• Hari Bathini's avatar
    perf tools: Add PERF_RECORD_NAMESPACES to include namespaces related info · f3b3614a
    Hari Bathini authored
    Introduce a new option to record PERF_RECORD_NAMESPACES events emitted
    by the kernel when fork, clone, setns or unshare are invoked. And update
    perf-record documentation with the new option to record namespace
    events.
    
    Committer notes:
    
    Combined it with a later patch to allow printing it via 'perf report -D'
    and be able to test the feature introduced in this patch. Had to move
    here also perf_ns__name(), that was introduced in another later patch.
    
    Also used PRIu64 and PRIx64 to fix the build in some enfironments wrt:
    
      util/event.c:1129:39: error: format '%lx' expects argument of type 'long unsigned int', but argument 6 has type 'long long unsigned int' [-Werror=format=]
         ret  += fprintf(fp, "%u/%s: %lu/0x%lx%s", idx
                                             ^
    Testing it:
    
      # perf record --namespaces -a
      ^C[ perf record: Woken up 1 times to write data ]
      [ perf record: Captured and wrote 1.083 MB perf.data (423 samples) ]
      #
      # perf report -D
      <SNIP>
      3 2028902078892 0x115140 [0xa0]: PERF_RECORD_NAMESPACES 14783/14783 - nr_namespaces: 7
                    [0/net: 3/0xf0000081, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc,
                     4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb]
    
      0x1151e0 [0x30]: event: 9
      .
      . ... raw event: size 48 bytes
      .  0000:  09 00 00 00 02 00 30 00 c4 71 82 68 0c 7f 00 00  ......0..q.h....
      .  0010:  a9 39 00 00 a9 39 00 00 94 28 fe 63 d8 01 00 00  .9...9...(.c....
      .  0020:  03 00 00 00 00 00 00 00 ce c4 02 00 00 00 00 00  ................
      <SNIP>
            NAMESPACES events:          1
      <SNIP>
      #
    Signed-off-by: default avatarHari Bathini <hbathini@linux.vnet.ibm.com>
    Acked-by: default avatarJiri Olsa <jolsa@kernel.org>
    Tested-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Alexei Starovoitov <ast@fb.com>
    Cc: Ananth N Mavinakayanahalli <ananth@linux.vnet.ibm.com>
    Cc: Aravinda Prasad <aravinda@linux.vnet.ibm.com>
    Cc: Brendan Gregg <brendan.d.gregg@gmail.com>
    Cc: Daniel Borkmann <daniel@iogearbox.net>
    Cc: Eric Biederman <ebiederm@xmission.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Sargun Dhillon <sargun@sargun.me>
    Cc: Steven Rostedt <rostedt@goodmis.org>
    Link: http://lkml.kernel.org/r/148891930386.25309.18412039920746995488.stgit@hbathini.in.ibm.comSigned-off-by: default avatarArnaldo Carvalho de Melo <acme@redhat.com>
    f3b3614a
namespaces.h 640 Bytes