perf record: Add option --switch-events to select PERF_RECORD_SWITCH events

Add an option to select PERF_RECORD_SWITCH events.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Tested-by: Jiri Olsa <jolsa@redhat.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Pawel Moll <pawel.moll@arm.com>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/r/1437471846-26995-4-git-send-email-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/Documentation/perf-record.txt b/tools/perf/Documentation/perf-record.txt
index 29e5307..63ee040 100644 (file)
--- a/tools/perf/Documentation/perf-record.txt
+++ b/tools/perf/Documentation/perf-record.txt
@@ -293,6 +293,10 @@ 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 or
+PERF_RECORD_SWITCH_CPU_WIDE.
+
 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 1932e27..445a64d 100644 (file)
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1075,6 +1075,8 @@ 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()
 };
 
@@ -1102,6 +1104,11 @@ 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 937b16a..cf459f8 100644 (file)
--- 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 406a821..a8930b6 100644 (file)
--- 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 9e6e6f4..71f6905 100644 (file)
--- a/tools/perf/util/evsel.c
+++ b/tools/perf/util/evsel.c
@@ -738,6 +738,9 @@ 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 1f7becb..0d228a2 100644 (file)
--- 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;