Commit 96a44bbc authored Mar 08, 2017 by Hari Bathini Committed by Arnaldo Carvalho de Melo Mar 14, 2017

perf script: Add script print support for namespace events



Introduce a new option to display events of type PERF_RECORD_NAMESPACES
and update perf-script documentation accordingly.

Shown below is output (trimmed) of perf script command with the newly
introduced option, on perf.data generated with perf record command using
--namespaces option.

  $ perf script --show-namespace-events
      swapper   0 [000]     0.000000: PERF_RECORD_NAMESPACES 1/1 - nr_namespaces: 7
                [0/net: 3/0xf000001c, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc,
                 4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb]
      swapper   0 [000]     0.000000: PERF_RECORD_NAMESPACES 2/2 - nr_namespaces: 7
                [0/net: 3/0xf000001c, 1/uts: 3/0xeffffffe, 2/ipc: 3/0xefffffff, 3/pid: 3/0xeffffffc,
                 4/user: 3/0xeffffffd, 5/mnt: 3/0xf0000000, 6/cgroup: 3/0xeffffffb]

Commiter notes:

Testing it:

Investigating that double PERF_RECORD_NAMESPACES for the 19155
pid/tid... Its more than that, there are two PERF_RECORD_COMM as well,
and with zeroed timestamps, so probably a synthesizing artifact...

  # perf script --show-task --show-namespace
  <SNIP>
      perf     0 [000]     0.000000: PERF_RECORD_COMM: perf:19154/19154
      perf     0 [000]     0.000000: PERF_RECORD_FORK(19155:19155):(19154:19154)
      perf     0 [000]     0.000000: PERF_RECORD_NAMESPACES 19155/19155 - 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]
      perf     0 [000]     0.000000: PERF_RECORD_COMM: perf:19155/19155
      perf     0 [000]     0.000000: PERF_RECORD_COMM: perf:19155/19155
      perf     0 [000]     0.000000: PERF_RECORD_NAMESPACES 19155/19155 - 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]
   swapper     0 [000]  3110.881834:          1 cycles:  ffffffffa7060bf6 native_write_msr (/lib/modules/4.11.0-rc1+/build/vmlinux)

  <SNIP>

Signed-off-by: Hari Bathini <hbathini@linux.vnet.ibm.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Acked-by: Jiri Olsa <jolsa@kernel.org>
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/148891932627.25309.1941587059154176221.stgit@hbathini.in.ibm.com


Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

parent e907caf3

tools/perf/Documentation/perf-script.txt

+3 −0

Original line number	Diff line number	Diff line
		@@ -248,6 +248,9 @@ OPTIONS
		--show-mmap-events
		Display mmap related events (e.g. MMAP, MMAP2).

		--show-namespace-events
		Display namespace events i.e. events of type PERF_RECORD_NAMESPACES.

		--show-switch-events
		Display context switch events i.e. events of type PERF_RECORD_SWITCH or
		PERF_RECORD_SWITCH_CPU_WIDE.

tools/perf/builtin-script.c

+40 −0

Original line number	Diff line number	Diff line
		@@ -830,6 +830,7 @@ struct perf_script {
		bool show_task_events;
		bool show_mmap_events;
		bool show_switch_events;
		bool show_namespace_events;
		bool allocated;
		struct cpu_map *cpus;
		struct thread_map *threads;
		@@ -1118,6 +1119,41 @@ static int process_comm_event(struct perf_tool *tool,
		return ret;
		}

		static int process_namespaces_event(struct perf_tool *tool,
		union perf_event *event,
		struct perf_sample *sample,
		struct machine *machine)
		{
		struct thread *thread;
		struct perf_script *script = container_of(tool, struct perf_script, tool);
		struct perf_session *session = script->session;
		struct perf_evsel *evsel = perf_evlist__id2evsel(session->evlist, sample->id);
		int ret = -1;

		thread = machine__findnew_thread(machine, event->namespaces.pid,
		event->namespaces.tid);
		if (thread == NULL) {
		pr_debug("problem processing NAMESPACES event, skipping it.\n");
		return -1;
		}

		if (perf_event__process_namespaces(tool, event, sample, machine) < 0)
		goto out;

		if (!evsel->attr.sample_id_all) {
		sample->cpu = 0;
		sample->time = 0;
		sample->tid = event->namespaces.tid;
		sample->pid = event->namespaces.pid;
		}
		print_sample_start(sample, thread, evsel);
		perf_event__fprintf(event, stdout);
		ret = 0;
		out:
		thread__put(thread);
		return ret;
		}

		static int process_fork_event(struct perf_tool *tool,
		union perf_event *event,
		struct perf_sample *sample,
		@@ -1293,6 +1329,8 @@ static int __cmd_script(struct perf_script *script)
		}
		if (script->show_switch_events)
		script->tool.context_switch = process_switch_event;
		if (script->show_namespace_events)
		script->tool.namespaces = process_namespaces_event;

		ret = perf_session__process_events(script->session);

		@@ -2181,6 +2219,8 @@ int cmd_script(int argc, const char *argv, const char prefix __maybe_unused)
		"Show the mmap events"),
		OPT_BOOLEAN('\0', "show-switch-events", &script.show_switch_events,
		"Show context switch events (if recorded)"),
		OPT_BOOLEAN('\0', "show-namespace-events", &script.show_namespace_events,
		"Show namespace events (if recorded)"),
		OPT_BOOLEAN('f', "force", &symbol_conf.force, "don't complain, do it"),
		OPT_BOOLEAN(0, "ns", &nanosecs,
		"Use 9 decimal places when displaying time"),