linux-kernel - Re: [PATCH 1/4] perf, tools: Add support for prepending LBRs to the callstack

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Date:	Sat, 11 Jan 2014 16:16:57 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Jiri Olsa <jolsa@...hat.com>, linux-kernel@...r.kernel.org,
	namhyung@...nel.org, eranian@...gle.com, fweisbec@...il.com,
	mingo@...nel.org, adrian.hunter@...el.com, dsahern@...il.com,
	Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 1/4] perf, tools: Add support for prepending LBRs to the
 callstack

Em Sat, Jan 11, 2014 at 06:58:16PM +0100, Andi Kleen escreveu:
> On Sat, Jan 11, 2014 at 04:36:14PM +0100, Jiri Olsa wrote:
> > On Fri, Jan 10, 2014 at 04:32:03AM -0800, Andi Kleen wrote:
> > > From: Andi Kleen <ak@...ux.intel.com>
> > > 
> > > I never found the default LBR display mode which generates histograms
> > > of individual branches particularly useful.
> > > 
> > > This implements an alternative mode that creates histograms over complete
> > > branch traces, instead of individual branches, similar to how normal
> > > callgraphs are handled. This is done by putting it in
> > > front of the normal callgraph and then using the normal callgraph
> > > histogram infrastructure to unify them.
> > > 
> > > This way in complex functions we can understand the control flow
> > > that lead to a particular sample.
> > > 
> > > The default output is unchanged.
> > > 
> > > This is only implemented in perf report, no change to record
> > > or anywhere else.
> > > 
> > > This adds the basic code to report:
> > > - add a new "branch" option to the -g option parser to enable this mode
> > > - when the flag is set include the LBR into the callstack in machine.c.
> > > The rest of the history code is unchanged and doesn't know the difference
> > > between LBR entry and normal call entry.
> > 
> > sounds like nice idea, but I could not get the patchset applied
> > on acme's perf/core
> 
> It was on Linus master.
> 
> I tried to rebase on perf/core, but it seems to be totally broken by
> itself. All the config tests fail on my opensuse system.
> 
> Arnaldo?

Oops, checking on some systems...
 
> Auto-detecting system features:
> ...                     backtrace: [ OFF ]
> ...                         dwarf: [ OFF ]
> ...                fortify-source: [ OFF ]
> ...                         glibc: [ OFF ]
> ...                          gtk2: [ OFF ]
> ...                  gtk2-infobar: [ OFF ]
> ...                      libaudit: [ OFF ]
> ...                        libbfd: [ OFF ]
> ...                        libelf: [ OFF ]
> ...             libelf-getphdrnum: [ OFF ]
> ...                   libelf-mmap: [ OFF ]
> ...                       libnuma: [ OFF ]
> ...                       libperl: [ OFF ]
> ...                     libpython: [ OFF ]
> ...             libpython-version: [ OFF ]
> ...                      libslang: [ OFF ]
> ...                     libunwind: [ OFF ]
> ...                       on-exit: [ OFF ]
> ...            stackprotector-all: [ OFF ]
> ...                       timerfd: [ OFF ]
> 
> config/Makefile:282: *** No gnu/libc-version.h found, please install
> glibc-dev[el]/glibc-static.  Stop.
> make: *** [all] Error 2
> 
> -Andi
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