linux-kernel - Re: [PATCH v2 01/10] perf tools: Integrating the CoreSight decoding library

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Date:   Thu, 18 Jan 2018 10:41:39 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        namhyung@...nel.org, Adrian Hunter <adrian.hunter@...el.com>,
        Mike Leach <mike.leach@....com>, suzuki.poulosi@....com,
        Kim Phillips <kim.phillips@....com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH v2 01/10] perf tools: Integrating the CoreSight decoding
 library

Em Wed, Jan 17, 2018 at 09:06:40AM +0100, Jiri Olsa escreveu:
> On Tue, Jan 16, 2018 at 01:30:33PM -0700, Mathieu Poirier wrote:
> > On 16 January 2018 at 05:15, Jiri Olsa <jolsa@...hat.com> wrote:
> > > On Mon, Jan 15, 2018 at 11:13:05AM -0700, Mathieu Poirier wrote:
> > >> +++ b/tools/build/Makefile.feature
> > >> @@ -66,7 +66,8 @@ FEATURE_TESTS_BASIC :=                  \
> > >>          bpf                             \
> > >>          sched_getcpu                 \
> > >>          sdt                          \
> > >> -        setns
> > >> +        setns                                \
> > >> +     libopencsd
> > >>
> > >>  # FEATURE_TESTS_BASIC + FEATURE_TESTS_EXTRA is the complete list
> > >>  # of all feature tests
> > >> @@ -108,7 +109,8 @@ FEATURE_DISPLAY ?=              \
> > >>           zlib                   \
> > >>           lzma                   \
> > >>           get_cpuid              \
> > >> -         bpf
> > >> +         bpf                 \
> > >> +      libopencsd

> > > we put in this list only generic libraries, this one seems arch
> > > specific please put it into FEATURE_TESTS_EXTRA list

> > I was thinking that libopencsd should fall in the same category as
> > libunwind-arm and libunwind-aarch64.  Both are not architecture
> > specific and used to process traces acquired on ARM platforms.  As
> > such I suggest to keep libopencsd as part of FEATURE_TESTS_BASIC and
> > remove it from under FEATURE_DISPLAY - how does that sound to you?
 
> ok, that sounds good

Hi Jiri,

	Shouldn't libopencsd be treated like libbabeltrace was before
the required version was widely available in distros?

	I.e. these csets should have the rationale for that:

Enabling it once it became widely available:

   24787afbcd01 ("perf tools: Enable LIBBABELTRACE by default")

Disabling it because we would need to get things from tarballs/git
repos, build it in our machines, as requested by Ingo:

  6ab2b762befd ("perf build: Disable libbabeltrace check by default")

- Arnaldo