumps more useful.

-hpa