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SubjectRe: [PATCH v2 5/5] perf evlist: Add -T/--trace option to show trace fields
Em Tue, Jan 05, 2016 at 07:58:38PM +0900, Namhyung Kim escreveu:
> To use dynamic sort keys, it might be good to add an option to see the
> list of field names.
>
> $ perf evlist -T -i perf.data.sched

Humm, I think here we should just use --trace_fields, like what appears
in the output for each line below, and also as is the case for the '-s
trace_fields' case, ok?

With:

$ . ~/git/linux/tools/perf/perf-completion.sh
[acme@zoo linux]$ perf evlist --
--force --freq --group --input --verbose
[acme@zoo linux]$ perf evlist --

We can autocomplete it from --t<TAB> anyway :)

Unsure about '-T', perhaps this is so specialized, that can remain with
just the long option?

Perhaps we can add a tip, when we run:

perf evlist

And there are tracepoint events, something like:

perf evlist -v
sched:sched_switch ...
# Tip use 'perf evlist --trace_fields' to show fields for events such
# as "sched:sched_switch"

- Arnaldo

> sched:sched_switch: trace_fields=prev_comm,prev_pid,prev_prio,prev_state,next_comm,next_pid,next_prio
> sched:sched_stat_wait: trace_fields=comm,pid,delay
> sched:sched_stat_sleep: trace_fields=comm,pid,delay
> sched:sched_stat_iowait: trace_fields=comm,pid,delay
> sched:sched_stat_runtime: trace_fields=comm,pid,runtime,vruntime
> sched:sched_process_fork: trace_fields=parent_comm,parent_pid,child_comm,child_pid
> sched:sched_wakeup: trace_fields=comm,pid,prio,success,target_cpu
> sched:sched_wakeup_new: trace_fields=comm,pid,prio,success,target_cpu
> sched:sched_migrate_task: trace_fields=comm,pid,prio,orig_cpu,dest_cpu
>
> Acked-by: Jiri Olsa <jolsa@kernel.org>
> Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> ---
> tools/perf/Documentation/perf-evlist.txt | 4 ++++
> tools/perf/builtin-evlist.c | 1 +
> tools/perf/util/evsel.c | 23 +++++++++++++++++++++++
> tools/perf/util/evsel.h | 1 +
> 4 files changed, 29 insertions(+)
>
> diff --git a/tools/perf/Documentation/perf-evlist.txt b/tools/perf/Documentation/perf-evlist.txt
> index 1ceb3700ffbb..b0d99c276cf5 100644
> --- a/tools/perf/Documentation/perf-evlist.txt
> +++ b/tools/perf/Documentation/perf-evlist.txt
> @@ -32,6 +32,10 @@ OPTIONS
> --group::
> Show event group information.
>
> +-T::
> +--trace::
> + Show tracepoint field names.
> +
> SEE ALSO
> --------
> linkperf:perf-record[1], linkperf:perf-list[1],
> diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
> index 08a7d36a2cf8..2820bb2d8cf8 100644
> --- a/tools/perf/builtin-evlist.c
> +++ b/tools/perf/builtin-evlist.c
> @@ -49,6 +49,7 @@ int cmd_evlist(int argc, const char **argv, const char *prefix __maybe_unused)
> OPT_BOOLEAN('g', "group", &details.event_group,
> "Show event group information"),
> OPT_BOOLEAN('f', "force", &details.force, "don't complain, do it"),
> + OPT_BOOLEAN('T', "trace", &details.trace, "Show tracepoint fields"),
> OPT_END()
> };
> const char * const evlist_usage[] = {
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 544e4400de13..174d0029e038 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -2298,6 +2298,29 @@ int perf_evsel__fprintf(struct perf_evsel *evsel,
> printed += comma_fprintf(fp, &first, " %s=%" PRIu64,
> term, (u64)evsel->attr.sample_freq);
> }
> +
> + if (details->trace) {
> + struct format_field *field;
> +
> + if (evsel->attr.type != PERF_TYPE_TRACEPOINT) {
> + printed += comma_fprintf(fp, &first, " (not a tracepoint)");
> + goto out;
> + }
> +
> + field = evsel->tp_format->format.fields;
> + if (field == NULL) {
> + printed += comma_fprintf(fp, &first, " (no trace field)");
> + goto out;
> + }
> +
> + printed += comma_fprintf(fp, &first, " trace_fields=%s", field->name);
> +
> + field = field->next;
> + while (field) {
> + printed += comma_fprintf(fp, &first, "%s", field->name);
> + field = field->next;
> + }
> + }
> out:
> fputc('\n', fp);
> return ++printed;
> diff --git a/tools/perf/util/evsel.h b/tools/perf/util/evsel.h
> index 5ded1fc0341e..9b36dd584d4a 100644
> --- a/tools/perf/util/evsel.h
> +++ b/tools/perf/util/evsel.h
> @@ -369,6 +369,7 @@ struct perf_attr_details {
> bool verbose;
> bool event_group;
> bool force;
> + bool trace;
> };
>
> int perf_evsel__fprintf(struct perf_evsel *evsel,
> --
> 2.6.4


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