linux-kernel - Re: probe + report for following branch history. was Re: [PATCH 1/2] perf hists browser: Print overhead percent value for first-level callchain

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Date:	Mon, 24 Nov 2014 12:25:41 -0300
From:	Arnaldo Carvalho de Melo <acme@...nel.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Ingo Molnar <mingo@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Namhyung Kim <namhyung.kim@....com>,
	LKML <linux-kernel@...r.kernel.org>,
	Jiri Olsa <jolsa@...hat.com>, David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Brendan Gregg <brendan.d.gregg@...il.com>
Subject: Re: probe + report for following branch history. was Re: [PATCH 1/2]
 perf hists browser: Print overhead percent value for first-level callchain

Em Mon, Nov 24, 2014 at 12:23:12PM -0300, Arnaldo Carvalho de Melo escreveu:
> Em Mon, Nov 24, 2014 at 11:52:27AM -0300, Arnaldo Carvalho de Melo escreveu:
> > Em Mon, Nov 24, 2014 at 05:13:26PM +0900, Namhyung Kim escreveu:
> > > Currently perf report on TUI doesn't print percent for first-level
> > > callchain entry.  I guess it (wrongly) assumes that there's only a
> > > single callchain in the first level.  This patch fixes it by handling
> > > the first level callchains same as others - if it's not 100% it should
> > > print the percent value.  Also it'll affect other callchains in the
> > > other way around - if it's 100% (single callchain) it should not print
> > > the percentage.
> > > 
> > > Before:
> > >   -   30.95%     6.84%  abc2     abc2              [.] a
> > >      - a
> > 
> > Thanks, with this the --stdio output matches --tui when --branch-history
> > is used in 'report', will push soon.
> 
> [acme@zoo linux]$ time make -C tools/perf build-test
> make: Entering directory `/home/git/linux/tools/perf'
> - make_pure: cd . && make -f Makefile DESTDIR=/tmp/tmp.z11aKMiurz 

Right to the point:

[acme@zoo linux]$ make -C tools/perf NO_DEMANGLE=1 util/srcline.o
make: Entering directory `/home/git/linux/tools/perf'
  BUILD:   Doing 'make -j4' parallel build
  CC       util/srcline.o
In file included from util/srcline.c:18:0:
/usr/include/bfd.h:6197:7: error: conflicting types for ‘bfd_demangle’
 char *bfd_demangle (bfd *, const char *, int);
       ^
In file included from util/srcline.c:11:0:
util/symbol.h:35:21: note: previous definition of ‘bfd_demangle’ was
here
 static inline char *bfd_demangle(void __maybe_unused *v,
                     ^
make[1]: *** [util/srcline.o] Error 1
make: *** [util/srcline.o] Error 2
make: Leaving directory `/home/git/linux/tools/perf'
[acme@zoo linux]$ 
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