linux-kernel - [tip:perf/core] perf: cs-etm: Optimize option setup for CPU-wide sessions

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Date:   Fri, 21 Jun 2019 23:35:11 -0700
From:   tip-bot for Mathieu Poirier <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     tglx@...utronix.de, mathieu.poirier@...aro.org, acme@...hat.com,
        hpa@...or.com, linux-kernel@...r.kernel.org,
        alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
        namhyung@...nel.org, suzuki.poulose@....com, mingo@...nel.org,
        peterz@...radead.org
Subject: [tip:perf/core] perf: cs-etm: Optimize option setup for CPU-wide
 sessions

Commit-ID:  374d910f87b87283df2b1e8a60a6a546d4a14c90
Gitweb:     https://git.kernel.org/tip/374d910f87b87283df2b1e8a60a6a546d4a14c90
Author:     Mathieu Poirier <mathieu.poirier@...aro.org>
AuthorDate: Tue, 11 Jun 2019 14:45:28 -0600
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Mon, 17 Jun 2019 15:57:16 -0300

perf: cs-etm: Optimize option setup for CPU-wide sessions

Call function cs_etm_set_option() once with all relevant options set
rather than multiple times to avoid going through the list of CPU more
than once.

Suggested-by: Suzuki K Poulose <suzuki.poulose@....com>
Signed-off-by: Mathieu Poirier <mathieu.poirier@...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: linux-arm-kernel@...ts.infradead.org
Link: http://lkml.kernel.org/r/20190611204528.20093-1-mathieu.poirier@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/arch/arm/util/cs-etm.c | 20 ++++++++------------
 1 file changed, 8 insertions(+), 12 deletions(-)

diff --git a/tools/perf/arch/arm/util/cs-etm.c b/tools/perf/arch/arm/util/cs-etm.c
index 279c69caef91..c6f1ab5499b5 100644
--- a/tools/perf/arch/arm/util/cs-etm.c
+++ b/tools/perf/arch/arm/util/cs-etm.c
@@ -162,20 +162,19 @@ static int cs_etm_set_option(struct auxtrace_record *itr,
 		    !cpu_map__has(online_cpus, i))
 			continue;
 
-		switch (option) {
-		case ETM_OPT_CTXTID:
+		if (option & ETM_OPT_CTXTID) {
 			err = cs_etm_set_context_id(itr, evsel, i);
 			if (err)
 				goto out;
-			break;
-		case ETM_OPT_TS:
+		}
+		if (option & ETM_OPT_TS) {
 			err = cs_etm_set_timestamp(itr, evsel, i);
 			if (err)
 				goto out;
-			break;
-		default:
-			goto out;
 		}
+		if (option & ~(ETM_OPT_CTXTID | ETM_OPT_TS))
+			/* Nothing else is currently supported */
+			goto out;
 	}
 
 	err = 0;
@@ -398,11 +397,8 @@ static int cs_etm_recording_options(struct auxtrace_record *itr,
 	if (!cpu_map__empty(cpus)) {
 		perf_evsel__set_sample_bit(cs_etm_evsel, CPU);
 
-		err = cs_etm_set_option(itr, cs_etm_evsel, ETM_OPT_CTXTID);
-		if (err)
-			goto out;
-
-		err = cs_etm_set_option(itr, cs_etm_evsel, ETM_OPT_TS);
+		err = cs_etm_set_option(itr, cs_etm_evsel,
+					ETM_OPT_CTXTID | ETM_OPT_TS);
 		if (err)
 			goto out;
 	}