* [PATCH v3 0/3] JSON output for perf stat
@ 2022-05-17 21:59 Ian Rogers
2022-05-17 21:59 ` [PATCH v3 1/3] perf test: Add checking for perf stat CSV output Ian Rogers
` (2 more replies)
0 siblings, 3 replies; 4+ messages in thread
From: Ian Rogers @ 2022-05-17 21:59 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Kan Liang, Zhengjun Xing, Sandipan Das, Claire Jensen,
Alyssa Ross, Like Xu, James Clark, Florian Fischer, linux-kernel,
linux-perf-users, Claire Jensen
Cc: Stephane Eranian, Ian Rogers
Parsing the CSV or text output of perf stat can be problematic when
new output is added (columns in CSV format). JSON names values and
simplifies the job of parsing. Add a JSON output option to perf-stat
then add unit test that parses and validates the output.
This is a resend of two v2 patches:
https://lore.kernel.org/lkml/20210813220754.2104922-1-cjense@google.com/
https://lore.kernel.org/lkml/20210813220936.2105426-1-cjense@google.com/
with a few formatting changes and improvements to the linter.
The CSV test/linter is also added to ensure that CSV output doesn't regress:
https://lore.kernel.org/lkml/20210813192108.2087512-1-cjense@google.com/
v3. There is some tidy up of CSV code including a potential memory
over run in the os.nfields set up caught by sanitizers. To
facilitate this an AGGR_MAX value is added. v3 also adds the CSV
testing.
v2. Fixes the system wide no aggregation test to not run if the
paranoia is wrong. It also makes the counter-value check handle
the "<not counted>" and "<not supported>" cases.
Claire Jensen (3):
perf test: Add checking for perf stat CSV output.
perf stat: Add JSON output option
perf test: Json format checking
tools/perf/Documentation/perf-stat.txt | 21 +
tools/perf/builtin-stat.c | 6 +
.../tests/shell/lib/perf_csv_output_lint.py | 48 +++
.../tests/shell/lib/perf_json_output_lint.py | 91 +++++
tools/perf/tests/shell/stat+csv_output.sh | 147 +++++++
tools/perf/tests/shell/stat+json_output.sh | 147 +++++++
tools/perf/util/stat-display.c | 384 +++++++++++++-----
tools/perf/util/stat.c | 1 +
tools/perf/util/stat.h | 2 +
9 files changed, 741 insertions(+), 106 deletions(-)
create mode 100644 tools/perf/tests/shell/lib/perf_csv_output_lint.py
create mode 100644 tools/perf/tests/shell/lib/perf_json_output_lint.py
create mode 100755 tools/perf/tests/shell/stat+csv_output.sh
create mode 100755 tools/perf/tests/shell/stat+json_output.sh
--
2.36.0.550.gb090851708-goog
^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH v3 1/3] perf test: Add checking for perf stat CSV output.
2022-05-17 21:59 [PATCH v3 0/3] JSON output for perf stat Ian Rogers
@ 2022-05-17 21:59 ` Ian Rogers
2022-05-17 21:59 ` [PATCH v3 2/3] perf stat: Add JSON output option Ian Rogers
2022-05-17 21:59 ` [PATCH v3 3/3] perf test: Json format checking Ian Rogers
2 siblings, 0 replies; 4+ messages in thread
From: Ian Rogers @ 2022-05-17 21:59 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Kan Liang, Zhengjun Xing, Sandipan Das, Claire Jensen,
Alyssa Ross, Like Xu, James Clark, Florian Fischer, linux-kernel,
linux-perf-users, Claire Jensen
Cc: Stephane Eranian, Ian Rogers
From: Claire Jensen <cjense@google.com>
Counts expected fields for various commands. No testing added for
summary mode since it is broken.
An example of the summary output is:
summary,263831,,instructions:u,1435072,100.0,0.46,insn per cycle
,,,,,1.37,stalled cycles per insn
This should be:
summary,263831,,instructions:u,1435072,100.0,0.46,insn per cycle
summary,,,,,,1.37,stalled cycles per insn
The output has 7 fields when it should have 8. Additionally, the newline
spacing is wrong, so it was excluded from testing until a fix is made.
Signed-off-by: Claire Jensen <cjense@google.com>
Signed-off-by: Ian Rogers <irogers@google.com>
---
.../tests/shell/lib/perf_csv_output_lint.py | 48 ++++++
tools/perf/tests/shell/stat+csv_output.sh | 147 ++++++++++++++++++
2 files changed, 195 insertions(+)
create mode 100644 tools/perf/tests/shell/lib/perf_csv_output_lint.py
create mode 100755 tools/perf/tests/shell/stat+csv_output.sh
diff --git a/tools/perf/tests/shell/lib/perf_csv_output_lint.py b/tools/perf/tests/shell/lib/perf_csv_output_lint.py
new file mode 100644
index 000000000000..714f283cfb1b
--- /dev/null
+++ b/tools/perf/tests/shell/lib/perf_csv_output_lint.py
@@ -0,0 +1,48 @@
+#!/usr/bin/python
+# SPDX-License-Identifier: GPL-2.0
+
+import argparse
+import sys
+
+# Basic sanity check of perf CSV output as specified in the man page.
+# Currently just checks the number of fields per line in output.
+
+ap = argparse.ArgumentParser()
+ap.add_argument('--no-args', action='store_true')
+ap.add_argument('--interval', action='store_true')
+ap.add_argument('--system-wide-no-aggr', action='store_true')
+ap.add_argument('--system-wide', action='store_true')
+ap.add_argument('--event', action='store_true')
+ap.add_argument('--per-core', action='store_true')
+ap.add_argument('--per-thread', action='store_true')
+ap.add_argument('--per-die', action='store_true')
+ap.add_argument('--per-node', action='store_true')
+ap.add_argument('--per-socket', action='store_true')
+ap.add_argument('--separator', default=',', nargs='?')
+args = ap.parse_args()
+
+Lines = sys.stdin.readlines()
+
+def check_csv_output(exp):
+ for line in Lines:
+ if 'failed' not in line:
+ count = line.count(args.separator)
+ if count != exp:
+ sys.stdout.write(''.join(Lines))
+ raise RuntimeError(f'wrong number of fields. expected {exp} in {line}')
+
+try:
+ if args.no_args or args.system_wide or args.event:
+ expected_items = 6
+ elif args.interval or args.per_thread or args.system_wide_no_aggr:
+ expected_items = 7
+ elif args.per_core or args.per_socket or args.per_node or args.per_die:
+ expected_items = 8
+ else:
+ ap.print_help()
+ raise RuntimeError('No checking option specified')
+ check_csv_output(expected_items)
+
+except:
+ sys.stdout.write('Test failed for input: ' + ''.join(Lines))
+ raise
diff --git a/tools/perf/tests/shell/stat+csv_output.sh b/tools/perf/tests/shell/stat+csv_output.sh
new file mode 100755
index 000000000000..82c25e9c7f21
--- /dev/null
+++ b/tools/perf/tests/shell/stat+csv_output.sh
@@ -0,0 +1,147 @@
+#!/bin/bash
+# perf stat CSV output linter
+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+# Tests various perf stat CSV output commands for the
+# correct number of fields and the CSV separator set to ','.
+
+set -e
+
+pythonchecker=$(dirname $0)/lib/perf_csv_output_lint.py
+if [ "x$PYTHON" == "x" ]
+then
+ if which python3 > /dev/null
+ then
+ PYTHON=python3
+ elif which python > /dev/null
+ then
+ PYTHON=python
+ else
+ echo Skipping test, python not detected please set environment variable PYTHON.
+ exit 2
+ fi
+fi
+
+# Return true if perf_event_paranoid is > $1 and not running as root.
+function ParanoidAndNotRoot()
+{
+ [ $(id -u) != 0 ] && [ $(cat /proc/sys/kernel/perf_event_paranoid) -gt $1 ]
+}
+
+check_no_args()
+{
+ echo -n "Checking CSV output: no args "
+ perf stat -x, true 2>&1 | $PYTHON $pythonchecker --no-args
+ echo "[Success]"
+}
+
+check_system_wide()
+{
+ echo -n "Checking CSV output: system wide "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -x, -a true 2>&1 | $PYTHON $pythonchecker --system-wide
+ echo "[Success]"
+}
+
+check_system_wide_no_aggr()
+{
+ echo -n "Checking CSV output: system wide "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ echo -n "Checking CSV output: system wide no aggregation "
+ perf stat -x, -A -a --no-merge true 2>&1 | $PYTHON $pythonchecker --system-wide-no-aggr
+ echo "[Success]"
+}
+
+check_interval()
+{
+ echo -n "Checking CSV output: interval "
+ perf stat -x, -I 1000 true 2>&1 | $PYTHON $pythonchecker --interval
+ echo "[Success]"
+}
+
+
+check_event()
+{
+ echo -n "Checking CSV output: event "
+ perf stat -x, -e cpu-clock true 2>&1 | $PYTHON $pythonchecker --event
+ echo "[Success]"
+}
+
+check_per_core()
+{
+ echo -n "Checking CSV output: per core "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -x, --per-core -a true 2>&1 | $PYTHON $pythonchecker --per-core
+ echo "[Success]"
+}
+
+check_per_thread()
+{
+ echo -n "Checking CSV output: per thread "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -x, --per-thread -a true 2>&1 | $PYTHON $pythonchecker --per-thread
+ echo "[Success]"
+}
+
+check_per_die()
+{
+ echo -n "Checking CSV output: per die "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -x, --per-die -a true 2>&1 | $PYTHON $pythonchecker --per-die
+ echo "[Success]"
+}
+
+check_per_node()
+{
+ echo -n "Checking CSV output: per node "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -x, --per-node -a true 2>&1 | $PYTHON $pythonchecker --per-node
+ echo "[Success]"
+}
+
+check_per_socket()
+{
+ echo -n "Checking CSV output: per socket "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -x, --per-socket -a true 2>&1 | $PYTHON $pythonchecker --per-socket
+ echo "[Success]"
+}
+
+check_no_args
+check_system_wide
+check_system_wide_no_aggr
+check_interval
+check_event
+check_per_core
+check_per_thread
+check_per_die
+check_per_node
+check_per_socket
+exit 0
--
2.36.0.550.gb090851708-goog
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v3 2/3] perf stat: Add JSON output option
2022-05-17 21:59 [PATCH v3 0/3] JSON output for perf stat Ian Rogers
2022-05-17 21:59 ` [PATCH v3 1/3] perf test: Add checking for perf stat CSV output Ian Rogers
@ 2022-05-17 21:59 ` Ian Rogers
2022-05-17 21:59 ` [PATCH v3 3/3] perf test: Json format checking Ian Rogers
2 siblings, 0 replies; 4+ messages in thread
From: Ian Rogers @ 2022-05-17 21:59 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Kan Liang, Zhengjun Xing, Sandipan Das, Claire Jensen,
Alyssa Ross, Like Xu, James Clark, Florian Fischer, linux-kernel,
linux-perf-users, Claire Jensen
Cc: Stephane Eranian, Ian Rogers
From: Claire Jensen <cjense@google.com>
CSV output is tricky to format and column layout changes are susceptible
to breaking parsers. New JSON-formatted output has variable names to
identify fields that are consistent and informative, making
the output parseable.
CSV output example:
1.20,msec,task-clock:u,1204272,100.00,0.697,CPUs utilized
0,,context-switches:u,1204272,100.00,0.000,/sec
0,,cpu-migrations:u,1204272,100.00,0.000,/sec
70,,page-faults:u,1204272,100.00,58.126,K/sec
JSON output example:
{"counter-value" : "3805.723968", "unit" : "msec", "event" :
"cpu-clock", "event-runtime" : 3805731510100.00, "pcnt-running"
: 100.00, "metric-value" : 4.007571, "metric-unit" : "CPUs utilized"}
{"counter-value" : "6166.000000", "unit" : "", "event" :
"context-switches", "event-runtime" : 3805723045100.00, "pcnt-running"
: 100.00, "metric-value" : 1.620191, "metric-unit" : "K/sec"}
{"counter-value" : "466.000000", "unit" : "", "event" :
"cpu-migrations", "event-runtime" : 3805727613100.00, "pcnt-running"
: 100.00, "metric-value" : 122.447136, "metric-unit" : "/sec"}
{"counter-value" : "208.000000", "unit" : "", "event" :
"page-faults", "event-runtime" : 3805726799100.00, "pcnt-running"
: 100.00, "metric-value" : 54.654516, "metric-unit" : "/sec"}
Also added documentation for JSON option.
There is some tidy up of CSV code including a potential memory over run
in the os.nfields set up. To facilitate this an AGGR_MAX value is added.
Signed-off-by: Claire Jensen <cjense@google.com>
Signed-off-by: Ian Rogers <irogers@google.com>
---
tools/perf/Documentation/perf-stat.txt | 21 ++
tools/perf/builtin-stat.c | 6 +
tools/perf/util/stat-display.c | 384 ++++++++++++++++++-------
tools/perf/util/stat.c | 1 +
tools/perf/util/stat.h | 2 +
5 files changed, 308 insertions(+), 106 deletions(-)
diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
index 8d1cde00b8d6..f9cdfd912b05 100644
--- a/tools/perf/Documentation/perf-stat.txt
+++ b/tools/perf/Documentation/perf-stat.txt
@@ -570,6 +570,27 @@ Additional metrics may be printed with all earlier fields being empty.
include::intel-hybrid.txt[]
+JSON FORMAT
+-----------
+
+With -j, perf stat is able to print out a JSON format output
+that can be used for parsing.
+
+- timestamp : optional usec time stamp in fractions of second (with -I)
+- optional aggregate options:
+ - core : core identifier (with --per-core)
+ - die : die identifier (with --per-die)
+ - socket : socket identifier (with --per-socket)
+ - node : node identifier (with --per-node)
+ - thread : thread identifier (with --per-thread)
+- counter-value : counter value
+- unit : unit of the counter value or empty
+- event : event name
+- variance : optional variance if multiple values are collected (with -r)
+- runtime : run time of counter
+- metric-value : optional metric value
+- metric-unit : optional unit of metric
+
SEE ALSO
--------
linkperf:perf-top[1], linkperf:perf-list[1]
diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
index 1b96636df01e..47f2d4d87b88 100644
--- a/tools/perf/builtin-stat.c
+++ b/tools/perf/builtin-stat.c
@@ -1262,6 +1262,8 @@ static struct option stat_options[] = {
"Merge identical named hybrid events"),
OPT_STRING('x', "field-separator", &stat_config.csv_sep, "separator",
"print counts with custom separator"),
+ OPT_BOOLEAN('j', "json-output", &stat_config.json_output,
+ "print counts in JSON format"),
OPT_CALLBACK('G', "cgroup", &evsel_list, "name",
"monitor event in cgroup name only", parse_stat_cgroups),
OPT_STRING(0, "for-each-cgroup", &stat_config.cgroup_list, "name",
@@ -1448,6 +1450,7 @@ static aggr_cpu_id_get_t aggr_mode__get_aggr(enum aggr_mode aggr_mode)
case AGGR_GLOBAL:
case AGGR_THREAD:
case AGGR_UNSET:
+ case AGGR_MAX:
default:
return NULL;
}
@@ -1472,6 +1475,7 @@ static aggr_get_id_t aggr_mode__get_id(enum aggr_mode aggr_mode)
case AGGR_GLOBAL:
case AGGR_THREAD:
case AGGR_UNSET:
+ case AGGR_MAX:
default:
return NULL;
}
@@ -1622,6 +1626,7 @@ static aggr_cpu_id_get_t aggr_mode__get_aggr_file(enum aggr_mode aggr_mode)
case AGGR_GLOBAL:
case AGGR_THREAD:
case AGGR_UNSET:
+ case AGGR_MAX:
default:
return NULL;
}
@@ -1642,6 +1647,7 @@ static aggr_get_id_t aggr_mode__get_id_file(enum aggr_mode aggr_mode)
case AGGR_GLOBAL:
case AGGR_THREAD:
case AGGR_UNSET:
+ case AGGR_MAX:
default:
return NULL;
}
diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c
index 98669ca5a86b..a14014e9f940 100644
--- a/tools/perf/util/stat-display.c
+++ b/tools/perf/util/stat-display.c
@@ -28,15 +28,21 @@
static void print_running(struct perf_stat_config *config,
u64 run, u64 ena)
{
- if (config->csv_output) {
- fprintf(config->output, "%s%" PRIu64 "%s%.2f",
- config->csv_sep,
- run,
- config->csv_sep,
- ena ? 100.0 * run / ena : 100.0);
- } else if (run != ena) {
+
+ double enabled_percent = 100;
+
+ if (run != ena)
+ enabled_percent = 100 * run / ena;
+ if (config->json_output)
+ fprintf(config->output,
+ "\"event-runtime\" : %lu, \"pcnt-running\" : %.2f, ",
+ run, enabled_percent);
+ else if (config->csv_output)
+ fprintf(config->output,
+ "%s%" PRIu64 "%s%.2f", config->csv_sep,
+ run, config->csv_sep, enabled_percent);
+ else if (run != ena)
fprintf(config->output, " (%.2f%%)", 100.0 * run / ena);
- }
}
static void print_noise_pct(struct perf_stat_config *config,
@@ -44,7 +50,9 @@ static void print_noise_pct(struct perf_stat_config *config,
{
double pct = rel_stddev_stats(total, avg);
- if (config->csv_output)
+ if (config->json_output)
+ fprintf(config->output, "\"variance\" : %.2f, ", pct);
+ else if (config->csv_output)
fprintf(config->output, "%s%.2f%%", config->csv_sep, pct);
else if (pct)
fprintf(config->output, " ( +-%6.2f%% )", pct);
@@ -66,7 +74,11 @@ static void print_cgroup(struct perf_stat_config *config, struct evsel *evsel)
{
if (nr_cgroups) {
const char *cgrp_name = evsel->cgrp ? evsel->cgrp->name : "";
- fprintf(config->output, "%s%s", config->csv_sep, cgrp_name);
+
+ if (config->json_output)
+ fprintf(config->output, "\"cgroup\" : \"%s\", ", cgrp_name);
+ else
+ fprintf(config->output, "%s%s", config->csv_sep, cgrp_name);
}
}
@@ -74,69 +86,123 @@ static void print_cgroup(struct perf_stat_config *config, struct evsel *evsel)
static void aggr_printout(struct perf_stat_config *config,
struct evsel *evsel, struct aggr_cpu_id id, int nr)
{
+
+
+ if (config->json_output && !config->interval)
+ fprintf(config->output, "{");
+
switch (config->aggr_mode) {
case AGGR_CORE:
- fprintf(config->output, "S%d-D%d-C%*d%s%*d%s",
- id.socket,
- id.die,
- config->csv_output ? 0 : -8,
- id.core,
- config->csv_sep,
- config->csv_output ? 0 : 4,
- nr,
- config->csv_sep);
+ if (config->json_output) {
+ fprintf(config->output,
+ "\"core\" : \"S%d-D%d-C%d\", \"aggregate-number\" : %d, ",
+ id.socket,
+ id.die,
+ id.core,
+ nr);
+ } else {
+ fprintf(config->output, "S%d-D%d-C%*d%s%*d%s",
+ id.socket,
+ id.die,
+ config->csv_output ? 0 : -8,
+ id.core,
+ config->csv_sep,
+ config->csv_output ? 0 : 4,
+ nr,
+ config->csv_sep);
+ }
break;
case AGGR_DIE:
- fprintf(config->output, "S%d-D%*d%s%*d%s",
- id.socket,
- config->csv_output ? 0 : -8,
- id.die,
- config->csv_sep,
- config->csv_output ? 0 : 4,
- nr,
- config->csv_sep);
+ if (config->json_output) {
+ fprintf(config->output,
+ "\"die\" : \"S%d-D%d\", \"aggregate-number\" : %d, ",
+ id.socket,
+ id.die,
+ nr);
+ } else {
+ fprintf(config->output, "S%d-D%*d%s%*d%s",
+ id.socket,
+ config->csv_output ? 0 : -8,
+ id.die,
+ config->csv_sep,
+ config->csv_output ? 0 : 4,
+ nr,
+ config->csv_sep);
+ }
break;
case AGGR_SOCKET:
- fprintf(config->output, "S%*d%s%*d%s",
- config->csv_output ? 0 : -5,
- id.socket,
- config->csv_sep,
- config->csv_output ? 0 : 4,
- nr,
- config->csv_sep);
- break;
+ if (config->json_output) {
+ fprintf(config->output,
+ "\"socket\" : \"S%d\", \"aggregate-number\" : %d, ",
+ id.socket,
+ nr);
+ } else {
+ fprintf(config->output, "S%*d%s%*d%s",
+ config->csv_output ? 0 : -5,
+ id.socket,
+ config->csv_sep,
+ config->csv_output ? 0 : 4,
+ nr,
+ config->csv_sep);
+ }
+ break;
case AGGR_NODE:
- fprintf(config->output, "N%*d%s%*d%s",
- config->csv_output ? 0 : -5,
- id.node,
- config->csv_sep,
- config->csv_output ? 0 : 4,
- nr,
- config->csv_sep);
- break;
+ if (config->json_output) {
+ fprintf(config->output, "\"node\" : \"N%d\", \"aggregate-number\" : %d, ",
+ id.node,
+ nr);
+ } else {
+ fprintf(config->output, "N%*d%s%*d%s",
+ config->csv_output ? 0 : -5,
+ id.node,
+ config->csv_sep,
+ config->csv_output ? 0 : 4,
+ nr,
+ config->csv_sep);
+ }
+ break;
case AGGR_NONE:
- if (evsel->percore && !config->percore_show_thread) {
- fprintf(config->output, "S%d-D%d-C%*d%s",
- id.socket,
- id.die,
- config->csv_output ? 0 : -3,
- id.core, config->csv_sep);
- } else if (id.cpu.cpu > -1) {
- fprintf(config->output, "CPU%*d%s",
- config->csv_output ? 0 : -7,
- id.cpu.cpu, config->csv_sep);
+ if (config->json_output) {
+ if (evsel->percore && !config->percore_show_thread) {
+ fprintf(config->output, "\"core\" : \"S%d-D%d-C%d\"",
+ id.socket,
+ id.die,
+ id.core);
+ } else if (id.core > -1) {
+ fprintf(config->output, "\"cpu\" : \"%d\", ",
+ id.cpu.cpu);
+ }
+ } else {
+ if (evsel->percore && !config->percore_show_thread) {
+ fprintf(config->output, "S%d-D%d-C%*d%s",
+ id.socket,
+ id.die,
+ config->csv_output ? 0 : -3,
+ id.core, config->csv_sep);
+ } else if (id.core > -1) {
+ fprintf(config->output, "CPU%*d%s",
+ config->csv_output ? 0 : -7,
+ id.cpu.cpu, config->csv_sep);
+ }
}
break;
case AGGR_THREAD:
- fprintf(config->output, "%*s-%*d%s",
- config->csv_output ? 0 : 16,
- perf_thread_map__comm(evsel->core.threads, id.thread),
- config->csv_output ? 0 : -8,
- perf_thread_map__pid(evsel->core.threads, id.thread),
- config->csv_sep);
+ if (config->json_output) {
+ fprintf(config->output, "\"thread\" : \"%s-%d\", ",
+ perf_thread_map__comm(evsel->core.threads, id.thread),
+ perf_thread_map__pid(evsel->core.threads, id.thread));
+ } else {
+ fprintf(config->output, "%*s-%*d%s",
+ config->csv_output ? 0 : 16,
+ perf_thread_map__comm(evsel->core.threads, id.thread),
+ config->csv_output ? 0 : -8,
+ perf_thread_map__pid(evsel->core.threads, id.thread),
+ config->csv_sep);
+ }
break;
case AGGR_GLOBAL:
case AGGR_UNSET:
+ case AGGR_MAX:
default:
break;
}
@@ -234,6 +300,31 @@ static void print_metric_csv(struct perf_stat_config *config __maybe_unused,
fprintf(out, "%s%s%s%s", config->csv_sep, vals, config->csv_sep, skip_spaces(unit));
}
+static void print_metric_json(struct perf_stat_config *config __maybe_unused,
+ void *ctx,
+ const char *color __maybe_unused,
+ const char *fmt __maybe_unused,
+ const char *unit, double val)
+{
+ struct outstate *os = ctx;
+ FILE *out = os->fh;
+
+ fprintf(out, "\"metric-value\" : %f, ", val);
+ fprintf(out, "\"metric-unit\" : \"%s\"", unit);
+ if (!config->metric_only)
+ fprintf(out, "}");
+}
+
+static void new_line_json(struct perf_stat_config *config, void *ctx)
+{
+ struct outstate *os = ctx;
+
+ fputc('\n', os->fh);
+ if (os->prefix)
+ fprintf(os->fh, "%s", os->prefix);
+ aggr_printout(config, os->evsel, os->id, os->nr);
+}
+
/* Filter out some columns that don't work well in metrics only mode */
static bool valid_only_metric(const char *unit)
@@ -300,6 +391,27 @@ static void print_metric_only_csv(struct perf_stat_config *config __maybe_unused
fprintf(out, "%s%s", vals, config->csv_sep);
}
+static void print_metric_only_json(struct perf_stat_config *config __maybe_unused,
+ void *ctx, const char *color __maybe_unused,
+ const char *fmt,
+ const char *unit, double val)
+{
+ struct outstate *os = ctx;
+ FILE *out = os->fh;
+ char buf[64], *vals, *ends;
+ char tbuf[1024];
+
+ if (!valid_only_metric(unit))
+ return;
+ unit = fixunit(tbuf, os->evsel, unit);
+ snprintf(buf, sizeof(buf), fmt, val);
+ ends = vals = skip_spaces(buf);
+ while (isdigit(*ends) || *ends == '.')
+ ends++;
+ *ends = 0;
+ fprintf(out, "{\"metric-value\" : \"%s\"}", vals);
+}
+
static void new_line_metric(struct perf_stat_config *config __maybe_unused,
void *ctx __maybe_unused)
{
@@ -318,10 +430,13 @@ static void print_metric_header(struct perf_stat_config *config,
os->evsel->priv != os->evsel->evlist->selected->priv)
return;
- if (!valid_only_metric(unit))
+ if (!valid_only_metric(unit) && !config->json_output)
return;
unit = fixunit(tbuf, os->evsel, unit);
- if (config->csv_output)
+
+ if (config->json_output)
+ fprintf(os->fh, "\"unit\" : \"%s\"", unit);
+ else if (config->csv_output)
fprintf(os->fh, "%s%s", unit, config->csv_sep);
else
fprintf(os->fh, "%*s ", config->metric_only_len, unit);
@@ -367,14 +482,28 @@ static void abs_printout(struct perf_stat_config *config,
aggr_printout(config, evsel, id, nr);
- fprintf(output, fmt, avg, config->csv_sep);
+ if (config->json_output)
+ fprintf(output, "\"counter-value\" : \"%f\", ", avg);
+ else
+ fprintf(output, fmt, avg, config->csv_sep);
+
+ if (config->json_output) {
+ if (evsel->unit) {
+ fprintf(output, "\"unit\" : \"%s\", ",
+ evsel->unit);
+ }
+ } else {
+ if (evsel->unit)
+ fprintf(output, "%-*s%s",
+ config->csv_output ? 0 : config->unit_width,
+ evsel->unit, config->csv_sep);
+ }
- if (evsel->unit)
- fprintf(output, "%-*s%s",
- config->csv_output ? 0 : config->unit_width,
- evsel->unit, config->csv_sep);
- fprintf(output, "%-*s", config->csv_output ? 0 : 25, evsel__name(evsel));
+ if (config->json_output)
+ fprintf(output, "\"event\" : \"%s\", ", evsel__name(evsel));
+ else
+ fprintf(output, "%-*s", config->csv_output ? 0 : 25, evsel__name(evsel));
print_cgroup(config, evsel);
}
@@ -416,34 +545,30 @@ static void printout(struct perf_stat_config *config, struct aggr_cpu_id id, int
.nr = nr,
.evsel = counter,
};
- print_metric_t pm = print_metric_std;
+ print_metric_t pm;
new_line_t nl;
- if (config->metric_only) {
- nl = new_line_metric;
- if (config->csv_output)
- pm = print_metric_only_csv;
- else
- pm = print_metric_only;
- } else
- nl = new_line_std;
-
- if (config->csv_output && !config->metric_only) {
- static int aggr_fields[] = {
- [AGGR_GLOBAL] = 0,
- [AGGR_THREAD] = 1,
+ if (config->csv_output) {
+ static const int aggr_fields[AGGR_MAX] = {
[AGGR_NONE] = 1,
+ [AGGR_GLOBAL] = 0,
[AGGR_SOCKET] = 2,
[AGGR_DIE] = 2,
[AGGR_CORE] = 2,
+ [AGGR_THREAD] = 1,
+ [AGGR_UNSET] = 0,
+ [AGGR_NODE] = 0,
};
- pm = print_metric_csv;
- nl = new_line_csv;
- os.nfields = 3;
- os.nfields += aggr_fields[config->aggr_mode];
- if (counter->cgrp)
- os.nfields++;
+ pm = config->metric_only ? print_metric_only_csv : print_metric_csv;
+ nl = config->metric_only ? new_line_metric : new_line_csv;
+ os.nfields = 3 + aggr_fields[config->aggr_mode] + (counter->cgrp ? 1 : 0);
+ } else if (config->json_output) {
+ pm = config->metric_only ? print_metric_only_json : print_metric_json;
+ nl = config->metric_only ? new_line_metric : new_line_json;
+ } else {
+ pm = config->metric_only ? print_metric_only : print_metric_std;
+ nl = config->metric_only ? new_line_metric : new_line_std;
}
if (!config->no_csv_summary && config->csv_output &&
@@ -458,10 +583,15 @@ static void printout(struct perf_stat_config *config, struct aggr_cpu_id id, int
}
aggr_printout(config, counter, id, nr);
- fprintf(config->output, "%*s%s",
- config->csv_output ? 0 : 18,
- counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
- config->csv_sep);
+ if (config->json_output) {
+ fprintf(config->output, "\"counter-value\" : \"%s\", ",
+ counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED);
+ } else {
+ fprintf(config->output, "%*s%s",
+ config->csv_output ? 0 : 18,
+ counter->supported ? CNTR_NOT_COUNTED : CNTR_NOT_SUPPORTED,
+ config->csv_sep);
+ }
if (counter->supported) {
if (!evlist__has_hybrid(counter->evlist)) {
@@ -471,21 +601,32 @@ static void printout(struct perf_stat_config *config, struct aggr_cpu_id id, int
}
}
- fprintf(config->output, "%-*s%s",
- config->csv_output ? 0 : config->unit_width,
- counter->unit, config->csv_sep);
+ if (config->json_output) {
+ fprintf(config->output, "\"unit\" : \"%s\", ", counter->unit);
+ } else {
+ fprintf(config->output, "%-*s%s",
+ config->csv_output ? 0 : config->unit_width,
+ counter->unit, config->csv_sep);
+ }
- fprintf(config->output, "%*s",
- config->csv_output ? 0 : -25, evsel__name(counter));
+ if (config->json_output) {
+ fprintf(config->output, "\"event\" : \"%s\", ",
+ evsel__name(counter));
+ } else {
+ fprintf(config->output, "%*s",
+ config->csv_output ? 0 : -25, evsel__name(counter));
+ }
print_cgroup(config, counter);
- if (!config->csv_output)
+ if (!config->csv_output && !config->json_output)
pm(config, &os, NULL, NULL, "", 0);
print_noise(config, counter, noise);
print_running(config, run, ena);
if (config->csv_output)
pm(config, &os, NULL, NULL, "", 0);
+ else if (config->json_output)
+ pm(config, &os, NULL, NULL, "", 0);
return;
}
@@ -500,12 +641,15 @@ static void printout(struct perf_stat_config *config, struct aggr_cpu_id id, int
if (config->csv_output && !config->metric_only) {
print_noise(config, counter, noise);
print_running(config, run, ena);
+ } else if (config->json_output && !config->metric_only) {
+ print_noise(config, counter, noise);
+ print_running(config, run, ena);
}
perf_stat__print_shadow_stats(config, counter, uval,
first_shadow_cpu_map_idx(config, counter, &id),
&out, &config->metric_events, st);
- if (!config->csv_output && !config->metric_only) {
+ if (!config->csv_output && !config->metric_only && !config->json_output) {
print_noise(config, counter, noise);
print_running(config, run, ena);
}
@@ -1002,8 +1146,12 @@ static void print_metric_headers(struct perf_stat_config *config,
struct outstate os = {
.fh = config->output
};
+ bool first = true;
+
+ if (config->json_output && !config->interval)
+ fprintf(config->output, "{");
- if (prefix)
+ if (prefix && !config->json_output)
fprintf(config->output, "%s", prefix);
if (!config->csv_output && !no_indent)
@@ -1023,6 +1171,9 @@ static void print_metric_headers(struct perf_stat_config *config,
os.evsel = counter;
out.ctx = &os;
out.print_metric = print_metric_header;
+ if (!first && config->json_output)
+ fprintf(config->output, ", ");
+ first = false;
out.new_line = new_line_metric;
out.force_header = true;
perf_stat__print_shadow_stats(config, counter, 0,
@@ -1031,6 +1182,8 @@ static void print_metric_headers(struct perf_stat_config *config,
&config->metric_events,
&rt_stat);
}
+ if (config->json_output)
+ fprintf(config->output, "}");
fputc('\n', config->output);
}
@@ -1046,10 +1199,18 @@ static void print_interval(struct perf_stat_config *config,
if (config->interval_clear)
puts(CONSOLE_CLEAR);
- 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) {
+ if (!config->iostat_run && !config->json_output)
+ sprintf(prefix, "%6lu.%09lu%s", (unsigned long) ts->tv_sec,
+ ts->tv_nsec, config->csv_sep);
+ if (!config->iostat_run && config->json_output && !config->metric_only)
+ sprintf(prefix, "{\"interval\" : %lu.%09lu, ", (unsigned long)
+ ts->tv_sec, ts->tv_nsec);
+ if (!config->iostat_run && config->json_output && config->metric_only)
+ sprintf(prefix, "{\"interval\" : %lu.%09lu}", (unsigned long)
+ ts->tv_sec, ts->tv_nsec);
+
+ if ((num_print_interval == 0 && !config->csv_output && !config->json_output)
+ || config->interval_clear) {
switch (config->aggr_mode) {
case AGGR_NODE:
fprintf(output, "# time node cpus");
@@ -1089,12 +1250,19 @@ static void print_interval(struct perf_stat_config *config,
fprintf(output, " counts %*s events\n", unit_width, "unit");
}
case AGGR_UNSET:
+ case AGGR_MAX:
break;
}
}
- if ((num_print_interval == 0 || config->interval_clear) && metric_only)
+ if ((num_print_interval == 0 || config->interval_clear)
+ && metric_only && !config->json_output)
print_metric_headers(config, evlist, " ", true);
+ if ((num_print_interval == 0 || config->interval_clear)
+ && metric_only && config->json_output) {
+ fprintf(output, "{");
+ print_metric_headers(config, evlist, " ", true);
+ }
if (++num_print_interval == 25)
num_print_interval = 0;
}
@@ -1108,7 +1276,7 @@ static void print_header(struct perf_stat_config *config,
fflush(stdout);
- if (!config->csv_output) {
+ if (!config->csv_output && !config->json_output) {
fprintf(output, "\n");
fprintf(output, " Performance counter stats for ");
if (_target->bpf_str)
@@ -1301,6 +1469,9 @@ void evlist__print_counters(struct evlist *evlist, struct perf_stat_config *conf
num_print_iv = 0;
if (config->aggr_mode == AGGR_GLOBAL && prefix && !config->iostat_run)
fprintf(config->output, "%s", prefix);
+
+ if (config->json_output && !config->metric_only)
+ fprintf(config->output, "}");
}
switch (config->aggr_mode) {
@@ -1339,12 +1510,13 @@ void evlist__print_counters(struct evlist *evlist, struct perf_stat_config *conf
}
}
break;
+ case AGGR_MAX:
case AGGR_UNSET:
default:
break;
}
- if (!interval && !config->csv_output)
+ if (!interval && !config->csv_output && !config->json_output)
print_footer(config);
fflush(config->output);
diff --git a/tools/perf/util/stat.c b/tools/perf/util/stat.c
index 4a5f3b8ff820..1fc36dce2bb9 100644
--- a/tools/perf/util/stat.c
+++ b/tools/perf/util/stat.c
@@ -403,6 +403,7 @@ process_counter_values(struct perf_stat_config *config, struct evsel *evsel,
aggr->ena += count->ena;
aggr->run += count->run;
case AGGR_UNSET:
+ case AGGR_MAX:
default:
break;
}
diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
index b5aeb8e6d34b..668250022f8c 100644
--- a/tools/perf/util/stat.h
+++ b/tools/perf/util/stat.h
@@ -57,6 +57,7 @@ enum aggr_mode {
AGGR_THREAD,
AGGR_UNSET,
AGGR_NODE,
+ AGGR_MAX
};
enum {
@@ -121,6 +122,7 @@ struct perf_stat_config {
bool no_inherit;
bool identifier;
bool csv_output;
+ bool json_output;
bool interval_clear;
bool metric_only;
bool null_run;
--
2.36.0.550.gb090851708-goog
^ permalink raw reply related [flat|nested] 4+ messages in thread
* [PATCH v3 3/3] perf test: Json format checking
2022-05-17 21:59 [PATCH v3 0/3] JSON output for perf stat Ian Rogers
2022-05-17 21:59 ` [PATCH v3 1/3] perf test: Add checking for perf stat CSV output Ian Rogers
2022-05-17 21:59 ` [PATCH v3 2/3] perf stat: Add JSON output option Ian Rogers
@ 2022-05-17 21:59 ` Ian Rogers
2 siblings, 0 replies; 4+ messages in thread
From: Ian Rogers @ 2022-05-17 21:59 UTC (permalink / raw)
To: Peter Zijlstra, Ingo Molnar, Arnaldo Carvalho de Melo,
Mark Rutland, Alexander Shishkin, Jiri Olsa, Namhyung Kim,
Kan Liang, Zhengjun Xing, Sandipan Das, Claire Jensen,
Alyssa Ross, Like Xu, James Clark, Florian Fischer, linux-kernel,
linux-perf-users, Claire Jensen
Cc: Stephane Eranian, Ian Rogers
From: Claire Jensen <cjense@google.com>
Add field checking tests for perf stat JSON output.
Sanity checks the expected number of fields are present, that the
expected keys are present and they have the correct values.
Signed-off-by: Claire Jensen <cjense@google.com>
Signed-off-by: Ian Rogers <irogers@google.com>
---
.../tests/shell/lib/perf_json_output_lint.py | 91 +++++++++++
tools/perf/tests/shell/stat+json_output.sh | 147 ++++++++++++++++++
2 files changed, 238 insertions(+)
create mode 100644 tools/perf/tests/shell/lib/perf_json_output_lint.py
create mode 100755 tools/perf/tests/shell/stat+json_output.sh
diff --git a/tools/perf/tests/shell/lib/perf_json_output_lint.py b/tools/perf/tests/shell/lib/perf_json_output_lint.py
new file mode 100644
index 000000000000..c3ed2624f8f5
--- /dev/null
+++ b/tools/perf/tests/shell/lib/perf_json_output_lint.py
@@ -0,0 +1,91 @@
+#!/usr/bin/python
+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+# Basic sanity check of perf JSON output as specified in the man page.
+
+import argparse
+import sys
+import json
+
+ap = argparse.ArgumentParser()
+ap.add_argument('--no-args', action='store_true')
+ap.add_argument('--interval', action='store_true')
+ap.add_argument('--system-wide-no-aggr', action='store_true')
+ap.add_argument('--system-wide', action='store_true')
+ap.add_argument('--event', action='store_true')
+ap.add_argument('--per-core', action='store_true')
+ap.add_argument('--per-thread', action='store_true')
+ap.add_argument('--per-die', action='store_true')
+ap.add_argument('--per-node', action='store_true')
+ap.add_argument('--per-socket', action='store_true')
+args = ap.parse_args()
+
+Lines = sys.stdin.readlines()
+
+def isfloat(num):
+ try:
+ float(num)
+ return True
+ except ValueError:
+ return False
+
+
+def isint(num):
+ try:
+ int(num)
+ return True
+ except ValueError:
+ return False
+
+def is_counter_value(num):
+ return isfloat(num) or num == '<not counted>' or num == '<not supported>'
+
+def check_json_output(expected_items):
+ if expected_items != -1:
+ for line in Lines:
+ if 'failed' not in line:
+ count = 0
+ count = line.count(',')
+ if count != expected_items:
+ raise RuntimeError('wrong number of fields. counted {0}'
+ ' expected {1} in {2}\n'.format(count, exp, line))
+ checks = {
+ 'aggregate-number': lambda x: isfloat(x),
+ 'core': lambda x: True,
+ 'counter-value': lambda x: is_counter_value(x),
+ 'cgroup': lambda x: True,
+ 'cpu': lambda x: isint(x),
+ 'die': lambda x: True,
+ 'event': lambda x: True,
+ 'event-runtime': lambda x: isfloat(x),
+ 'interval': lambda x: isfloat(x),
+ 'metric-unit': lambda x: True,
+ 'metric-value': lambda x: isfloat(x),
+ 'node': lambda x: True,
+ 'pcnt-running': lambda x: isfloat(x),
+ 'socket': lambda x: True,
+ 'thread': lambda x: True,
+ 'unit': lambda x: True,
+ }
+ input = '[\n' + ','.join(Lines) + '\n]'
+ for item in json.loads(input):
+ for key, value in item.items():
+ if key not in checks:
+ raise RuntimeError(f'Unexpected key: key={key} value={value}')
+ if not checks[key](value):
+ raise RuntimeError(f'Check failed for: key={key} value={value}')
+
+
+try:
+ if args.no_args or args.system_wide or args.event:
+ expected_items = 6
+ elif args.interval or args.per_thread or args.system_wide_no_aggr:
+ expected_items = 7
+ elif args.per_core or args.per_socket or args.per_node or args.per_die:
+ expected_items = 8
+ else:
+ # If no option is specified, don't check the number of items.
+ expected_items = -1
+ check_json_output(expected_items)
+except:
+ print('Test failed for input:\n' + '\n'.join(Lines))
+ raise
diff --git a/tools/perf/tests/shell/stat+json_output.sh b/tools/perf/tests/shell/stat+json_output.sh
new file mode 100755
index 000000000000..7748b677f2f9
--- /dev/null
+++ b/tools/perf/tests/shell/stat+json_output.sh
@@ -0,0 +1,147 @@
+#!/bin/bash
+# perf stat JSON output linter
+# SPDX-License-Identifier: (LGPL-2.1 OR BSD-2-Clause)
+# Checks various perf stat JSON output commands for the
+# correct number of fields.
+
+set -e
+
+pythonchecker=$(dirname $0)/lib/perf_json_output_lint.py
+if [ "x$PYTHON" == "x" ]
+then
+ if which python3 > /dev/null
+ then
+ PYTHON=python3
+ elif which python > /dev/null
+ then
+ PYTHON=python
+ else
+ echo Skipping test, python not detected please set environment variable PYTHON.
+ exit 2
+ fi
+fi
+
+# Return true if perf_event_paranoid is > $1 and not running as root.
+function ParanoidAndNotRoot()
+{
+ [ $(id -u) != 0 ] && [ $(cat /proc/sys/kernel/perf_event_paranoid) -gt $1 ]
+}
+
+check_no_args()
+{
+ echo -n "Checking json output: no args "
+ perf stat -j true 2>&1 | $PYTHON $pythonchecker --no-args
+ echo "[Success]"
+}
+
+check_system_wide()
+{
+ echo -n "Checking json output: system wide "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -j -a true 2>&1 | $PYTHON $pythonchecker --system-wide
+ echo "[Success]"
+}
+
+check_system_wide_no_aggr()
+{
+ echo -n "Checking json output: system wide "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ echo -n "Checking json output: system wide no aggregation "
+ perf stat -j -A -a --no-merge true 2>&1 | $PYTHON $pythonchecker --system-wide-no-aggr
+ echo "[Success]"
+}
+
+check_interval()
+{
+ echo -n "Checking json output: interval "
+ perf stat -j -I 1000 true 2>&1 | $PYTHON $pythonchecker --interval
+ echo "[Success]"
+}
+
+
+check_event()
+{
+ echo -n "Checking json output: event "
+ perf stat -j -e cpu-clock true 2>&1 | $PYTHON $pythonchecker --event
+ echo "[Success]"
+}
+
+check_per_core()
+{
+ echo -n "Checking json output: per core "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -j --per-core -a true 2>&1 | $PYTHON $pythonchecker --per-core
+ echo "[Success]"
+}
+
+check_per_thread()
+{
+ echo -n "Checking json output: per thread "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -j --per-thread -a true 2>&1 | $PYTHON $pythonchecker --per-thread
+ echo "[Success]"
+}
+
+check_per_die()
+{
+ echo -n "Checking json output: per die "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -j --per-die -a true 2>&1 | $PYTHON $pythonchecker --per-die
+ echo "[Success]"
+}
+
+check_per_node()
+{
+ echo -n "Checking json output: per node "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -j --per-node -a true 2>&1 | $PYTHON $pythonchecker --per-node
+ echo "[Success]"
+}
+
+check_per_socket()
+{
+ echo -n "Checking json output: per socket "
+ if ParanoidAndNotRoot 0
+ then
+ echo "[Skip] parnoia and not root"
+ return
+ fi
+ perf stat -j --per-socket -a true 2>&1 | $PYTHON $pythonchecker --per-socket
+ echo "[Success]"
+}
+
+check_no_args
+check_system_wide
+check_system_wide_no_aggr
+check_interval
+check_event
+check_per_core
+check_per_thread
+check_per_die
+check_per_node
+check_per_socket
+exit 0
--
2.36.0.550.gb090851708-goog
^ permalink raw reply related [flat|nested] 4+ messages in thread
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2022-05-17 21:59 [PATCH v3 0/3] JSON output for perf stat Ian Rogers
2022-05-17 21:59 ` [PATCH v3 1/3] perf test: Add checking for perf stat CSV output Ian Rogers
2022-05-17 21:59 ` [PATCH v3 2/3] perf stat: Add JSON output option Ian Rogers
2022-05-17 21:59 ` [PATCH v3 3/3] perf test: Json format checking Ian Rogers
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