linux-kernel - Re: [PATCH 1/2] perf evsel: Fix probing of precise

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Message-ID: <20170614140601.urfu7p3vbe7qnt2u@gmail.com>
Date:   Wed, 14 Jun 2017 16:06:01 +0200
From:   Ingo Molnar <mingo@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Arnaldo Carvalho de Melo <acme@...hat.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        David Ahern <dsahern@...il.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>
Subject: Re: [PATCH 1/2] perf evsel: Fix probing of precise_ip level for
 default cycles event


* Arnaldo Carvalho de Melo <acme@...nel.org> wrote:

> Em Wed, Jun 14, 2017 at 07:45:01AM +0200, Ingo Molnar escreveu:
> >  triton:~/tip> perf report --stdio
> >  unwind: target platform=x86 is not supported
> >  unwind: target platform=x86 is not supported
> >  unwind: target platform=x86 is not supported
> >  unwind: target platform=x86 is not supported
> >  unwind: target platform=x86 is not supported
> >  unwind: target platform=x86 is not supported
> >  unwind: target platform=x86 is not supported
> >  unwind: target platform=x86 is not supported
> 
> > # ========
> > # captured on: Wed Jun 14 07:34:42 2017
> > # hostname : triton
> > # os release : 4.10.0-23-generic
> > # perf version : 4.12.rc5.g9688eb
> > # arch : x86_64
> > # nrcpus online : 12
> > # nrcpus avail : 12
> > # cpudesc : Intel(R) Core(TM) i7-4960X CPU @ 3.60GHz
> > # cpuid : GenuineIntel,6,62,4
> > # total memory : 65917012 kB
> > # cmdline : /home/mingo/bin/perf record /home/mingo/hackbench 10 
> 
> > let me know if you need more info.
> > 
> > Btw., note that there's also this warning:
> > 
> >   unwind: target platform=x86 is not supported
> > 
> > (but that's unrelated to this commit.)
> 
> Ok, what distro? Do you have libunwind-devel installed? [...]

Ubuntu, and the build says:

Auto-detecting system features:
...                         dwarf: [ on  ]
...            dwarf_getlocations: [ on  ]
...                         glibc: [ on  ]
...                          gtk2: [ on  ]
...                      libaudit: [ on  ]
...                        libbfd: [ on  ]
...                        libelf: [ on  ]
...                       libnuma: [ on  ]
...        numa_num_possible_cpus: [ on  ]
...                       libperl: [ on  ]
...                     libpython: [ on  ]
...                      libslang: [ on  ]
...                     libcrypto: [ on  ]
...                     libunwind: [ on  ]
...            libdw-dwarf-unwind: [ on  ]
...                          zlib: [ on  ]
...                          lzma: [ on  ]
...                     get_cpuid: [ on  ]
...                           bpf: [ on  ]

so it's a maximum-features build, right?

Here's the unwind libraries:

triton:~/tip> dpkg -l | grep unwind
ii  libunwind-dev                                        1.1-4.1ubuntu2                                       amd64        library to determine the call-chain of a program - development
ii  libunwind8                                           1.1-4.1ubuntu2                                       amd64        library to determine the call-chain of a program - runtime
ii  libunwind8-dev                                       1.1-4.1ubuntu2                                       amd64        library to determine the call-chain of a program - development

libunwind-dev is installed it appears.

Let me know if you want me to run other tests.

Thanks,

	Ingo