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From:   Leo Yan <leo.yan@linaro.org>
To:     Arnaldo Carvalho de Melo <acme@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Ingo Molnar <mingo@redhat.com>,
        Mark Rutland <mark.rutland@arm.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Jiri Olsa <jolsa@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>, Alyssa Ross <hi@alyssa.is>,
        Ian Rogers <irogers@google.com>, Like Xu <likexu@tencent.com>,
        Kajol Jain <kjain@linux.ibm.com>,
        Li Huafei <lihuafei1@huawei.com>,
        Joe Mario <jmario@redhat.com>,
        Adam Li <adam.li@amperecomputing.com>,
        German Gomez <german.gomez@arm.com>,
        James Clark <james.clark@arm.com>,
        Ali Saidi <alisaidi@amazon.com>,
        linux-perf-users@vger.kernel.org, linux-kernel@vger.kernel.org
Cc:     Leo Yan <leo.yan@linaro.org>
Subject: [PATCH v4 11/12] perf c2c: Use 'peer' as default display for Arm64
Date:   Mon, 30 May 2022 19:40:35 +0800
Message-Id: <20220530114036.3225544-12-leo.yan@linaro.org>
In-Reply-To: <20220530114036.3225544-1-leo.yan@linaro.org>
References: <20220530114036.3225544-1-leo.yan@linaro.org>
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Since Arm64 arch doesn't support HITMs flags, this patch changes to use
'peer' as default display if user doesn't specify any type; for other
arches, it still uses 'tot' as default display type if user doesn't
specify it.

This patch changes to call perf_session__new() in an earlier place, so
session environment can be initialized ahead and arch info can be used
for setting display type.

Suggested-by: Ali Saidi <alisaidi@amazon.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
---
 tools/perf/builtin-c2c.c | 36 ++++++++++++++++++++++++------------
 1 file changed, 24 insertions(+), 12 deletions(-)

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index 1076bf8684d3..ccfd23103b96 100644
--- a/tools/perf/builtin-c2c.c
+++ b/tools/perf/builtin-c2c.c
@@ -2878,7 +2878,7 @@ static int setup_callchain(struct evlist *evlist)
 
 static int setup_display(const char *str)
 {
-	const char *display = str ?: "tot";
+	const char *display = str;
 
 	if (!strcmp(display, "tot"))
 		c2c.display = DISPLAY_TOT_HITM;
@@ -3066,27 +3066,39 @@ static int perf_c2c__report(int argc, const char **argv)
 	data.path  = input_name;
 	data.force = symbol_conf.force;
 
+	session = perf_session__new(&data, &c2c.tool);
+	if (IS_ERR(session)) {
+		err = PTR_ERR(session);
+		pr_debug("Error creating perf session\n");
+		goto out;
+	}
+
+	/*
+	 * Use the 'tot' as default display type if user doesn't specify it;
+	 * since Arm64 platform doesn't support HITMs flag, use 'peer' as the
+	 * default display type.
+	 */
+	if (!display) {
+		if (!strcmp(perf_env__arch(&session->header.env), "arm64"))
+			display = "peer";
+		else
+			display = "tot";
+	}
+
 	err = setup_display(display);
 	if (err)
-		goto out;
+		goto out_session;
 
 	err = setup_coalesce(coalesce, no_source);
 	if (err) {
 		pr_debug("Failed to initialize hists\n");
-		goto out;
+		goto out_session;
 	}
 
 	err = c2c_hists__init(&c2c.hists, "dcacheline", 2);
 	if (err) {
 		pr_debug("Failed to initialize hists\n");
-		goto out;
-	}
-
-	session = perf_session__new(&data, &c2c.tool);
-	if (IS_ERR(session)) {
-		err = PTR_ERR(session);
-		pr_debug("Error creating perf session\n");
-		goto out;
+		goto out_session;
 	}
 
 	session->itrace_synth_opts = &itrace_synth_opts;
@@ -3094,7 +3106,7 @@ static int perf_c2c__report(int argc, const char **argv)
 	err = setup_nodes(session);
 	if (err) {
 		pr_err("Failed setup nodes\n");
-		goto out;
+		goto out_session;
 	}
 
 	err = mem2node__init(&c2c.mem2node, &session->header.env);
-- 
2.25.1