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Date: Fri, 13 Mar 2015 13:45:29 +0100
From: Jiri Olsa <jolsa@redhat.com>
To: Ingo Molnar <mingo@kernel.org>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>, linux-kernel@vger.kernel.org,
        Adrian Hunter <adrian.hunter@intel.com>,
        Andi Kleen <ak@linux.intel.com>, Borislav Petkov <bp@suse.de>,
        Corey Ashford <cjashfor@linux.vnet.ibm.com>,
        David Ahern <david.ahern@oracle.com>, Don Zickus <dzickus@redhat.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        He Kuang <hekuang@huawei.com>, Jeremie Galarneau <jgalar@efficios.com>,
        Joonsoo Kim <js1304@gmail.com>,
        Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>,
        Minchan Kim <minchan@kernel.org>, Namhyung Kim <namhyung@kernel.org>,
        Naohiro Aota <naota@elisp.net>, Paul Mackerras <paulus@samba.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        Stephane Eranian <eranian@google.com>,
        Tom Zanussi <tzanussi@gmail.com>, Wang Nan <wangnan0@huawei.com>,
        Arnaldo Carvalho de Melo <acme@redhat.com>
Subject: Re: [GIT PULL 00/24] perf/core improvements and fixes
Message-ID: <20150313124529.GA19571@krava.brq.redhat.com>
References: <1426195684-20046-1-git-send-email-acme@kernel.org>
 <20150313123451.GB28895@gmail.com>
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On Fri, Mar 13, 2015 at 01:34:51PM +0100, Ingo Molnar wrote:
> 
> * Arnaldo Carvalho de Melo <acme@kernel.org> wrote:
> 
> > Infrastructure:
> 
> > . Fix libbabeltrace detection (Jiri Olsa)
> 
> So this still doesn't seem to work for me:
> 
> ...                 libbabeltrace: [ OFF ]
> 
> it should really not be included in the default build until the 
> required library features are more widely available in distros.

the patch that moves babeltrace out of default
check wasn't pulled in yet:

http://marc.info/?l=linux-kernel&m=142606453815125&w=2

also note there's another bug in test-all that prevents
the test-all speed up, fixed by this patch:

http://marc.info/?l=linux-kernel&m=142606452415123&w=2

> 
> I think we should only use library features by default that are 
> available in the latest Fedora, SuSE and Ubuntu distros. We want them 
> to build and package perf and there's little point in adding features 
> that won't work on packaged up perf.

I think we should have the possibility to work and commit new
features even if the support is not yet in the main distros

for such features we could:
  - leave those features out of the default features check
    like we'll do for babeltrace
  - maybe use some sort of EXPERIMENTAL config option dependency
    once we have the .config file support ;-)

jirka