perf stat: Basic support for iostat in perf

Add basic flow for a new iostat mode in perf. Mode is intended to
provide four I/O performance metrics per each PCIe root port: Inbound Read,
Inbound Write, Outbound Read, Outbound Write.

The actual code to compute the metrics and attribute it to
root port is in follow-on patches.

Signed-off-by: Alexander Antonov <alexander.antonov@linux.intel.com>
Acked-by: Namhyung Kim <namhyung@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Alexey V Bayduraev <alexey.v.bayduraev@linux.intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210419094147.15909-2-alexander.antonov@linux.intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

1 files changed, 30 insertions, 10 deletions

diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index d3137bc17065..98664caef6af 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -17,6 +17,7 @@
 #include "cgroup.h"
 #include <api/fs/fs.h>
 #include "util.h"
+#include "iostat.h"
 
 #define CNTR_NOT_SUPPORTED	"<not supported>"
 #define CNTR_NOT_COUNTED	"<not counted>"
@@ -310,6 +311,11 @@ static void print_metric_header(struct perf_stat_config *config,
 	struct outstate *os = ctx;
 	char tbuf[1024];
 
+	/* In case of iostat, print metric header for first root port only */
+	if (config->iostat_run &&
+	    os->evsel->priv != os->evsel->evlist->selected->priv)
+		return;
+
 	if (!valid_only_metric(unit))
 		return;
 	unit = fixunit(tbuf, os->evsel, unit);
@@ -958,8 +964,11 @@ static void print_metric_headers(struct perf_stat_config *config,
 	if (config->csv_output) {
 		if (config->interval)
 			fputs("time,", config->output);
-		fputs(aggr_header_csv[config->aggr_mode], config->output);
+		if (!config->iostat_run)
+			fputs(aggr_header_csv[config->aggr_mode], config->output);
 	}
+	if (config->iostat_run)
+		iostat_print_header_prefix(config);
 
 	/* Print metrics headers only */
 	evlist__for_each_entry(evlist, counter) {
@@ -989,7 +998,8 @@ static void print_interval(struct perf_stat_config *config,
 	if (config->interval_clear)
 		puts(CONSOLE_CLEAR);
 
-	sprintf(prefix, "%6lu.%09lu%s", (unsigned long) ts->tv_sec, ts->tv_nsec, config->csv_sep);
+	if (!config->iostat_run)
+		sprintf(prefix, "%6lu.%09lu%s", (unsigned long) ts->tv_sec, ts->tv_nsec, config->csv_sep);
 
 	if ((num_print_interval == 0 && !config->csv_output) || config->interval_clear) {
 		switch (config->aggr_mode) {
@@ -1025,9 +1035,11 @@ static void print_interval(struct perf_stat_config *config,
 			break;
 		case AGGR_GLOBAL:
 		default:
-			fprintf(output, "#           time");
-			if (!metric_only)
-				fprintf(output, "             counts %*s events\n", unit_width, "unit");
+			if (!config->iostat_run) {
+				fprintf(output, "#           time");
+				if (!metric_only)
+					fprintf(output, "             counts %*s events\n", unit_width, "unit");
+			}
 		case AGGR_UNSET:
 			break;
 		}
@@ -1220,6 +1232,9 @@ void evlist__print_counters(struct evlist *evlist, struct perf_stat_config *conf
 	struct evsel *counter;
 	char buf[64], *prefix = NULL;
 
+	if (config->iostat_run)
+		evlist->selected = evlist__first(evlist);
+
 	if (interval)
 		print_interval(config, evlist, prefix = buf, ts);
 	else
@@ -1232,7 +1247,7 @@ void evlist__print_counters(struct evlist *evlist, struct perf_stat_config *conf
 			print_metric_headers(config, evlist, prefix, false);
 		if (num_print_iv++ == 25)
 			num_print_iv = 0;
-		if (config->aggr_mode == AGGR_GLOBAL && prefix)
+		if (config->aggr_mode == AGGR_GLOBAL && prefix && !config->iostat_run)
 			fprintf(config->output, "%s", prefix);
 	}
 
@@ -1249,11 +1264,16 @@ void evlist__print_counters(struct evlist *evlist, struct perf_stat_config *conf
 		}
 		break;
 	case AGGR_GLOBAL:
-		evlist__for_each_entry(evlist, counter) {
-			print_counter_aggr(config, counter, prefix);
+		if (config->iostat_run)
+			iostat_print_counters(evlist, config, ts, prefix = buf,
+					      print_counter_aggr);
+		else {
+			evlist__for_each_entry(evlist, counter) {
+				print_counter_aggr(config, counter, prefix);
+			}
+			if (metric_only)
+				fputc('\n', config->output);
 		}
-		if (metric_only)
-			fputc('\n', config->output);
 		break;
 	case AGGR_NONE:
 		if (metric_only)