From ab6baaae273572909f1e957fc27a9459fc95dd8c Mon Sep 17 00:00:00 2001 From: Namhyung Kim Date: Wed, 23 Nov 2022 10:02:06 -0800 Subject: [PATCH] perf stat: Fix JSON output in metric-only mode It generated a broken JSON output when aggregation mode or cgroup is used with --metric-only option. Also get rid of the header line and make the output single line for each entry. It needs to know whether the current metric is the first one or not. So add 'first' field in the outstate and mark it false after printing. Before: # perf stat -a -j --metric-only true {"unit" : "GHz"}{"unit" : "insn per cycle"}{"unit" : "branch-misses of all branches"} {{"metric-value" : "0.797"}{"metric-value" : "1.65"}{"metric-value" : "0.89"} ^ # perf stat -a -j --metric-only --per-socket true {"unit" : "GHz"}{"unit" : "insn per cycle"}{"unit" : "branch-misses of all branches"} {"socket" : "S0", "aggregate-number" : 8, {"metric-value" : "0.295"}{"metric-value" : "1.88"}{"metric-value" : "0.64"} ^ After: # perf stat -a -j --metric-only true {"GHz" : "0.990", "insn per cycle" : "2.06", "branch-misses of all branches" : "0.59"} # perf stat -a -j --metric-only --per-socket true {"socket" : "S0", "aggregate-number" : 8, "GHz" : "0.439", "insn per cycle" : "2.14", "branch-misses of all branches" : "0.51"} Signed-off-by: Namhyung Kim Acked-by: Ian Rogers Cc: Adrian Hunter Cc: Athira Jajeev Cc: Ingo Molnar Cc: James Clark Cc: Jiri Olsa Cc: Kan Liang Cc: Peter Zijlstra Cc: Xing Zhengjun Link: https://lore.kernel.org/r/20221123180208.2068936-14-namhyung@kernel.org Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/stat-display.c | 42 ++++++++++++++++++++++++------------------ 1 file changed, 24 insertions(+), 18 deletions(-) diff --git a/tools/perf/util/stat-display.c b/tools/perf/util/stat-display.c index 335627e..4364011 100644 --- a/tools/perf/util/stat-display.c +++ b/tools/perf/util/stat-display.c @@ -279,9 +279,6 @@ static void print_aggr_id_json(struct perf_stat_config *config, { FILE *output = config->output; - if (!config->interval) - fputc('{', output); - switch (config->aggr_mode) { case AGGR_CORE: fprintf(output, "\"core\" : \"S%d-D%d-C%d\", \"aggregate-number\" : %d, ", @@ -335,6 +332,7 @@ static void aggr_printout(struct perf_stat_config *config, struct outstate { FILE *fh; bool newline; + bool first; const char *prefix; int nfields; int nr; @@ -491,6 +489,7 @@ static void print_metric_only(struct perf_stat_config *config, color_snprintf(str, sizeof(str), color ?: "", fmt, val); fprintf(out, "%*s ", mlen, str); + os->first = false; } static void print_metric_only_csv(struct perf_stat_config *config __maybe_unused, @@ -512,6 +511,7 @@ static void print_metric_only_csv(struct perf_stat_config *config __maybe_unused ends++; *ends = 0; fprintf(out, "%s%s", vals, config->csv_sep); + os->first = false; } static void print_metric_only_json(struct perf_stat_config *config __maybe_unused, @@ -532,7 +532,8 @@ static void print_metric_only_json(struct perf_stat_config *config __maybe_unuse while (isdigit(*ends) || *ends == '.') ends++; *ends = 0; - fprintf(out, "{\"metric-value\" : \"%s\"}", vals); + fprintf(out, "%s\"%s\" : \"%s\"", os->first ? "" : ", ", unit, vals); + os->first = false; } static void new_line_metric(struct perf_stat_config *config __maybe_unused, @@ -561,7 +562,7 @@ static void print_metric_header(struct perf_stat_config *config, unit = fixunit(tbuf, os->evsel, unit); if (config->json_output) - fprintf(os->fh, "{\"unit\" : \"%s\"}", unit); + return; else if (config->csv_output) fprintf(os->fh, "%s%s", unit, config->csv_sep); else @@ -821,6 +822,8 @@ static void print_counter_aggrdata(struct perf_stat_config *config, run = aggr->counts.run; if (!metric_only) { + if (config->json_output) + fputc('{', output); if (os->prefix) fprintf(output, "%s", os->prefix); else if (config->summary && config->csv_output && @@ -844,9 +847,12 @@ static void print_metric_begin(struct perf_stat_config *config, struct aggr_cpu_id id; struct evsel *evsel; + os->first = true; if (!config->metric_only) return; + if (config->json_output) + fputc('{', config->output); if (os->prefix) fprintf(config->output, "%s", os->prefix); @@ -855,7 +861,7 @@ static void print_metric_begin(struct perf_stat_config *config, aggr = &evsel->stats->aggr[aggr_idx]; aggr_printout(config, evsel, id, aggr->nr); - print_cgroup(config, os->cgrp); + print_cgroup(config, os->cgrp ? : evsel->cgrp); } static void print_metric_end(struct perf_stat_config *config) @@ -863,6 +869,8 @@ static void print_metric_end(struct perf_stat_config *config) if (!config->metric_only) return; + if (config->json_output) + fputc('}', config->output); fputc('\n', config->output); } @@ -1005,11 +1013,9 @@ static void print_metric_headers_csv(struct perf_stat_config *config, fputs(aggr_header_csv[config->aggr_mode], config->output); } -static void print_metric_headers_json(struct perf_stat_config *config, +static void print_metric_headers_json(struct perf_stat_config *config __maybe_unused, bool no_indent __maybe_unused) { - if (config->interval) - fputs("{\"unit\" : \"sec\"}", config->output); } static void print_metric_headers(struct perf_stat_config *config, @@ -1049,7 +1055,9 @@ static void print_metric_headers(struct perf_stat_config *config, &config->metric_events, &rt_stat); } - fputc('\n', config->output); + + if (!config->json_output) + fputc('\n', config->output); } static void prepare_interval(struct perf_stat_config *config, @@ -1058,17 +1066,14 @@ static void prepare_interval(struct perf_stat_config *config, if (config->iostat_run) return; - if (config->csv_output) + if (config->json_output) + scnprintf(prefix, len, "\"interval\" : %lu.%09lu, ", + (unsigned long) ts->tv_sec, ts->tv_nsec); + else if (config->csv_output) scnprintf(prefix, len, "%lu.%09lu%s", (unsigned long) ts->tv_sec, ts->tv_nsec, config->csv_sep); - else if (!config->json_output) - scnprintf(prefix, len, "%6lu.%09lu ", - (unsigned long) ts->tv_sec, ts->tv_nsec); - else if (!config->metric_only) - scnprintf(prefix, len, "{\"interval\" : %lu.%09lu, ", - (unsigned long) ts->tv_sec, ts->tv_nsec); else - scnprintf(prefix, len, "{\"interval\" : %lu.%09lu}", + scnprintf(prefix, len, "%6lu.%09lu ", (unsigned long) ts->tv_sec, ts->tv_nsec); } @@ -1365,6 +1370,7 @@ void evlist__print_counters(struct evlist *evlist, struct perf_stat_config *conf char buf[64]; struct outstate os = { .fh = config->output, + .first = true, }; if (config->iostat_run) -- 2.7.4