linux-kernel - Re: [GIT PULL 00/24] perf/core improvements and fixes

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Date:	Fri, 13 Mar 2015 13:45:29 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	Arnaldo Carvalho de Melo <acme@...nel.org>,
	linux-kernel@...r.kernel.org,
	Adrian Hunter <adrian.hunter@...el.com>,
	Andi Kleen <ak@...ux.intel.com>, Borislav Petkov <bp@...e.de>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <david.ahern@...cle.com>,
	Don Zickus <dzickus@...hat.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	He Kuang <hekuang@...wei.com>,
	Jeremie Galarneau <jgalar@...icios.com>,
	Joonsoo Kim <js1304@...il.com>,
	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Minchan Kim <minchan@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Naohiro Aota <naota@...sp.net>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Stephane Eranian <eranian@...gle.com>,
	Tom Zanussi <tzanussi@...il.com>,
	Wang Nan <wangnan0@...wei.com>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 00/24] perf/core improvements and fixes

On Fri, Mar 13, 2015 at 01:34:51PM +0100, Ingo Molnar wrote:
> 
> * Arnaldo Carvalho de Melo <acme@...nel.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
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