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

[H. Peter Anvin]

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
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