Re: P4 support

[Philippe E. <ph...@wa...>]

Michael Zayats wrote:

Apologizes Michael, I forget to cc the list :/

> Hello guys,
>
> This is my first post to this list.
>
> I would like to start developing P4 support for OProfile.
>
> Please give me a list of all interfacing points where I will have to 
> get in.
>

for module all arch dependant code would be in module/x86, many
code are reusable as it (syscall interception), some code needs small
tweak (apic setup) some need a complete rewrite (sysctl handling).

> Any suggestions, warnings, something I have to know are highly welcome
>

look also (not exhaustive) :

libop/*
utils/op_start

For a start you can avoid most of this this work if you re-use the current
events interface. In this case you only need to map logical events
to hw events in module (e.g. you define P4_CPU_CLK_UNHALTED
and in module you program the P4 pmc to count CLK_UNHALTED)
For this look libop/* and how we differentiate AMD/INTEL in module/x86

regards,
Phil