1. 19 7月, 2016 7 次提交
  2. 18 7月, 2016 2 次提交
  3. 17 7月, 2016 1 次提交
    • I
      Merge tag 'perf-core-for-mingo-20160715' of... · 09211e25
      Ingo Molnar 提交于
      Merge tag 'perf-core-for-mingo-20160715' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
      
      Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
      
      User visible changes:
      
       - Allow reading from a backward ring buffer (one setup via sys_perf_event_open()
         with perf_event_attr.write_backward = 1) (Wang Nan)
      
      Infrastructure changes:
      
       - Fix the build on Android NDK r12b (initially just for ARM), that is now port
         of my perf-build container collection and will get tested prior to sending
         patches upstream (Arnaldo Carvalho de Melo)
      
       - Add correct header for IPv6 definitions
      
       - Fix bitsperlong.h fallout (Arnaldo Carvalho de Melo, Peter Zijlstra)
      
       - Use base 0 (auto) in filename__read_ull(), so that we can handle hex values too (Jiri Olsa)
      Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: NIngo Molnar <mingo@kernel.org>
      09211e25
  4. 16 7月, 2016 19 次提交
  5. 15 7月, 2016 2 次提交
  6. 14 7月, 2016 9 次提交
    • A
      tools: Make "__always_inline" just "inline" on Android · 8c98abff
      Arnaldo Carvalho de Melo 提交于
      As the gcc there is producing tons of:
      
        "warning: always_inline function might not be inlinable"
      
      At least on android-ndk-r12/platforms/android-24/arch-arm, so, for the
      time being, use this big hammer.
      
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Chris Phlipot <cphlipot0@gmail.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-97l3eg3fnk5shmo4rsyyvj2t@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      8c98abff
    • A
      perf tools: Do not provide dup sched_getcpu() prototype on Android · 09dd39d2
      Arnaldo Carvalho de Melo 提交于
      The Bionic libc has this definition, so don't duplicate it.
      
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Chris Phlipot <cphlipot0@gmail.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-rmd19832zkt07e4crdzyen9z@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      09dd39d2
    • A
      tools lib traceevent: Add correct header for ipv6 definitions · ca575ad2
      Arnaldo Carvalho de Melo 提交于
      We need to include netinet/in.h to get the in6_addr struct definition, needed to
      build it on the Android NDK:
      
        In file included from event-parse.c:36:0:
        /home/acme/android/android-ndk-r12/platforms/android-24/arch-arm/usr/include/netinet/ip6.h:82:18: error: field 'ip6_src' has incomplete type
          struct in6_addr ip6_src; /* source address */
      
      And it is the canonical way of getting IPv6 definitions, as described,
      for instance, in Linux's 'man ipv6'
      
      Doing that uncovers another problem: this source file uses PRIu64 but
      doesn't include it, depending on it being included by chance via the now
      replaced header (netinet/ip6.h), fix it.
      
      Cc: Adrian Hunter <adrian.hunter@intel.com>
      Cc: Chris Phlipot <cphlipot0@gmail.com>
      Cc: David Ahern <dsahern@gmail.com>
      Cc: Jiri Olsa <jolsa@kernel.org>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Steven Rostedt <rostedt@goodmis.org>
      Cc: Wang Nan <wangnan0@huawei.com>
      Link: http://lkml.kernel.org/n/tip-tilr31n3yaba1whsd47qlwa3@git.kernel.orgSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      ca575ad2
    • I
      Merge tag 'perf-core-for-mingo-20160713' of... · b29c6574
      Ingo Molnar 提交于
      Merge tag 'perf-core-for-mingo-20160713' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/core
      
      Pull perf/core improvements and fixes from Arnaldo Carvalho de Melo:
      
      User visible changes:
      
      - Finish merging initial SDT (Statically Defined Traces) support, see
        cset comments for details about how it all works (Masami Hiramatsu)
      
      - Support attaching eBPF programs to tracepoints (Wang Nan)
      
      Infrastructure changes:
      
      - Fix up BITS_PER_LONG setting (Arnaldo Carvalho de Melo)
      
      - Add fallback from ELF_C_READ_MMAP to ELF_C_READ in objtool, fixing
        the build in libelf implementations lacking that elf_begin() cmd,
        such as Alpine Linux's (Arnaldo Carvalho de Melo)
      
      - Avoid checking code drift on busybox's diff in objtool (Arnaldo Carvalho de Melo)
      Signed-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Signed-off-by: NIngo Molnar <mingo@kernel.org>
      b29c6574
    • M
      perf test: Add a test case for SDT event · 8e5dc848
      Masami Hiramatsu 提交于
      Add a basic test case for SDT event support.  This test scans an SDT
      event in perftools and check whether the SDT event is correctly stored
      into the buildid cache.
      
      Here is an example:
      
        ----
        $ perf test sdt -v
        47: Test SDT event probing                                   :
        --- start ---
        test child forked, pid 20732
        Found 72 SDTs in /home/mhiramat/ksrc/linux/tools/perf/perf
        Writing cache: %sdt_perf:test_target=test_target
        Cache committed: 0
        symbol:test_target file:(null) line:0 offset:0 return:0 lazy:(null)
        test child finished with 0
        ---- end ----
        Test SDT event probing: Ok
        ----
      Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
      Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
      Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
      Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/146831796546.17065.1502584370844087537.stgit@devboxSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      8e5dc848
    • M
      perf build: Add sdt feature detection · e26e63be
      Masami Hiramatsu 提交于
      This checks whether sys/sdt.h is available or not, which is required for
      DTRACE_PROBE().
      
      We can disable this feature by passing NO_SDT=1 when building.
      
      This flag will be used for SDT test case and further SDT events in
      perftools.
      Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
      Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
      Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
      Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/146831795615.17065.17513820540591053933.stgit@devboxSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      e26e63be
    • M
      perf probe: Support a special SDT probe format · 7e9fca51
      Masami Hiramatsu 提交于
      Support a special SDT probe format which can omit the '%' prefix only if
      the SDT group name starts with "sdt_". So, for example both of
      "%sdt_libc:setjump" and "sdt_libc:setjump" are acceptable for perf probe
      --add.
      
      E.g. without this:
      
        # perf probe -a sdt_libc:setjmp
        Semantic error :There is non-digit char in line number.
        ...
      
      With this:
      
        # perf probe -a sdt_libc:setjmp
        Added new event:
          sdt_libc:setjmp      (on %setjmp in /usr/lib64/libc-2.20.so)
      
        You can now use it in all perf tools, such as:
      
        	perf record -e sdt_libc:setjmp -aR sleep 1
      Suggested-by: NBrendan Gregg <brendan.d.gregg@gmail.com>
      Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
      Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
      Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
      Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/146831794674.17065.13359473252168740430.stgit@devboxSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      7e9fca51
    • M
      perf probe: Support @BUILDID or @file suffix for SDT events · a598180a
      Masami Hiramatsu 提交于
      Support @BUILDID or @file suffix for SDT events. This allows perf to add
      probes on SDTs/pre-cached events on given FILE or the file which has
      given BUILDID (also, this complements BUILDID.)
      
      For example, both gcc and libstdc++ has same SDTs as below.  If you
      would like to add a probe on sdt_libstdcxx:catch on gcc, you can do as
      below.
      
        ----
        # perf list sdt | tail -n 6
          sdt_libstdcxx:catch@/usr/bin/gcc(0cc207fc4b27)     [SDT event]
          sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
          sdt_libstdcxx:rethrow@/usr/bin/gcc(0cc207fc4b27)   [SDT event]
          sdt_libstdcxx:rethrow@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
          sdt_libstdcxx:throw@/usr/bin/gcc(0cc207fc4b27)     [SDT event]
          sdt_libstdcxx:throw@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
        # perf probe -a %sdt_libstdcxx:catch@0cc
        Added new event:
          sdt_libstdcxx:catch  (on %catch in /usr/bin/gcc)
      
        You can now use it in all perf tools, such as:
      
        	perf record -e sdt_libstdcxx:catch -aR sleep 1
        ----
      
      Committer note:
      
      Doing the full sequence of steps to get the results above:
      
      With a clean build-id cache:
      
        [root@jouet ~]# rm -rf ~/.debug/
        [root@jouet ~]# perf list sdt
      
        List of pre-defined events (to be used in -e):
      
        [root@jouet ~]#
      
      No events whatsoever, then, we can add all events in gcc to the build-id
      cache, doing a --add + --dry-run:
      
        [root@jouet ~]# perf probe --dry-run --cache -x /usr/bin/gcc --add %sdt_libstdcxx:\*
        Added new events:
          sdt_libstdcxx:throw  (on %* in /usr/bin/gcc)
          sdt_libstdcxx:rethrow (on %* in /usr/bin/gcc)
          sdt_libstdcxx:catch  (on %* in /usr/bin/gcc)
      
        You can now use it in all perf tools, such as:
      
      	perf record -e sdt_libstdcxx:catch -aR sleep 1
      
        [root@jouet ~]#
      
      It really didn't add any events, it just cached them:
      
        [root@jouet ~]# perf probe -l
        [root@jouet ~]#
      
      We can see that it was cached as:
      
        [root@jouet ~]# ls -la ~/.debug/usr/bin/gcc/9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2/
        total 976
        drwxr-xr-x. 2 root root   4096 Jul 13 21:47 .
        drwxr-xr-x. 3 root root   4096 Jul 13 21:47 ..
        -rwxr-xr-x. 4 root root 985912 Jun 22 18:52 elf
        -rw-r--r--. 1 root root    303 Jul 13 21:47 probes
        [root@jouet ~]# file ~/.debug/usr/bin/gcc/9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2/elf
        /root/.debug/usr/bin/gcc/9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2/elf: ELF 64-bit LSB executable, x86-64, version 1 (SYSV), dynamically linked, interpreter /lib64/ld-linux-x86-64.so.2, for GNU/Linux 2.6.32, BuildID[sha1]=9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2, stripped
        [root@jouet ~]# cat ~/.debug/usr/bin/gcc/9a0730e2bcc6d2a2003d21ac46807e8ee6bcb7c2/probes
        %sdt_libstdcxx:throw=throw
        p:sdt_libstdcxx/throw /usr/bin/gcc:0x71ffd
        %sdt_libstdcxx:rethrow=rethrow
        p:sdt_libstdcxx/rethrow /usr/bin/gcc:0x720b8
        %sdt_libstdcxx:catch=catch
        p:sdt_libstdcxx/catch /usr/bin/gcc:0x7307f
        %sdt_libgcc:unwind=unwind
        p:sdt_libgcc/unwind /usr/bin/gcc:0x7eec0
        #sdt_libstdcxx:*=%*
        [root@jouet ~]#
      
      Ok, now we can use 'perf probe' to refer to those cached entries as:
      
        Humm, nope, doing as above we end up with:
      
        [root@jouet ~]# perf probe -a %sdt_libstdcxx:catch
        Semantic error :* is bad for event name -it must follow C symbol-naming rule.
          Error: Failed to add events.
        [root@jouet ~]#
      
      But it worked at some point, lets try not using --dry-run:
      
      Resetting everything:
      
        # rm -rf ~/.debug/
        # perf probe -d *:*
        # perf probe -l
        # perf list sdt
      
          List of pre-defined events (to be used in -e):
      
        #
      
      Ok, now it cached everything, even things we haven't asked it to
      (sdt_libgcc:unwind):
      
        [root@jouet ~]# perf probe -x /usr/bin/gcc --add %sdt_libstdcxx:\*
        Added new events:
          sdt_libstdcxx:throw  (on %* in /usr/bin/gcc)
          sdt_libstdcxx:rethrow (on %* in /usr/bin/gcc)
          sdt_libstdcxx:catch  (on %* in /usr/bin/gcc)
      
        You can now use it in all perf tools, such as:
      
      	perf record -e sdt_libstdcxx:catch -aR sleep 1
      
        [root@jouet ~]# perf list sdt
      
        List of pre-defined events (to be used in -e):
      
          sdt_libgcc:unwind                                  [SDT event]
          sdt_libstdcxx:catch                                [SDT event]
          sdt_libstdcxx:rethrow                              [SDT event]
          sdt_libstdcxx:throw                                [SDT event]
        [root@jouet ~]#
      
      And we have the events in place:
      
        [root@jouet ~]# perf probe -l
          sdt_libstdcxx:catch  (on execute_cfa_program+1551@../../../libgcc/unwind-dw2.c in /usr/bin/gcc)
          sdt_libstdcxx:rethrow (on d_print_subexpr+280@libsupc++/cp-demangle.c in /usr/bin/gcc)
          sdt_libstdcxx:throw  (on d_print_subexpr+93@libsupc++/cp-demangle.c in /usr/bin/gcc)
        [root@jouet ~]#
      
      And trying to use them at least has 'perf trace --event sdt*:*' working.
      
      Then, if we try to add the ones in libstdc++:
      
        [root@jouet ~]# perf probe -x /usr/lib64/libstdc++.so.6 -a %sdt_libstdcxx:\*
        Error: event "catch" already exists.
         Hint: Remove existing event by 'perf probe -d'
               or force duplicates by 'perf probe -f'
               or set 'force=yes' in BPF source.
          Error: Failed to add events.
        [root@jouet ~]#
      
      Doesn't work, dups, but at least this served to, unbeknownst to the user, add
      the SDT probes in /usr/lib64/libstdc++.so.6!
      
        [root@jouet ~]# perf list sdt
      
        List of pre-defined events (to be used in -e):
      
          sdt_libgcc:unwind                                  [SDT event]
          sdt_libstdcxx:catch@/usr/bin/gcc(9a0730e2bcc6)     [SDT event]
          sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event]
          sdt_libstdcxx:rethrow@/usr/bin/gcc(9a0730e2bcc6)   [SDT event]
          sdt_libstdcxx:rethrow@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event]
          sdt_libstdcxx:throw@/usr/bin/gcc(9a0730e2bcc6)     [SDT event]
          sdt_libstdcxx:throw@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event]
        [root@jouet ~]#
      
      Now we should be able to get to the original cset comment, if we remove all
      SDTs events in place, not from the cache, from the kernel, where it was set up as:
      
        [root@jouet ~]# ls -la /sys/kernel/debug/tracing/events/sdt_libstdcxx/
        total 0
        drwxr-xr-x.  5 root root 0 Jul 13 22:00 .
        drwxr-xr-x. 80 root root 0 Jul 13 21:56 ..
        drwxr-xr-x.  2 root root 0 Jul 13 22:00 catch
        -rw-r--r--.  1 root root 0 Jul 13 22:00 enable
        -rw-r--r--.  1 root root 0 Jul 13 22:00 filter
        drwxr-xr-x.  2 root root 0 Jul 13 22:00 rethrow
        drwxr-xr-x.  2 root root 0 Jul 13 22:00 throw
        [root@jouet ~]#
      
        [root@jouet ~]# head -2 /sys/kernel/debug/tracing/events/sdt_libstdcxx/throw/format
        name: throw
        ID: 2059
        [root@jouet ~]#
      
      Now to remove it:
      
        [root@jouet ~]# perf probe -d sdt_libstdc*:*
        Removed event: sdt_libstdcxx:catch
        Removed event: sdt_libstdcxx:rethrow
        Removed event: sdt_libstdcxx:throw
        [root@jouet ~]#
      
      Which caused:
      
        [root@jouet ~]# ls -la /sys/kernel/debug/tracing/events/sdt_libstdcxx/
        ls: cannot access '/sys/kernel/debug/tracing/events/sdt_libstdcxx/': No such file or directory
        [root@jouet ~]#
      
      Ok, now we can do:
      
        [root@jouet ~]# perf list sdt_libstdcxx:catch
      
        List of pre-defined events (to be used in -e):
      
          sdt_libstdcxx:catch@/usr/bin/gcc(9a0730e2bcc6)     [SDT event]
          sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event]
        [root@jouet ~]#
      
      So, these are not really 'pre-defined events', i.e. we can't use them with
      'perf record --event':
      
        [root@jouet ~]# perf record --event sdt_libstdcxx:catch*
        event syntax error: 'sdt_libstdcxx:catch*'
                             \___ unknown tracepoint
      
        Error:	File /sys/kernel/debug/tracing/events/sdt_libstdcxx/catch* not found.
        Hint:	Perhaps this kernel misses some CONFIG_ setting to enable this feature?.
      <SNIP>
        [root@jouet ~]#
      
      To have it really pre-defined we must use perf probe to get its definition from
      the cache and set it up in the kernel, creating the tracepoint to _then_ use it
      with 'perf record --event':
      
        [root@jouet ~]# perf probe -a sdt_libstdcxx:catch
        Semantic error :There is non-digit char in line number.
        <SNIP>
      
      Oops, there is another gotcha here, we need that pesky '%' character:
      
        [root@jouet ~]# perf probe -a %sdt_libstdcxx:catch
        Added new events:
          sdt_libstdcxx:catch  (on %catch in /usr/bin/gcc)
          sdt_libstdcxx:catch_1 (on %catch in /usr/lib64/libstdc++.so.6.0.22)
      
        You can now use it in all perf tools, such as:
      
      	perf record -e sdt_libstdcxx:catch_1 -aR sleep 1
      
        [root@jouet ~]#
      
      But then we added _two_ events, one with the name we expected, the other one
      with a _ added, when doing the analysis we need to pay attention to who maps to
      who.
      
      And here is where we get to the point of this patch, which is to be able to
      disambiguate those definitions for 'catch' in the build-id cache, but first we need
      remove those events we just added:
      
      [root@jouet ~]# perf probe -d %sdt_libstdcxx:catch
      
      Oops, that didn't remove anything, we need to _remove_ that % char in this case:
      
        [root@jouet ~]# perf probe -d sdt_libstdcxx:catch
        Removed event: sdt_libstdcxx:catch
      
      And we need to remove the other event added, i.e. I forgot to add a * at the end:
      
        [root@jouet ~]# perf probe -d sdt_libstdcxx:catch*
        Removed event: sdt_libstdcxx:catch_1
        [root@jouet ~]#
      
      Ok, disambiguating it using what is in this patch:
      
        [root@jouet ~]# perf list sdt_libstdcxx:catch
      
        List of pre-defined events (to be used in -e):
      
          sdt_libstdcxx:catch@/usr/bin/gcc(9a0730e2bcc6)     [SDT event]
          sdt_libstdcxx:catch@/usr/lib64/libstdc++.so.6.0.22(ef2b7066559a) [SDT event]
        [root@jouet ~]#
        [root@jouet ~]# perf probe -a %sdt_libstdcxx:catch@9a07
        Added new event:
          sdt_libstdcxx:catch  (on %catch in /usr/bin/gcc)
      
        You can now use it in all perf tools, such as:
      
      	perf record -e sdt_libstdcxx:catch -aR sleep 1
      
        [root@jouet ~]# perf probe -l
          sdt_libstdcxx:catch  (on execute_cfa_program+1551@../../../libgcc/unwind-dw2.c in /usr/bin/gcc)
        [root@jouet ~]#
      
      Yeah, it works! But we need to try and simplify this :-)
      
      Update: Some aspects of this simplification take place in the following
              patches.
      Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
      Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
      Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
      Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/146831793746.17065.13065062753978236612.stgit@devboxSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      a598180a
    • M
      perf list: Show SDT and pre-cached events · 40218dae
      Masami Hiramatsu 提交于
      Show SDT and pre-cached events by perf-list with "sdt". This also shows
      the binary and build-id where the events are placed only when there are
      same name events on different binaries.
      
      e.g.:
      
        # perf list sdt
      
        List of pre-defined events (to be used in -e):
      
          sdt_libc:lll_futex_wake                            [SDT event]
          sdt_libc:lll_lock_wait_private                     [SDT event]
          sdt_libc:longjmp                                   [SDT event]
          sdt_libc:longjmp_target                            [SDT event]
        ...
          sdt_libstdcxx:rethrow@/usr/bin/gcc(0cc207fc4b27)   [SDT event]
          sdt_libstdcxx:rethrow@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
          sdt_libstdcxx:throw@/usr/bin/gcc(0cc207fc4b27)     [SDT event]
          sdt_libstdcxx:throw@/usr/lib64/libstdc++.so.6.0.20(91c7a88fdf49)
      
      The binary path and build-id are shown in below format;
      
        <GROUP>:<EVENT>@<PATH>(<BUILD-ID>)
      Signed-off-by: NMasami Hiramatsu <mhiramat@kernel.org>
      Signed-off-by: NMasami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
      Tested-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
      Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
      Cc: Hemant Kumar <hemant@linux.vnet.ibm.com>
      Cc: Namhyung Kim <namhyung@kernel.org>
      Cc: Peter Zijlstra <peterz@infradead.org>
      Link: http://lkml.kernel.org/r/20160624090646.25421.44225.stgit@devboxSigned-off-by: NArnaldo Carvalho de Melo <acme@redhat.com>
      40218dae