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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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