Messages in this thread Patch in this message | | | From | Adrian Hunter <> | Subject | [PATCH V3 3/4] perf record: Add option --switch-events to select PERF_RECORD_SWITCH events | Date | Tue, 7 Jul 2015 11:36:41 +0300 |
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Add an option to select PERF_RECORD_SWITCH events.
Signed-off-by: Adrian Hunter <adrian.hunter@intel.com> --- tools/perf/Documentation/perf-record.txt | 3 +++ tools/perf/builtin-record.c | 7 +++++++ tools/perf/perf.h | 1 + tools/perf/util/evlist.h | 1 + tools/perf/util/evsel.c | 3 +++ tools/perf/util/record.c | 10 ++++++++++ 6 files changed, 25 insertions(+)
diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt index 9b9d9d086680..92d098c5123b 100644 --- a/tools/perf/Documentation/perf-record.txt +++ b/tools/perf/Documentation/perf-record.txt @@ -276,6 +276,9 @@ When processing pre-existing threads /proc/XXX/mmap, it may take a long time, because the file may be huge. A time out is needed in such cases. This option sets the time out limit. The default value is 500 ms. +--switch-events:: +Record context switch events i.e. events of type PERF_RECORD_SWITCH. + SEE ALSO -------- linkperf:perf-stat[1], linkperf:perf-list[1] diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c index 283fe96bdfc1..a20ad2191a92 100644 --- a/tools/perf/builtin-record.c +++ b/tools/perf/builtin-record.c @@ -1072,6 +1072,8 @@ struct option __record_options[] = { "opts", "AUX area tracing Snapshot Mode", ""), OPT_UINTEGER(0, "proc-map-timeout", &record.opts.proc_map_timeout, "per thread proc mmap processing timeout in ms"), + OPT_BOOLEAN(0, "switch-events", &record.opts.record_switch_events, + "Record context switch events"), OPT_END() }; @@ -1099,6 +1101,11 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused) " system-wide mode\n"); usage_with_options(record_usage, record_options); } + if (rec->opts.record_switch_events && + !perf_can_record_switch_events()) { + ui__error("kernel does not support recording context switch events (--switch-events option)\n"); + usage_with_options(record_usage, record_options); + } if (!rec->itr) { rec->itr = auxtrace_record__init(rec->evlist, &err); diff --git a/tools/perf/perf.h b/tools/perf/perf.h index 937b16aa0300..cf459f89fc9b 100644 --- a/tools/perf/perf.h +++ b/tools/perf/perf.h @@ -57,6 +57,7 @@ struct record_opts { bool running_time; bool full_auxtrace; bool auxtrace_snapshot_mode; + bool record_switch_events; unsigned int freq; unsigned int mmap_pages; unsigned int auxtrace_mmap_pages; diff --git a/tools/perf/util/evlist.h b/tools/perf/util/evlist.h index 037633c1da9d..c2fb15768d79 100644 --- a/tools/perf/util/evlist.h +++ b/tools/perf/util/evlist.h @@ -114,6 +114,7 @@ void perf_evlist__close(struct perf_evlist *evlist); void perf_evlist__set_id_pos(struct perf_evlist *evlist); bool perf_can_sample_identifier(void); +bool perf_can_record_switch_events(void); void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts); int record_opts__config(struct record_opts *opts); diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c index 67d2b43dd500..c63f96dba0d2 100644 --- a/tools/perf/util/evsel.c +++ b/tools/perf/util/evsel.c @@ -737,6 +737,9 @@ void perf_evsel__config(struct perf_evsel *evsel, struct record_opts *opts) attr->mmap2 = track && !perf_missing_features.mmap2; attr->comm = track; + if (opts->record_switch_events) + attr->context_switch = track; + if (opts->sample_transaction) perf_evsel__set_sample_bit(evsel, TRANSACTION); diff --git a/tools/perf/util/record.c b/tools/perf/util/record.c index 1f7becbe5e18..0d228a29526d 100644 --- a/tools/perf/util/record.c +++ b/tools/perf/util/record.c @@ -85,6 +85,11 @@ static void perf_probe_comm_exec(struct perf_evsel *evsel) evsel->attr.comm_exec = 1; } +static void perf_probe_context_switch(struct perf_evsel *evsel) +{ + evsel->attr.context_switch = 1; +} + bool perf_can_sample_identifier(void) { return perf_probe_api(perf_probe_sample_identifier); @@ -95,6 +100,11 @@ static bool perf_can_comm_exec(void) return perf_probe_api(perf_probe_comm_exec); } +bool perf_can_record_switch_events(void) +{ + return perf_probe_api(perf_probe_context_switch); +} + void perf_evlist__config(struct perf_evlist *evlist, struct record_opts *opts) { struct perf_evsel *evsel; -- 1.9.1
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