@@ -1680,6 +1680,42 @@ static int cs_etm__process_itrace_start(struct cs_etm_auxtrace *etm,
return 0;
}
+static int cs_etm__process_switch_cpu_wide(struct cs_etm_auxtrace *etm,
+ union perf_event *event)
+{
+ struct thread *th;
+ bool out = event->header.misc & PERF_RECORD_MISC_SWITCH_OUT;
+
+ /*
+ * Context switch in per-thread mode are irrelevant since perf
+ * will start/stop tracing as the process is scheduled.
+ */
+ if (etm->timeless_decoding)
+ return 0;
+
+ /*
+ * SWITCH_IN events carry the next process to be switched out while
+ * SWITCH_OUT events carry the process to be switched in. As such
+ * we don't care about IN events.
+ */
+ if (!out)
+ return 0;
+
+ /*
+ * Add the tid/pid to the log so that we can get a match when
+ * we get a contextID from the decoder.
+ */
+ th = machine__findnew_thread(etm->machine,
+ event->context_switch.next_prev_pid,
+ event->context_switch.next_prev_tid);
+ if (!th)
+ return -ENOMEM;
+
+ thread__put(th);
+
+ return 0;
+}
+
static int cs_etm__process_event(struct perf_session *session,
union perf_event *event,
struct perf_sample *sample,
@@ -1719,6 +1755,8 @@ static int cs_etm__process_event(struct perf_session *session,
if (event->header.type == PERF_RECORD_ITRACE_START)
return cs_etm__process_itrace_start(etm, event);
+ else if (event->header.type == PERF_RECORD_SWITCH_CPU_WIDE)
+ return cs_etm__process_switch_cpu_wide(etm, event);
return 0;
}
Add handling of SWITCH-CPU-WIDE events in order to add the tid/pid of the incoming process to the perf tools machine infrastructure. This information is later retrieved when a contextID packet is found in the trace stream. Signed-off-by: Mathieu Poirier <mathieu.poirier@linaro.org> --- tools/perf/util/cs-etm.c | 38 ++++++++++++++++++++++++++++++++++++++ 1 file changed, 38 insertions(+)