linux-kernel - [tip:perf/core] perf cs-etm: Configure SWITCH

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Date:   Mon, 17 Jun 2019 12:21:34 -0700
From:   tip-bot for Mathieu Poirier <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     alexander.shishkin@...ux.intel.com, suzuki.poulose@....com,
        mingo@...nel.org, tglx@...utronix.de, linux-kernel@...r.kernel.org,
        namhyung@...nel.org, acme@...hat.com, peterz@...radead.org,
        jolsa@...hat.com, mathieu.poirier@...aro.org, leo.yan@...aro.org,
        hpa@...or.com
Subject: [tip:perf/core] perf cs-etm: Configure SWITCH_EVENTS in CPU-wide
 mode

Commit-ID:  e5993c42e8bb8dd90eb81a05fb58d5aa243325dd
Gitweb:     https://git.kernel.org/tip/e5993c42e8bb8dd90eb81a05fb58d5aa243325dd
Author:     Mathieu Poirier <mathieu.poirier@...aro.org>
AuthorDate: Fri, 24 May 2019 11:34:54 -0600
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 10 Jun 2019 15:50:01 -0300

perf cs-etm: 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>
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/20190524173508.29044-4-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 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) {