From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1751706AbbCIXLp (ORCPT <rfc822;w@1wt.eu>);
	Mon, 9 Mar 2015 19:11:45 -0400
Received: from mx1.redhat.com ([209.132.183.28]:52698 "EHLO mx1.redhat.com"
	rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP
	id S1750753AbbCIXLo (ORCPT <rfc822;linux-kernel@vger.kernel.org>);
	Mon, 9 Mar 2015 19:11:44 -0400
Date: Mon, 9 Mar 2015 20:11:19 -0300
From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: Jiri Olsa <jolsa@redhat.com>
Cc: Jiri Olsa <jolsa@kernel.org>, linux-kernel@vger.kernel.org,
        Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
        David Ahern <dsahern@gmail.com>,
        Frederic Weisbecker <fweisbec@gmail.com>,
        Jeremie Galarneau <jgalar@efficios.com>,
        Namhyung Kim <namhyung@gmail.com>, Paul Mackerras <paulus@samba.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Tom Zanussi <tzanussi@gmail.com>, Wang Nan <wangnan0@huawei.com>
Subject: Re: [PATCH 05/11] perf data: Add tracepoint events fields CTF
 conversion support
Message-ID: <20150309231119.GD14515@redhat.com>
References: <1424470628-5969-1-git-send-email-jolsa@kernel.org>
 <1424470628-5969-6-git-send-email-jolsa@kernel.org>
 <20150225192344.GH18705@kernel.org>
 <20150301132043.GA17097@krava.redhat.com>
 <20150302153220.GD6723@redhat.com>
 <20150309121203.GF27885@krava.brq.redhat.com>
 <20150309215121.GB14515@redhat.com>
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
In-Reply-To: <20150309215121.GB14515@redhat.com>
X-Url: http://acmel.wordpress.com
User-Agent: Mutt/1.5.20 (2009-12-10)
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org

Em Mon, Mar 09, 2015 at 06:51:21PM -0300, Arnaldo Carvalho de Melo escreveu:
> Doesn't work as well...
> 
> :-\
> 
> Will try debugging...

So I tried checkout out before Ingo's changes to libbabeltrace detection, i.e.:

[acme@zoo linux]$ git checkout -b ttmp 9a75606ca06d94aab1ed0dbe96935e3f89dfb81c

And it works:

[acme@zoo linux]$ git checkout ttmp
Switched to branch 'ttmp'
[acme@zoo linux]$ rm -rf /tmp/build/perf ; mkdir -p /tmp/build/perf ; time make LIBBABELTRACE_DIR=/opt/libbabeltrace/ -C tools/perf O=/tmp/build/perf install-bin
make: Entering directory `/home/git/linux/tools/perf'
  BUILD:   Doing 'make -j4' parallel build

Auto-detecting system features:
...                         dwarf: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ on  ]
...                      libaudit: [ on  ]
...                        libbfd: [ on  ]
...                        libelf: [ on  ]
...                       libnuma: [ on  ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                      libslang: [ on  ]
...                     libunwind: [ on  ]
...            libdw-dwarf-unwind: [ on  ]
...                 libbabeltrace: [ on  ]
...                          zlib: [ on  ]
...     DWARF post unwind library: libunwind

  MKDIR    /tmp/build/perf/util/

But if I checkout tip/perf/core:

[acme@zoo linux]$ git checkout -b ttmp2 tip/perf/core
Branch ttmp2 set up to track remote branch perf/core from tip.
Switched to a new branch 'ttmp2'
[acme@zoo linux]$ rm -rf /tmp/build/perf ; mkdir -p /tmp/build/perf ; time make LIBBABELTRACE_DIR=/opt/libbabeltrace/ -C tools/perf O=/tmp/build/perf install-bin
make: Entering directory `/home/git/linux/tools/perf'
  BUILD:   Doing 'make -j4' parallel build
config/Makefile:709: No libbabeltrace found, disables 'perf data' CTF format support, please install libbabeltrace-dev[el]/libbabeltrace-ctf-dev

Auto-detecting system features:
...                         dwarf: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ on  ]
...                      libaudit: [ on  ]
...                        libbfd: [ on  ]
...                        libelf: [ on  ]
...                       libnuma: [ on  ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                      libslang: [ on  ]
...                     libunwind: [ on  ]
...            libdw-dwarf-unwind: [ on  ]
...                 libbabeltrace: [ OFF ]
...                          zlib: [ on  ]
...     DWARF post unwind library: libunwind

  MKDIR    /tmp/build/perf/util/

It doesn't work, bisecting:

[acme@zoo linux]$ git bisect bad
b49f1a4be701c2386ccc7496dc8442cf26424d5c is the first bad commit
commit b49f1a4be701c2386ccc7496dc8442cf26424d5c
Author: Ingo Molnar <mingo@kernel.org>
Date:   Sat Feb 28 10:16:27 2015 +0100

    perf tools: Improve feature test debuggability
    
    Certain feature tests fail with link errors:

--------------------------------------------------------------

Ran out of time, will continue later/tomorrow.

- Arnaldo