Messages in this thread | | | Date | Mon, 16 Dec 2013 15:37:51 +0100 | From | Ingo Molnar <> | Subject | Re: [PATCH v0 00/71] perf: Add support for Intel Processor Trace |
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* Alexander Shishkin <alexander.shishkin@linux.intel.com> wrote:
> > One good approach to do that would be to unify the BTS and PT > > tooling (the kernel side can be unified as well, to the extent it > > makes sense), and to prove it via actual functionality that this > > stuff matters. BTS is available widely, so the tooling can be > > tested by anyone who's interested. > > > > Allow people to record crashes in core dumps, allow them to look > > at histograms/spectrograms of BTS/PT traces, zoom in on actual > > traces, etc. - make it easier to handle this huge amount of data > > and visualize traces in other ways you find useful, etc. > > > > None of that is done right now via BTS so nobody uses it. > > So I can make BTS appear as an "itrace" pmu similarly to PT. One > question that comes to mind is should we then dispose of the old > interface that's used for accessing BTS functionality or make it > coexist with the new one.
So we could make the old ABI a CONFIG_PERF_EVENTS_COMPAT_X86_BTS kind of legacy option, turned off by default. That allows us its eventual future phasing out.
It all depends on how useful the new tooling becomes: if interesting things can be done with it via an obvious, powerful interface then people might start using it.
Thanks,
Ingo
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