[PATCH v4 2/5] perf stat: Basic support for iostat in perf
From: Alexander Antonov
Date: Wed Feb 03 2021 - 09:01:36 EST
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@xxxxxxxxxxxxxxx>
---
tools/perf/builtin-stat.c | 31 ++++++++++++++++++++++++++
tools/perf/util/iostat.h | 32 +++++++++++++++++++++++++++
tools/perf/util/stat-display.c | 40 +++++++++++++++++++++++++++++++++-
tools/perf/util/stat-shadow.c | 11 +++++++++-
tools/perf/util/stat.h | 1 +
5 files changed, 113 insertions(+), 2 deletions(-)
create mode 100644 tools/perf/util/iostat.h
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 60fdb6a0805f..66c913692120 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -65,6 +65,7 @@
#include "util/target.h"
#include "util/time-utils.h"
#include "util/top.h"
+#include "util/iostat.h"
#include "asm/bug.h"
#include <linux/time64.h>
@@ -186,6 +187,7 @@ static struct perf_stat_config stat_config = {
.metric_only_len = METRIC_ONLY_LEN,
.walltime_nsecs_stats = &walltime_nsecs_stats,
.big_num = true,
+ .iostat_run = false,
};
static inline void diff_timespec(struct timespec *r, struct timespec *a,
@@ -723,6 +725,14 @@ static int parse_metric_groups(const struct option *opt,
return metricgroup__parse_groups(opt, str, &stat_config.metric_events);
}
+__weak int iostat_parse(const struct option *opt __maybe_unused,
+ const char *str __maybe_unused,
+ int unset __maybe_unused)
+{
+ pr_err("iostat mode is not supported\n");
+ return -1;
+}
+
static struct option stat_options[] = {
OPT_BOOLEAN('T', "transaction", &transaction_run,
"hardware transaction statistics"),
@@ -803,6 +813,8 @@ static struct option stat_options[] = {
OPT_CALLBACK('M', "metrics", &evsel_list, "metric/metric group list",
"monitor specified metrics or metric groups (separated by ,)",
parse_metric_groups),
+ OPT_CALLBACK_OPTARG(0, "iostat", &evsel_list, &stat_config, "root port",
+ "measure PCIe metrics per root port", iostat_parse),
OPT_END()
};
@@ -1131,6 +1143,12 @@ __weak void arch_topdown_group_warn(void)
{
}
+__weak int iostat_list(struct evlist *evlist __maybe_unused,
+ struct perf_stat_config *config __maybe_unused)
+{
+ return 0;
+}
+
/*
* Add default attributes, if there were no attributes specified or
* if -d/--detailed, -d -d or -d -d -d is used:
@@ -1682,6 +1700,10 @@ static void setup_system_wide(int forks)
}
}
+__weak void iostat_release(struct evlist *evlist __maybe_unused)
+{
+}
+
int cmd_stat(int argc, const char **argv)
{
const char * const stat_usage[] = {
@@ -1858,6 +1880,12 @@ int cmd_stat(int argc, const char **argv)
goto out;
}
+ if (stat_config.iostat_run) {
+ status = iostat_list(evsel_list, &stat_config);
+ if (status || !stat_config.iostat_run)
+ goto out;
+ }
+
if (add_default_attributes())
goto out;
@@ -2008,6 +2036,9 @@ int cmd_stat(int argc, const char **argv)
perf_stat__exit_aggr_mode();
perf_evlist__free_stats(evsel_list);
out:
+ if (stat_config.iostat_run)
+ iostat_release(evsel_list);
+
zfree(&stat_config.walltime_run);
if (smi_cost && smi_reset)
diff --git a/tools/perf/util/iostat.h b/tools/perf/util/iostat.h
new file mode 100644
index 000000000000..b34ebedfd5e6
--- /dev/null
+++ b/tools/perf/util/iostat.h
@@ -0,0 +1,32 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * perf iostat
+ *
+ * Copyright (C) 2020, Intel Corporation
+ *
+ * Authors: Alexander Antonov <alexander.antonov@xxxxxxxxxxxxxxx>
+ */
+
+#ifndef _IOSTAT_H
+#define _IOSTAT_H
+
+#include <subcmd/parse-options.h>
+#include "util/stat.h"
+#include "util/parse-events.h"
+#include "util/evlist.h"
+
+struct option;
+struct perf_stat_config;
+struct evlist;
+struct timespec;
+
+int iostat_parse(const struct option *opt, const char *str,
+ int unset __maybe_unused);
+void iostat_prefix(struct perf_stat_config *config, struct evlist *evlist,
+ char *prefix, struct timespec *ts);
+void iostat_print_metric(struct perf_stat_config *config, struct evsel *evsel,
+ struct perf_stat_output_ctx *out);
+int iostat_list(struct evlist *evlist, struct perf_stat_config *config);
+void iostat_release(struct evlist *evlist);
+
+#endif /* _IOSTAT_H */
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index db1bec115d0b..de78cf6962b9 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -16,6 +16,7 @@
#include <linux/ctype.h>
#include "cgroup.h"
#include <api/fs/fs.h>
+#include "iostat.h"
#define CNTR_NOT_SUPPORTED "<not supported>"
#define CNTR_NOT_COUNTED "<not counted>"
@@ -302,6 +303,11 @@ 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);
@@ -936,6 +942,8 @@ static void print_metric_headers(struct perf_stat_config *config,
fputs("time,", config->output);
fputs(aggr_header_csv[config->aggr_mode], config->output);
}
+ if (config->iostat_run && !config->interval && !config->csv_output)
+ fprintf(config->output, " port ");
/* Print metrics headers only */
evlist__for_each_entry(evlist, counter) {
@@ -954,6 +962,13 @@ static void print_metric_headers(struct perf_stat_config *config,
fputc('\n', config->output);
}
+__weak void iostat_prefix(struct perf_stat_config *config __maybe_unused,
+ struct evlist *evlist __maybe_unused,
+ char *prefix __maybe_unused,
+ struct timespec *ts __maybe_unused)
+{
+}
+
static void print_interval(struct perf_stat_config *config,
struct evlist *evlist,
char *prefix, struct timespec *ts)
@@ -966,7 +981,10 @@ static void print_interval(struct perf_stat_config *config,
if (config->interval_clear)
puts(CONSOLE_CLEAR);
- sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec, ts->tv_nsec, config->csv_sep);
+ if (!config->iostat_run)
+ sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec,
+ ts->tv_nsec,
+ config->csv_sep);
if ((num_print_interval == 0 && !config->csv_output) || config->interval_clear) {
switch (config->aggr_mode) {
@@ -996,6 +1014,7 @@ static void print_interval(struct perf_stat_config *config,
fprintf(output, " counts %*s events\n", unit_width, "unit");
break;
case AGGR_PCIE_PORT:
+ fprintf(output, "# time port ");
break;
case AGGR_GLOBAL:
default:
@@ -1174,6 +1193,10 @@ perf_evlist__print_counters(struct evlist *evlist,
int interval = config->interval;
struct evsel *counter;
char buf[64], *prefix = NULL;
+ void *perf_device = NULL;
+
+ if (config->iostat_run)
+ evlist->selected = evlist__first(evlist);
if (interval)
print_interval(config, evlist, prefix = buf, ts);
@@ -1222,6 +1245,21 @@ perf_evlist__print_counters(struct evlist *evlist,
}
break;
case AGGR_PCIE_PORT:
+ counter = evlist__first(evlist);
+ perf_evlist__set_selected(evlist, counter);
+ iostat_prefix(config, evlist, prefix = buf, ts);
+ fprintf(config->output, "%s", prefix);
+ evlist__for_each_entry(evlist, counter) {
+ perf_device = evlist->selected->priv;
+ if (perf_device && perf_device != counter->priv) {
+ perf_evlist__set_selected(evlist, counter);
+ iostat_prefix(config, evlist, prefix, ts);
+ fprintf(config->output, "\n%s", prefix);
+ }
+ print_counter_aggr(config, counter, prefix);
+ if ((counter->idx + 1) == evlist->core.nr_entries)
+ fputc('\n', config->output);
+ }
break;
case AGGR_UNSET:
default:
diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
index 2c41d47f6f83..083a450c6dc7 100644
--- a/tools/perf/util/stat-shadow.c
+++ b/tools/perf/util/stat-shadow.c
@@ -9,6 +9,7 @@
#include "expr.h"
#include "metricgroup.h"
#include <linux/zalloc.h>
+#include "iostat.h"
/*
* AGGR_GLOBAL: Use CPU 0
@@ -814,6 +815,12 @@ static void generic_metric(struct perf_stat_config *config,
zfree(&pctx.ids[i].name);
}
+__weak void iostat_print_metric(struct perf_stat_config *config __maybe_unused,
+ struct evsel *evsel __maybe_unused,
+ struct perf_stat_output_ctx *out __maybe_unused)
+{
+}
+
void perf_stat__print_shadow_stats(struct perf_stat_config *config,
struct evsel *evsel,
double avg, int cpu,
@@ -829,7 +836,9 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
struct metric_event *me;
int num = 1;
- if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
+ if (config->iostat_run) {
+ iostat_print_metric(config, evsel, out);
+ } else if (perf_evsel__match(evsel, HARDWARE, HW_INSTRUCTIONS)) {
total = runtime_stat_avg(st, STAT_CYCLES, ctx, cpu);
if (total) {
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index c7544c28c02a..c2a2b28effd6 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -107,6 +107,7 @@ struct perf_stat_config {
bool big_num;
bool no_merge;
bool walltime_run_table;
+ bool iostat_run;
FILE *output;
unsigned int interval;
unsigned int timeout;
--
2.19.1