Re: [PATCH] documentation for basic guide to profiling

[Dave Hansen <haveblue@us.ibm.com>]

Martin J. Bligh wrote:
>>>Alpha is supported too... (as least I saw the kernel part go in)
>>
>>sparc64 and ppc64 too, but only timer tick profiling so far.
> 
> I need the magic incantation for oprofile for these then ...
> 
> Actually, better still, we need a wrapper script that works out this
> from /proc/cpuinfo and auto-sets it up for you, if someone who knows
> enough about different Pentium types knows how ... I'm happy to go
> write it if it's easy to detect ...
> 
> My laptop says: 
> 
> model name      : Pentium III (Coppermine)
> 
> but a list of pattern matches from someone (or list of people) who
> know how this works would be very helpful (ie matching up cpuinfo
> to magic incantation to oprofile).

Actually, oprofile already does this somehow.  opcontrol --list-events
will tell you the perf counters for your particular CPU.  When my
scripts are deciding whether the machine is P3/4, they grep through this
list.

I think the proper way to do this is in oprofile itself.  John mentioned
earlier in this thread that they have considered doing default events,
but there may be a better way to do it.
-- 
Dave Hansen
haveblue@us.ibm.com