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From: Arnaldo Carvalho de Melo <acme@redhat.com>
To: ahmadkhorrami <ahmadkhorrami@ut.ac.ir>
Cc: Jiri Olsa <jolsa@redhat.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Linux-trace Users <linux-trace-users@vger.kernel.org>,
	Peter Zijlstra <peterz@infradead.org>,
	linux-trace-users-owner@vger.kernel.org,
	Jin Yao <yao.jin@linux.intel.com>
Subject: Re: Wrong Perf Backtraces
Date: Wed, 25 Mar 2020 16:28:58 -0300
Message-ID: <20200325192858.GC19495@redhat.com> (raw)
In-Reply-To: <9551c616b045299482fc9e26281c1062@ut.ac.ir>

Em Wed, Mar 25, 2020 at 11:40:36PM +0430, ahmadkhorrami escreveu:
> Thanks. But should I attach the files to the e-mail?

Which files?

I want just that you run the commands and send us the output from them,
like I'll do here:

[acme@seventh perf]$ perf -vv
perf version 5.6.rc6.g0d33b3435253
                 dwarf: [ on  ]  # HAVE_DWARF_SUPPORT
    dwarf_getlocations: [ on  ]  # HAVE_DWARF_GETLOCATIONS_SUPPORT
                 glibc: [ on  ]  # HAVE_GLIBC_SUPPORT
                  gtk2: [ on  ]  # HAVE_GTK2_SUPPORT
         syscall_table: [ on  ]  # HAVE_SYSCALL_TABLE_SUPPORT
                libbfd: [ on  ]  # HAVE_LIBBFD_SUPPORT
                libelf: [ on  ]  # HAVE_LIBELF_SUPPORT
               libnuma: [ on  ]  # HAVE_LIBNUMA_SUPPORT
numa_num_possible_cpus: [ on  ]  # HAVE_LIBNUMA_SUPPORT
               libperl: [ on  ]  # HAVE_LIBPERL_SUPPORT
             libpython: [ on  ]  # HAVE_LIBPYTHON_SUPPORT
              libslang: [ on  ]  # HAVE_SLANG_SUPPORT
             libcrypto: [ on  ]  # HAVE_LIBCRYPTO_SUPPORT
             libunwind: [ on  ]  # HAVE_LIBUNWIND_SUPPORT
    libdw-dwarf-unwind: [ on  ]  # HAVE_DWARF_SUPPORT
                  zlib: [ on  ]  # HAVE_ZLIB_SUPPORT
                  lzma: [ on  ]  # HAVE_LZMA_SUPPORT
             get_cpuid: [ on  ]  # HAVE_AUXTRACE_SUPPORT
                   bpf: [ on  ]  # HAVE_LIBBPF_SUPPORT
                   aio: [ on  ]  # HAVE_AIO_SUPPORT
                  zstd: [ on  ]  # HAVE_ZSTD_SUPPORT
[acme@seventh perf]$ ldd ~/bin/perf
	linux-vdso.so.1 (0x00007fffcb9cc000)
	libunwind-x86_64.so.8 => /lib64/libunwind-x86_64.so.8 (0x00007f7c58d94000)
	libunwind.so.8 => /lib64/libunwind.so.8 (0x00007f7c58d7a000)
	liblzma.so.5 => /lib64/liblzma.so.5 (0x00007f7c58d51000)
	libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f7c58d30000)
	librt.so.1 => /lib64/librt.so.1 (0x00007f7c58d26000)
	libm.so.6 => /lib64/libm.so.6 (0x00007f7c58be0000)
	libdl.so.2 => /lib64/libdl.so.2 (0x00007f7c58bd8000)
	libelf.so.1 => /lib64/libelf.so.1 (0x00007f7c58bbd000)
	libdw.so.1 => /lib64/libdw.so.1 (0x00007f7c58b1e000)
	libslang.so.2 => /lib64/libslang.so.2 (0x00007f7c58846000)
	libperl.so.5.28 => /lib64/libperl.so.5.28 (0x00007f7c5851e000)
	libc.so.6 => /lib64/libc.so.6 (0x00007f7c58358000)
	libpython2.7.so.1.0 => /lib64/libpython2.7.so.1.0 (0x00007f7c580ee000)
	libz.so.1 => /lib64/libz.so.1 (0x00007f7c580d4000)
	libzstd.so.1 => /lib64/libzstd.so.1 (0x00007f7c58029000)
	libcap.so.2 => /lib64/libcap.so.2 (0x00007f7c58022000)
	libnuma.so.1 => /lib64/libnuma.so.1 (0x00007f7c58014000)
	libbabeltrace-ctf.so.1 => /lib64/libbabeltrace-ctf.so.1 (0x00007f7c57fbe000)
	libgcc_s.so.1 => /lib64/libgcc_s.so.1 (0x00007f7c57fa2000)
	/lib64/ld-linux-x86-64.so.2 (0x00007f7c58dd3000)
	libbz2.so.1 => /lib64/libbz2.so.1 (0x00007f7c57f8e000)
	libcrypt.so.2 => /lib64/libcrypt.so.2 (0x00007f7c57f53000)
	libutil.so.1 => /lib64/libutil.so.1 (0x00007f7c57f4e000)
	libbabeltrace.so.1 => /lib64/libbabeltrace.so.1 (0x00007f7c57f3e000)
	libpopt.so.0 => /lib64/libpopt.so.0 (0x00007f7c57f2e000)
	libuuid.so.1 => /lib64/libuuid.so.1 (0x00007f7c57f24000)
	libgmodule-2.0.so.0 => /lib64/libgmodule-2.0.so.0 (0x00007f7c57f1e000)
	libglib-2.0.so.0 => /lib64/libglib-2.0.so.0 (0x00007f7c57dfa000)
	libpcre.so.1 => /lib64/libpcre.so.1 (0x00007f7c57d86000)
[acme@seventh perf]$

Just like a did, no attachments please.

- Arnaldo
 
> On 2020-03-25 23:28, Arnaldo Carvalho de Melo wrote:
> 
> >Em Wed, Mar 25, 2020 at 04:46:43PM +0100, Jiri Olsa escreveu: On
> >Wed, Mar 25, 2020 at 07:48:39PM +0430, ahmadkhorrami wrote: Hi,
> >
> >Could you give me some hints about where the actual problem takes
> >place? Is
> >the problem with "Perf" or the hardware part (i.e., "Hardware
> >Performance
> >Counters")? Can I revise the problem by simply modifying the code?
> >How much
> >work is needed?
> >heya,
> >might be some callchain processing bug, but I can't reproduce it
> >on my setup..
> >would you have/make some simple example that would reproduce the issue?
> >
> >Another option is that you'd send perf.data together with 'perf
> >archive' data.
> >
> >Also.. we support 2 dwarf unwinders (libunwind/libdw).. not sure
> >which one you
> >have compiled in, but would be helpful to see if the other shows
> >the same.
> 
> perf -vv
> 
> +
> 
> ldd `which perf`
> 
> Output will help us find out which unwinder is being used, as well as
> the version of perf being used.
> 
> - Arnaldo


  reply index

Thread overview: 67+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <157597d74ff17f781d9de7e7e3defd13@ut.ac.ir>
2020-03-22 20:24 ` ahmadkhorrami
2020-03-23  0:34   ` Steven Rostedt
     [not found]     ` <21b3df4080709f193d62b159887e2a83@ut.ac.ir>
2020-03-23  8:49       ` Jiri Olsa
2020-03-23 10:03         ` ahmadkhorrami
2020-03-25 15:18           ` ahmadkhorrami
2020-03-25 15:46             ` Jiri Olsa
2020-03-25 18:54               ` ahmadkhorrami
2020-03-25 18:58               ` Arnaldo Carvalho de Melo
2020-03-25 19:10                 ` ahmadkhorrami
2020-03-25 19:28                   ` Arnaldo Carvalho de Melo [this message]
2020-03-25 20:01                     ` ahmadkhorrami
2020-03-25 20:39                       ` Jiri Olsa
2020-03-25 21:02                         ` Jiri Olsa
2020-03-25 21:09                           ` Steven Rostedt
2020-03-25 21:37                             ` ahmadkhorrami
2020-03-25 21:46                               ` Jiri Olsa
2020-03-25 22:21                                 ` ahmadkhorrami
2020-03-25 23:09                                   ` ahmadkhorrami
2020-03-26  9:59                                     ` Jiri Olsa
2020-03-26 13:20                                       ` ahmadkhorrami
2020-03-26 15:39                                         ` Jiri Olsa
2020-03-26 18:19                                           ` ahmadkhorrami
2020-03-26 18:21                                             ` ahmadkhorrami
2020-03-27  9:20                                             ` Jiri Olsa
2020-03-27 10:59                                               ` ahmadkhorrami
2020-03-27 11:04                                                 ` ahmadkhorrami
2020-03-27 12:10                                                   ` Milian Wolff
2020-03-27 12:58                                                     ` ahmadkhorrami
2020-03-27 13:25                                                       ` Milian Wolff
2020-03-27 13:33                                                         ` ahmadkhorrami
2020-03-27 18:43                                                   ` ahmadkhorrami
2020-03-27 22:37                                                     ` Jiri Olsa
2020-03-27 23:12                                                       ` ahmadkhorrami
2020-03-28 23:34                                                         ` Jiri Olsa
2020-03-29  0:43                                                           ` ahmadkhorrami
2020-03-29  1:16                                                             ` ahmadkhorrami
2020-03-29 11:19                                                               ` Jiri Olsa
2020-03-29 11:52                                                                 ` ahmadkhorrami
2020-03-29 12:08                                                                   ` Jiri Olsa
2020-03-29 12:39                                                                     ` ahmadkhorrami
2020-03-29 13:50                                                                       ` Milian Wolff
2020-03-29 14:23                                                                         ` ahmadkhorrami
2020-03-29 19:20                                                                         ` Jiri Olsa
2020-03-30  6:09                                                                           ` Milian Wolff
2020-03-30 13:07                                                                             ` Jiri Olsa
2020-03-30 13:49                                                                               ` ahmadkhorrami
2020-03-30 19:05                                                                                 ` ahmadkhorrami
2020-03-30 21:05                                                                                   ` debuginfod-based dwarf downloading, was " Frank Ch. Eigler
2020-03-31  9:26                                                                                     ` Jiri Olsa
2020-03-31 14:00                                                                                       ` Frank Ch. Eigler
2020-03-31  4:43                                                                                   ` ahmadkhorrami
2020-03-31  9:30                                                                                     ` Jiri Olsa
2020-03-31 11:53                                                                                       ` ahmadkhorrami
2020-03-31 12:43                                                                                   ` ahmadkhorrami
2020-03-31 13:20                                                                                     ` Jiri Olsa
2020-03-31 13:39                                                                                       ` ahmadkhorrami
2020-03-31 14:44                                                                                         ` Milian Wolff
2020-03-31 15:02                                                                                           ` ahmadkhorrami
2020-03-31 15:05                                                                                             ` ahmadkhorrami
2020-03-31 15:29                                                                                             ` Milian Wolff
2020-03-31 16:10                                                                                               ` Arnaldo Carvalho de Melo
2020-03-31 19:20                                                                                                 ` ahmadkhorrami
2020-03-31 19:17                                                                                               ` ahmadkhorrami
2020-03-31 20:57                                                                                               ` ahmadkhorrami
2020-04-04  1:01                                                                                                 ` ahmadkhorrami
2020-04-11 16:42                                                                                                   ` ahmadkhorrami
2020-04-11 21:04                                                                                                     ` ahmadkhorrami

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