perf c2c: Use 'peer' as default display for Arm64

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>
Reviewed-by: Ali Saidi <alisaidi@amazon.com>
Signed-off-by: Leo Yan <leo.yan@linaro.org>
Tested-by: Ali Saidi <alisaidi@amazon.com>
Acked-by: Ian Rogers <irogers@google.com>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Anshuman Khandual <anshuman.khandual@arm.com>
Cc: German Gomez <german.gomez@arm.com>
Cc: Gustavo A. R. Silva <gustavoars@kernel.org>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Clark <james.clark@arm.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: John Garry <john.garry@huawei.com>
Cc: Kajol Jain <kjain@linux.ibm.com>
Cc: Like Xu <likexu@tencent.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mike Leach <mike.leach@linaro.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Timothy Hayes <timothy.hayes@arm.com>
Cc: Will Deacon <will@kernel.org>
Cc: linux-arm-kernel@lists.infradead.org
Link: https://lore.kernel.org/r/20220811062451.435810-15-leo.yan@linaro.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

diff --git a/tools/perf/builtin-c2c.c b/tools/perf/builtin-c2c.c
index f7a961e..653e13b 100644 (file)
--- 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;
@@ -3068,27 +3068,39 @@ 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;
@@ -3096,7 +3108,7 @@ 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);