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Message-ID: <20140227123052.GA11475@gmail.com>
Date: Thu, 27 Feb 2014 13:30:52 +0100
From: Ingo Molnar <mingo@...nel.org>
To: Jiri Olsa <jolsa@...hat.com>
Cc: Arnaldo Carvalho de Melo <acme@...radead.org>,
linux-kernel@...r.kernel.org,
Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
Adrian Hunter <adrian.hunter@...el.com>,
Cody P Schafer <cody@...ux.vnet.ibm.com>,
Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
David Ahern <dsahern@...il.com>,
Frederic Weisbecker <fweisbec@...il.com>,
Jean Pihet <jean.pihet@...aro.org>,
Mike Galbraith <efault@....de>,
Namhyung Kim <namhyung@...nel.org>,
Paul Mackerras <paulus@...ba.org>,
Peter Zijlstra <peterz@...radead.org>,
Stephane Eranian <eranian@...gle.com>,
Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: Re: [GIT PULL 00/12] perf/core improvements and fixes
* Jiri Olsa <jolsa@...hat.com> wrote:
> On Thu, Feb 27, 2014 at 12:46:58PM +0100, Ingo Molnar wrote:
> >
> > * Arnaldo Carvalho de Melo <acme@...radead.org> wrote:
> >
> > > From: Arnaldo Carvalho de Melo <acme@...stprotocols.net>
> > >
> > > Hi Ingo,
> > >
> > > Please consider pulling,
> > >
> > > - Arnaldo
> > >
> > > The following changes since commit 7e74efcf76c16f851df5c838c143c4a1865ea9fa:
> > >
> > > Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core (2014-02-22 17:26:24 +0100)
> > >
> > > are available in the git repository at:
> > >
> > >
> > > git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux tags/perf-core-for-mingo
> > >
> > > for you to fetch changes up to 1029f9fedf87fa6f52096991588fa54ffd159584:
> > >
> > > perf symbols: Check compatible symtab type before loading dso (2014-02-24 16:25:01 -0300)
> > >
> > > ----------------------------------------------------------------
> > > perf/core improvements and fixes
> > >
> > > . Add support for the new DWARF unwinder library in elfutils (Jiri Olsa)
> > >
> > > . Fix build race in the generation of bison files (Jiri Olsa)
> > >
> > > . Further streamline the feature detection display, trimming it a bit to
> > > show just the libraries detected, using VF=1 gets a more verbose output,
> > > showing the less interesting feature checks as well (Jiri Olsa).
> > >
> > > . Check compatible symtab type before loading dso (Namhyung Kim)
> > >
> > > . Check return value of filename__read_debuglink() (Stephane Eranian)
> > >
> > > Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
> > >
> > > ----------------------------------------------------------------
> > > Arnaldo Carvalho de Melo (1):
> > > perf tools: Warn the user about how to enable libunwind support
> > >
> > > Jiri Olsa (9):
> > > perf tests: Fix *.o make tests
> > > perf tests: Add pmu-bison.o make test
> > > perf tools: Fix bison OUTPUT directories dependency
> > > perf tools: Factor features display code
> > > perf tools: Add variable display for VF make output
> > > perf tools: Add feature check for libdw dwarf unwind
> > > perf tools: Add libdw DWARF post unwind support
> > > perf tools: Setup default dwarf post unwinder
> > > perf tests: Add NO_LIBDW_DWARF_UNWIND make test
> > >
> > > Namhyung Kim (1):
> > > perf symbols: Check compatible symtab type before loading dso
> > >
> > > Stephane Eranian (1):
> > > perf symbols: Check return value of filename__read_debuglink()
> > >
> > > tools/perf/Makefile.perf | 24 ++-
> > > tools/perf/arch/x86/Makefile | 5 +
> > > tools/perf/arch/x86/util/unwind-libdw.c | 51 +++++
> > > tools/perf/config/Makefile | 232 +++++++++++++++------
> > > tools/perf/config/feature-checks/Makefile | 6 +-
> > > tools/perf/config/feature-checks/test-all.c | 5 +
> > > .../feature-checks/test-libdw-dwarf-unwind.c | 13 ++
> > > tools/perf/tests/make | 25 ++-
> > > tools/perf/util/dso.c | 4 +-
> > > tools/perf/util/symbol-elf.c | 2 +
> > > tools/perf/util/symbol.c | 61 +++++-
> > > tools/perf/util/unwind-libdw.c | 210 +++++++++++++++++++
> > > tools/perf/util/unwind-libdw.h | 21 ++
> > > 13 files changed, 569 insertions(+), 90 deletions(-)
> > > create mode 100644 tools/perf/arch/x86/util/unwind-libdw.c
> > > create mode 100644 tools/perf/config/feature-checks/test-libdw-dwarf-unwind.c
> > > create mode 100644 tools/perf/util/unwind-libdw.c
> > > create mode 100644 tools/perf/util/unwind-libdw.h
> >
> > Pulled, thanks a lot Arnaldo!
> >
> > Btw., the build output looks weird now - on a system that used to pass
> > all feature tests there's this output:
> >
> > BUILD: Doing 'make -j12' parallel build
> > config/Makefile:288: No libdw DWARF unwind found, Please install
> > elfutils-devel/libdw-dev >= 0.158 and/or set LIBDW_DIR
> >
> > 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: [ OFF ]
> > ... DWARF post unwind library: libunwind
> >
> > but:
> >
> > Package elfutils-devel-0.156-5.fc19.x86_64 already installed and latest version
> >
> > Also, the information content of this line is unclear to me:
> >
> > ... DWARF post unwind library: libunwind
> >
> >
> > what does that line want to tell?
>
> this tells what DWARF unwind library is compiled
> in.. 'libunwind' in this case
So my (stylistic) complaint is that it's really reading weird in a
table generated with the following purpose:
Auto-detecting system features:
Also, we already know that libunwind is present, because just in the
line before it, it says:
... libunwind: [ on ]
So it's doubly confusing. How about not displaying that line at all?
Is there a strong reason to not keep 'OFF' messages on a single line?
> the other choice is 'libdw', which was not detected in your case
> (and thats what the 1st message tells you)
>
> we discussed with Arnaldo, that we would not display warnings for
> missing features by default.. only tell that there are missing
> features and display them for verbose (VF=1) output
That's probably a good plan. I'd suggest the following 'short log' for
failures:
# Auto-detecting system features: 2 libraries are missing. Try 'make VF=1' for a verbose list.
I.e. that way people can notice if the count goes up or down after an
update. Also, that too should be a single line, so that it does not
spam people.
Thanks,
Ingo
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