Messages in this thread | | | Date | Wed, 4 Sep 2013 10:21:27 -0400 (EDT) | From | Vince Weaver <> | Subject | Re: [PATCH 5/5] perf, x86: Support Haswell v4 LBR format v2 |
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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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