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SubjectRe: [PATCH] perf, p4: Add format attributes
On Tue, Mar 27, 2012 at 05:05:59PM +0200, Peter Zijlstra wrote:
> >
> > Thanks a lot, Peter! This format description is somewhat
> > new to me (I think I've missed when it was introduced first
> > time).
>
> Yeah, its all brand-spanking new stuff.. see
> https://lkml.org/lkml/2012/1/16/146 , Jiri added a full fledged
> bison/yacc parser to perf so we can now write events like:
>
> perf stat -e cpu/event=0xb7,umask=0x01,offcore_rsp=0x500b/
>
> and it uses /sys/bus/event_source/devices/cpu/format/* to figure out how
> to convert that into perf_event_attr::config{,1,2} values.
>
> So with this patch you could, on your P4, write:
>
> perf stat -e cpu/cccr=0x1234,escr=0x4321,ht/
>
> and it would construct the perf_event_attr::config value 0x92344321 for
> you.
>

Ah, I see thanks for the reference, Peter!

> I've still not actually read the P4-PMU specs, so I don't know if
> there's anything more convenient we can do on P4. If there's a
> better/more useful format representation possible, don't hesitate to
> send a patch! :-)

Sure, I'll try to find some time tonight to read this brand
new stuff. And if I find something -- will send out. At moment
your patch should be more than enough ;)

Cyrill


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