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    Subject[PATCH V3 4/4] perf script: Add option --show-switch-events
    Date
    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>
    ---
    tools/perf/Documentation/perf-script.txt | 3 +++
    tools/perf/builtin-script.c | 31 +++++++++++++++++++++++++++++++
    2 files changed, 34 insertions(+)

    diff --git a/tools/perf/Documentation/perf-script.txt b/tools/perf/Documentation/perf-script.txt
    index c82df572fac2..beca47ae9dbf 100644
    --- a/tools/perf/Documentation/perf-script.txt
    +++ b/tools/perf/Documentation/perf-script.txt
    @@ -222,6 +222,9 @@ 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.
    +
    --header
    Show perf.data header.

    diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
    index 24809787369f..b3a00c93bfa1 100644
    --- 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__first(session->evlist);
    +
    + 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",
    --
    1.9.1


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