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Message-ID: <YRVnFtfgn0/IFqnW@kernel.org>
Date: Thu, 12 Aug 2021 15:23:18 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Claire Jensen <cjense@...gle.com>
Cc: peterz@...radead.org, mingo@...hat.com, mark.rutland@....com,
alexander.shishkin@...ux.intel.com, jolsa@...hat.com,
namhyung@...nel.org, yao.jin@...ux.intel.com, song@...nel.org,
andi@...stfloor.org, adrian.hunter@...el.com,
kan.liang@...ux.intel.com, james.clark@....com,
alexander.antonov@...ux.intel.com, changbin.du@...el.com,
liuqi115@...wei.com, irogers@...gle.com, eranian@...gle.com,
linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org
Subject: Re: [PATCH 1/1] perf stat: Add JSON output option and testing.
Em Wed, Aug 11, 2021 at 10:43:18PM +0000, Claire Jensen escreveu:
<SNIP>
> +++ b/tools/perf/util/stat-display.c
> @@ -1,25 +1,25 @@
> #include <stdlib.h>
> #include <stdio.h>
> #include <inttypes.h>
> -#include <linux/string.h>
> -#include <linux/time64.h>
> +#include "third_party/linux_tools/src/tools/include/linux/string.h"
> +#include "third_party/linux_tools/src/tools/include/linux/time64.h"
> #include <math.h>
> -#include "color.h"
> -#include "counts.h"
> -#include "evlist.h"
> -#include "evsel.h"
> -#include "stat.h"
> -#include "top.h"
> -#include "thread_map.h"
> -#include "cpumap.h"
> -#include "string2.h"
> -#include <linux/ctype.h>
> -#include "cgroup.h"
> -#include <api/fs/fs.h>
> -#include "util.h"
> -#include "iostat.h"
> -#include "pmu-hybrid.h"
> -#include "evlist-hybrid.h"
> +#include "third_party/linux_tools/src/tools/perf/util/color.h"
> +#include "third_party/linux_tools/src/tools/perf/util/counts.h"
> +#include "third_party/linux_tools/src/tools/perf/util/evlist.h"
> +#include "third_party/linux_tools/src/tools/perf/util/evsel.h"
> +#include "third_party/linux_tools/src/tools/perf/util/stat.h"
> +#include "third_party/linux_tools/src/tools/perf/util/top.h"
> +#include "third_party/linux_tools/src/tools/perf/util/thread_map.h"
> +#include "third_party/linux_tools/src/tools/perf/util/cpumap.h"
> +#include "third_party/linux_tools/src/tools/perf/util/string2.h"
> +#include "third_party/linux_tools/src/tools/include/linux/ctype.h"
> +#include "third_party/linux_tools/src/tools/perf/util/cgroup.h"
> +#include "third_party/linux_tools/src/tools/lib/api/fs/fs.h"
> +#include "third_party/linux_tools/src/tools/perf/util/util.h"
> +#include "third_party/linux_tools/src/tools/perf/util/iostat.h"
> +#include "third_party/linux_tools/src/tools/perf/util/pmu-hybrid.h"
> +#include "third_party/linux_tools/src/tools/perf/util/evlist-hybrid.h"
Oops, these shouldn'be here, right? :-)
Some comments: Please separate the 'perf test' entry from the feature
being introduced, also align 'TODO' entries in the if block and remove
that b/somenumber (what is that for?)
Pay attention to indentation, you removed from several if blocks.
More below
Thanks for working on this, I hope the 'stat' guys can test this and
provide feedback.
- Arnaldo
> #define CNTR_NOT_SUPPORTED "<not supported>"
> #define CNTR_NOT_COUNTED "<not counted>"
> @@ -27,15 +27,21 @@
> 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) {
> +
Please no blank line after { and the variables
> + 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, ",
Why this newline before the format string?
> + 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,
> @@ -43,7 +49,9 @@ 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);
> @@ -63,9 +71,16 @@ static void print_noise(struct perf_stat_config *config,
>
> static void print_cgroup(struct perf_stat_config *config, struct evsel *evsel)
> {
> - if (nr_cgroups) {
> + if (config->json_output && nr_cgroups) {
> const char *cgrp_name = evsel->cgrp ? evsel->cgrp->name : "";
> +
> + fprintf(config->output, "\"cgroup\" : \"%s\", ", cgrp_name);
> + } else {
> + if (nr_cgroups) {
> + const char *cgrp_name = evsel->cgrp ? evsel->cgrp->name : "";
> +
> fprintf(config->output, "%s%s", config->csv_sep, cgrp_name);
> + }
> }
> }
>
> @@ -73,8 +88,20 @@ 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:
> + if (config->json_output) {
> + fprintf(config->output, "\"core\" : \"S%d-D%d-C%d\", \"cpu\" : %d, ",
> + id.socket,
> + id.die,
> + id.core,
> + nr);
> + } else {
Indentation, align if/else
> fprintf(config->output, "S%d-D%d-C%*d%s%*d%s",
> id.socket,
> id.die,
> @@ -84,56 +111,95 @@ static void aggr_printout(struct perf_stat_config *config,
> 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\", \"cpu\" : %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);
> + if (config->json_output) {
> + fprintf(config->output, "\"socket\" : \"S%d\", \"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);
> + if (config->json_output) {
> + fprintf(config->output, "\"node\" : \"N%d\", \"cpu\" : %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);
> + 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\", ",
> + evsel__cpus(evsel)->map[id.core]);
> + }
> + } 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,
> evsel__cpus(evsel)->map[id.core],
> 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:
> @@ -184,20 +250,56 @@ static void print_metric_std(struct perf_stat_config *config,
>
> os->newline = false;
>
> + if (unit == NULL || fmt == NULL) {
> + fprintf(out, "%-*s", METRIC_LEN, "");
> + return;
> + }
> +
> + if (newline)
> + do_new_line_std(config, os);
> +
> + n = fprintf(out, " # ");
> + if (color)
> + n += color_fprintf(out, color, fmt, val);
> + else
> + n += fprintf(out, fmt, val);
> + fprintf(out, " %-*s", METRIC_LEN - n - 1, unit);
> +}
> +
> +static void print_metric_csv(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;
> +
> if (unit == NULL || fmt == NULL) {
> - fprintf(out, "%-*s", METRIC_LEN, "");
> + fprintf(out, "%s%s", config->csv_sep, config->csv_sep);
> return;
> }
> + snprintf(buf, sizeof(buf), fmt, val);
> + ends = vals = skip_spaces(buf);
> + while (isdigit(*ends) || *ends == '.')
> + ends++;
> + *ends = 0;
> + fprintf(out, "%s%s%s%s", config->csv_sep, vals,
> + config->csv_sep, skip_spaces(unit));
> +}
>
> - if (newline)
> - do_new_line_std(config, os);
> +static void print_metric_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;
>
> - n = fprintf(out, " # ");
> - if (color)
> - n += color_fprintf(out, color, fmt, val);
> - else
> - n += fprintf(out, fmt, val);
> - fprintf(out, " %-*s", METRIC_LEN - n - 1, unit);
> + fprintf(out, "\"metric-value\" : %f, ", val);
> + fprintf(out, "\"metric-unit\" : \"%s\"", unit);
> + if (!config->metric_only)
> + fprintf(out, "}");
> }
>
> static void new_line_csv(struct perf_stat_config *config, void *ctx)
> @@ -213,25 +315,14 @@ static void new_line_csv(struct perf_stat_config *config, void *ctx)
> fputs(config->csv_sep, os->fh);
> }
>
> -static void print_metric_csv(struct perf_stat_config *config __maybe_unused,
> - void *ctx,
> - const char *color __maybe_unused,
> - const char *fmt, const char *unit, double val)
> +static void new_line_json(struct perf_stat_config *config, void *ctx)
> {
> struct outstate *os = ctx;
> - FILE *out = os->fh;
> - char buf[64], *vals, *ends;
>
> - if (unit == NULL || fmt == NULL) {
> - fprintf(out, "%s%s", config->csv_sep, config->csv_sep);
> - return;
> - }
> - snprintf(buf, sizeof(buf), fmt, val);
> - ends = vals = skip_spaces(buf);
> - while (isdigit(*ends) || *ends == '.')
> - ends++;
> - *ends = 0;
> - fprintf(out, "%s%s%s%s", config->csv_sep, vals, config->csv_sep, skip_spaces(unit));
> + 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 */
> @@ -292,7 +383,7 @@ static void print_metric_only_csv(struct perf_stat_config *config __maybe_unused
> if (!valid_only_metric(unit))
> return;
> unit = fixunit(tbuf, os->evsel, unit);
> - snprintf(buf, sizeof buf, fmt, val);
> + snprintf(buf, sizeof(buf), fmt, val);
> ends = vals = skip_spaces(buf);
> while (isdigit(*ends) || *ends == '.')
> ends++;
> @@ -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);
> @@ -369,14 +484,28 @@ 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 (evsel->unit)
> - fprintf(output, "%-*s%s",
> - config->csv_output ? 0 : config->unit_width,
> - evsel->unit, 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);
> + }
>
> - 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);
> }
> @@ -425,6 +554,8 @@ static void printout(struct perf_stat_config *config, struct aggr_cpu_id id, int
> nl = new_line_metric;
> if (config->csv_output)
> pm = print_metric_only_csv;
> + else if (config->json_output)
> + pm = print_metric_only_json;
> else
> pm = print_metric_only;
> } else
> @@ -448,6 +579,24 @@ static void printout(struct perf_stat_config *config, struct aggr_cpu_id id, int
> os.nfields++;
> }
>
> + if (config->json_output && !config->metric_only) {
> + static int aggr_fields[] = {
> + [AGGR_GLOBAL] = 0,
> + [AGGR_THREAD] = 1,
> + [AGGR_NONE] = 1,
> + [AGGR_SOCKET] = 2,
> + [AGGR_DIE] = 2,
> + [AGGR_CORE] = 2,
> + };
> +
> + pm = print_metric_json;
> + nl = new_line_json;
> + os.nfields = 3;
> + os.nfields += aggr_fields[config->aggr_mode];
> + if (counter->cgrp)
> + os.nfields++;
> + }
> +
> if (!config->no_csv_summary && config->csv_output &&
> config->summary && !config->interval) {
> fprintf(config->output, "%16s%s", "summary", config->csv_sep);
> @@ -460,10 +609,15 @@ 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)) {
> @@ -473,21 +627,32 @@ 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;
> }
>
> @@ -502,12 +667,15 @@ 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(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);
> }
> @@ -866,7 +1034,8 @@ static void print_counter_aggr(struct perf_stat_config *config,
> fprintf(output, "%s", prefix);
>
> uval = cd.avg * counter->scale;
> - printout(config, cpu_map__empty_aggr_cpu_id(), 0, counter, uval, prefix, cd.avg_running,
> + printout(config, cpu_map__empty_aggr_cpu_id(), 0, counter,
> + uval, prefix, cd.avg_running,
> cd.avg_enabled, cd.avg, &rt_stat);
> if (!metric_only)
> fprintf(output, "\n");
> @@ -981,8 +1150,12 @@ static void print_metric_headers(struct perf_stat_config *config,
> struct outstate os = {
> .fh = config->output
> };
> + bool first = true;
>
> - if (prefix)
> + if (config->json_output && !config->interval)
> + fprintf(config->output, "{");
> +
> + if (prefix && !config->json_output)
> fprintf(config->output, "%s", prefix);
>
> if (!config->csv_output && !no_indent)
> @@ -1002,6 +1175,9 @@ 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,
> @@ -1010,6 +1186,8 @@ 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);
> }
>
> @@ -1025,10 +1203,18 @@ 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");
> @@ -1072,8 +1258,14 @@ static void print_interval(struct perf_stat_config *config,
> }
> }
>
> - 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;
> }
> @@ -1087,7 +1279,7 @@ 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)
> @@ -1276,6 +1468,9 @@ 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) {
> @@ -1319,7 +1514,7 @@ void evlist__print_counters(struct evlist *evlist, struct perf_stat_config *conf
> 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-shadow.c b/tools/perf/util/stat-shadow.c
> index 34a7f5c1fff7..8a04b6433591 100644
> --- a/tools/perf/util/stat-shadow.c
> +++ b/tools/perf/util/stat-shadow.c
> @@ -981,8 +981,9 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
> total = max(total, runtime_stat_avg(st,
> STAT_STALLED_CYCLES_BACK,
> cpu, &rsd));
> -
> - if (total && avg) {
> +// TODO: Refactor code to avoid errors in JSON output b/194436171
> +// !config->json_output is temporary workaround for JSON linter.
> + if (total && avg && !config->json_output) {
> out->new_line(config, ctxp);
> ratio = total / avg;
> print_metric(config, ctxp, NULL, "%7.2f ",
> diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h
> index 32c8527de347..2bde525e7630 100644
> --- a/tools/perf/util/stat.h
> +++ b/tools/perf/util/stat.h
> @@ -117,6 +117,7 @@ struct perf_stat_config {
> bool no_inherit;
> bool identifier;
> bool csv_output;
> + bool json_output;
> bool interval_clear;
> bool metric_only;
> bool null_run;
> --
> 2.32.0.605.g8dce9f2422-goog
>
--
- Arnaldo
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