perf tools: Add PERF_RECORD_NAMESPACES to include namespaces related info

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: Hari Bathini <hbathini@linux.vnet.ibm.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
Tested-by: Arnaldo 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.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 31 insertions, 1 deletions

diff --git a/tools/include/uapi/linux/perf_event.h b/tools/include/uapi/linux/perf_event.h
index c66a485a24ac..bec0aad0e15c 100644
--- a/tools/include/uapi/linux/perf_event.h
+++ b/tools/include/uapi/linux/perf_event.h
@@ -344,7 +344,8 @@ struct perf_event_attr {
                                 use_clockid    :  1, /* use @clockid for time fields */
                                 context_switch :  1, /* context switch data */
                                 write_backward :  1, /* Write ring buffer from end to beginning */
-                                __reserved_1   : 36;
+                                namespaces     :  1, /* include namespaces data */
+                                __reserved_1   : 35;
 
         union {
                 __u32           wakeup_events;    /* wakeup every n events */
@@ -610,6 +611,23 @@ struct perf_event_header {
         __u16   size;
 };
 
+struct perf_ns_link_info {
+        __u64   dev;
+        __u64   ino;
+};
+
+enum {
+        NET_NS_INDEX            = 0,
+        UTS_NS_INDEX            = 1,
+        IPC_NS_INDEX            = 2,
+        PID_NS_INDEX            = 3,
+        USER_NS_INDEX           = 4,
+        MNT_NS_INDEX            = 5,
+        CGROUP_NS_INDEX         = 6,
+
+        NR_NAMESPACES,          /* number of available namespaces */
+};
+
 enum perf_event_type {
 
         /*
@@ -862,6 +880,18 @@ enum perf_event_type {
          */
         PERF_RECORD_SWITCH_CPU_WIDE             = 15,
 
+        /*
+         * struct {
+         *      struct perf_event_header        header;
+         *      u32                             pid;
+         *      u32                             tid;
+         *      u64                             nr_namespaces;
+         *      { u64                           dev, inode; } [nr_namespaces];
+         *      struct sample_id                sample_id;
+         * };
+         */
+        PERF_RECORD_NAMESPACES                  = 16,
+
         PERF_RECORD_MAX,                        /* non-ABI */
 };