linux-kernel - [PATCH v2 03/17] perf tools: Configure SWITCH

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Date:   Fri, 24 May 2019 11:34:54 -0600
From:   Mathieu Poirier <mathieu.poirier@...aro.org>
To:     acme@...nel.org
Cc:     peterz@...radead.org, mingo@...hat.com,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, suzuki.poulose@....com, leo.yan@...aro.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        coresight@...ts.linaro.org
Subject: [PATCH v2 03/17] perf tools: Configure SWITCH_EVENTS in CPU-wide mode

Ask the perf core to generate an event when processes are swapped in/out of
context.  That way proper action can be taken by the decoding code when
faced with such event.

Signed-off-by: Mathieu Poirier <mathieu.poirier@...aro.org>
---
 tools/perf/arch/arm/util/cs-etm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index be1e4f20affa..cc7f1cd23b14 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -257,6 +257,9 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
 	ptr->evlist = evlist;
 	ptr->snapshot_mode = opts->auxtrace_snapshot_mode;
 
+	if (perf_can_record_switch_events())
+		opts->record_switch_events = true;
+
 	evlist__for_each_entry(evlist, evsel) {
 		if (evsel->attr.type == cs_etm_pmu->type) {
 			if (cs_etm_evsel) {
-- 
2.17.1