Messages in this thread | | | Date | Tue, 27 Mar 2012 19:12:50 +0400 | From | Cyrill Gorcunov <> | Subject | Re: [PATCH] perf, p4: Add format attributes |
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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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