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SubjectRe: [PATCH 5/5] perf, x86: Support Haswell v4 LBR format v2
On Wed, 4 Sep 2013, Andi Kleen wrote:

> > What does this mean? The above values are exported as part of
> > include/uapi/linux/perf_event.h
> > Do they not work yet?
>
> You can filter on the fields, but you can't see them outside
> the kernel driver yet. The patch to see them is still pending.

so you can filter for aborts, but they'll never show up in the lbr[]
sample buffer?

> > > > What happens if you set both in transaction and not in?
> > >
> > > Then you get all branches.
> >
> > so what happens if you set neither "PERF_SAMPLE_BRANCH_IN_TX" nor
> > "PERF_SAMPLE_BRANCH_NO_TX"? Logically you'd get no branches at all,
> > but that can't be true as all code prior to 3.11 didn't set those values.
>
> Then you get all branches too
>
> (that's how all the other filters work too)

This is a really confusing API

so does setting "PERF_SAMPLE_BRANCH_ANY" also enable all of the TX types?

Is leaving branch_sample_type at 0 the same as setting it to all 1s?

Vince




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