linux-kernel - [PATCH 1/1] perf: display raw event for mem report

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Date:   Tue, 16 Mar 2021 08:51:03 -0700
From:   Dan Schatzberg <schatzberg.dan@...il.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        linux-kernel@...r.kernel.org (open list:PERFORMANCE EVENTS SUBSYSTEM)
Subject: [PATCH 1/1] perf: display raw event for mem report

`perf mem record` can be used to capture memory loads/stores using
PEBS counters. `perf mem report -D` can be used to dump the raw
samples (e.g. each sampled memory access). However, it does not output
the raw event (load vs store).

This patch supplements the output of `perf mem report -D` with the
event name.

Signed-off-by: Dan Schatzberg <schatzberg.dan@...il.com>
---
 tools/perf/builtin-mem.c | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

diff --git a/tools/perf/builtin-mem.c b/tools/perf/builtin-mem.c
index cdd2b9f643f6..1f4ec350bca3 100644
--- a/tools/perf/builtin-mem.c
+++ b/tools/perf/builtin-mem.c
@@ -172,6 +172,7 @@ static int
 dump_raw_samples(struct perf_tool *tool,
 		 union perf_event *event,
 		 struct perf_sample *sample,
+		 struct evsel *evsel,
 		 struct machine *machine)
 {
 	struct perf_mem *mem = container_of(tool, struct perf_mem, tool);
@@ -220,6 +221,11 @@ dump_raw_samples(struct perf_tool *tool,
 			symbol_conf.field_sep);
 	}
 
+	if (evsel->name)
+		printf("%s%s", evsel->name, symbol_conf.field_sep);
+	else
+		printf("%s", symbol_conf.field_sep);
+
 	if (field_sep)
 		fmt = "%"PRIu64"%s0x%"PRIx64"%s%s:%s\n";
 	else
@@ -240,10 +246,10 @@ dump_raw_samples(struct perf_tool *tool,
 static int process_sample_event(struct perf_tool *tool,
 				union perf_event *event,
 				struct perf_sample *sample,
-				struct evsel *evsel __maybe_unused,
+				struct evsel *evsel,
 				struct machine *machine)
 {
-	return dump_raw_samples(tool, event, sample, machine);
+	return dump_raw_samples(tool, event, sample, evsel, machine);
 }
 
 static int report_raw_events(struct perf_mem *mem)
@@ -287,7 +293,7 @@ static int report_raw_events(struct perf_mem *mem)
 	if (mem->data_page_size)
 		printf("DATA PAGE SIZE, ");
 
-	printf("LOCAL WEIGHT, DSRC, SYMBOL\n");
+	printf("EVENT, LOCAL WEIGHT, DSRC, SYMBOL\n");
 
 	ret = perf_session__process_events(session);
 
-- 
2.30.2