linux-kernel - [tip:perf/core] perf cs-etm: Add handling of switch-CPU-wide events

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Date:   Mon, 17 Jun 2019 12:22:57 -0700
From:   tip-bot for Mathieu Poirier <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, peterz@...radead.org,
        tglx@...utronix.de, suzuki.poulose@....com, acme@...hat.com,
        hpa@...or.com, namhyung@...nel.org, mingo@...nel.org,
        mathieu.poirier@...aro.org, jolsa@...hat.com,
        alexander.shishkin@...ux.intel.com, leo.yan@...aro.org
Subject: [tip:perf/core] perf cs-etm: Add handling of switch-CPU-wide events

Commit-ID:  e0d170fa9a5c6dfc29fb8f900497d8c5ec29c6e7
Gitweb:     https://git.kernel.org/tip/e0d170fa9a5c6dfc29fb8f900497d8c5ec29c6e7
Author:     Mathieu Poirier <mathieu.poirier@...aro.org>
AuthorDate: Fri, 24 May 2019 11:34:56 -0600
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 10 Jun 2019 15:50:01 -0300

perf cs-etm: Add handling of switch-CPU-wide events

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@...aro.org>
Tested-by: Leo Yan <leo.yan@...aro.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Suzuki Poulouse <suzuki.poulose@....com>
Cc: coresight@...ts.linaro.org
Cc: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/20190524173508.29044-6-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/cs-etm.c | 38 ++++++++++++++++++++++++++++++++++++++
 1 file changed, 38 insertions(+)

diff --git a/tools/perf/util/cs-etm.c b/tools/perf/util/cs-etm.c
index 0742c50fce46..5322dcaaf654 100644
--- a/tools/perf/util/cs-etm.c
+++ b/tools/perf/util/cs-etm.c
@@ -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;
 }