perf script: Add option --show-switch-events

Add option --show-switch-events to show switch events in a similar
fashion to --show-task-events and --show-mmap-events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1437471846-26995-6-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
index c82df57..e2fec5f 100644 (file)
--- a/tools/perf/Documentation/perf-script.txt
+++ b/tools/perf/Documentation/perf-script.txt
@@ -222,6 +222,10 @@ OPTIONS
 --show-mmap-events
        Display mmap related events (e.g. MMAP, MMAP2).
 
+--show-switch-events
+       Display context switch events i.e. events of type PERF_RECORD_SWITCH or
+       PERF_RECORD_SWITCH_CPU_WIDE.
+
 --header
        Show perf.data header.
 

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 8a8e2ea..bd31380 100644 (file)
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -623,6 +623,7 @@ struct perf_script {
        struct perf_session     *session;
        bool                    show_task_events;
        bool                    show_mmap_events;
+       bool                    show_switch_events;
 };
 
 static int process_attr(struct perf_tool *tool, union perf_event *event,
@@ -813,6 +814,32 @@ static int process_mmap2_event(struct perf_tool *tool,
        return 0;
 }
 
+static int process_switch_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);
+
+       if (perf_event__process_switch(tool, event, sample, machine) < 0)
+               return -1;
+
+       thread = machine__findnew_thread(machine, sample->pid,
+                                        sample->tid);
+       if (thread == NULL) {
+               pr_debug("problem processing SWITCH event, skipping it.\n");
+               return -1;
+       }
+
+       print_sample_start(sample, thread, evsel);
+       perf_event__fprintf(event, stdout);
+       thread__put(thread);
+       return 0;
+}
+
 static void sig_handler(int sig __maybe_unused)
 {
        session_done = 1;
@@ -834,6 +861,8 @@ static int __cmd_script(struct perf_script *script)
                script->tool.mmap = process_mmap_event;
                script->tool.mmap2 = process_mmap2_event;
        }
+       if (script->show_switch_events)
+               script->tool.context_switch = process_switch_event;
 
        ret = perf_session__process_events(script->session);
 
@@ -1618,6 +1647,8 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
                    "Show the fork/comm/exit events"),
        OPT_BOOLEAN('\0', "show-mmap-events", &script.show_mmap_events,
                    "Show the mmap events"),
+       OPT_BOOLEAN('\0', "show-switch-events", &script.show_switch_events,
+                   "Show context switch events (if recorded)"),
        OPT_BOOLEAN('f', "force", &file.force, "don't complain, do it"),
        OPT_CALLBACK_OPTARG(0, "itrace", &itrace_synth_opts, NULL, "opts",
                            "Instruction Tracing options",