From db06a269ecbb1d71d534fc5713624eeeee0b8f92 Mon Sep 17 00:00:00 2001 From: yuzhoujian Date: Mon, 29 Jan 2018 10:25:22 +0100 Subject: [PATCH] perf stat: Add support to print counts for fixed times Introduce a new option to print counts for fixed number of times and update 'perf stat' documentation accordingly. Show below is the output of the new option for perf stat. $ perf stat -I 1000 --interval-count 2 -e cycles -a # time counts unit events 1.002827089 93,884,870 cycles 2.004231506 56,573,446 cycles We can just print the counts for several times with this newly introduced option. The usage of it is a little like 'vmstat', and it should be used together with "-I" option. $ vmstat -n 1 2 procs ---------memory-------------- --swap- ----io-- -system-- ------cpu--- r b swpd free buff cache si so bi bo in cs us sy id wa st 0 0 0 78270544 547484 51732076 0 0 0 20 1 1 1 0 99 0 0 0 0 0 78270512 547484 51732080 0 0 0 16 477 1555 0 0 100 0 0 Changes since v3: - merge interval_count check and times check to one line. - fix the wrong indent in stat.h - use stat_config.times instead of 'times' in cmd_stat function. Changes since v2: - none. Changes since v1: - change the name of the new option "times-print" to "interval-count". - keep the new option interval specifically. Signed-off-by: yuzhoujian Acked-by: Jiri Olsa Tested-by: Arnaldo Carvalho de Melo Cc: Adrian Hunter Cc: Alexander Shishkin Cc: David Ahern Cc: Kan Liang Cc: Milian Wolff Cc: Namhyung Kim Cc: Peter Zijlstra Cc: Wang Nan Link: http://lkml.kernel.org/r/1517217923-8302-2-git-send-email-ufo19890607@gmail.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/Documentation/perf-stat.txt | 5 +++++ tools/perf/builtin-stat.c | 20 +++++++++++++++++++- tools/perf/util/stat.h | 1 + 3 files changed, 25 insertions(+), 1 deletion(-) diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt index 823fce7674bb..47a21645f60c 100644 --- a/tools/perf/Documentation/perf-stat.txt +++ b/tools/perf/Documentation/perf-stat.txt @@ -146,6 +146,11 @@ Print count deltas every N milliseconds (minimum: 10ms) The overhead percentage could be high in some cases, for instance with small, sub 100ms intervals. Use with caution. example: 'perf stat -I 1000 -e cycles -a sleep 5' +--interval-count times:: +Print count deltas for fixed number of times. +This option should be used together with "-I" option. + example: 'perf stat -I 1000 --interval-count 2 -e cycles -a' + --metric-only:: Only print computed metrics. Print them in a single line. Don't show any raw values. Not supported with --per-thread. diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c index 98bf9d32f222..7d1d7613bf56 100644 --- a/tools/perf/builtin-stat.c +++ b/tools/perf/builtin-stat.c @@ -168,6 +168,7 @@ static struct timespec ref_time; static struct cpu_map *aggr_map; static aggr_get_id_t aggr_get_id; static bool append_file; +static bool interval_count; static const char *output_name; static int output_fd; static int print_free_counters_hint; @@ -571,6 +572,7 @@ static struct perf_evsel *perf_evsel__reset_weak_group(struct perf_evsel *evsel) static int __run_perf_stat(int argc, const char **argv) { int interval = stat_config.interval; + int times = stat_config.times; char msg[BUFSIZ]; unsigned long long t0, t1; struct perf_evsel *counter; @@ -700,6 +702,8 @@ static int __run_perf_stat(int argc, const char **argv) while (!waitpid(child_pid, &status, WNOHANG)) { nanosleep(&ts, NULL); process_interval(); + if (interval_count && !(--times)) + break; } } waitpid(child_pid, &status, 0); @@ -716,8 +720,11 @@ static int __run_perf_stat(int argc, const char **argv) enable_counters(); while (!done) { nanosleep(&ts, NULL); - if (interval) + if (interval) { process_interval(); + if (interval_count && !(--times)) + break; + } } } @@ -1891,6 +1898,8 @@ static const struct option stat_options[] = { "command to run after to the measured command"), OPT_UINTEGER('I', "interval-print", &stat_config.interval, "print counts at regular interval in ms (>= 10)"), + OPT_INTEGER(0, "interval-count", &stat_config.times, + "print counts for fixed number of times"), OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode, "aggregate counts per processor socket", AGGR_SOCKET), OPT_SET_UINT(0, "per-core", &stat_config.aggr_mode, @@ -2870,6 +2879,15 @@ int cmd_stat(int argc, const char **argv) "The overhead percentage could be high in some cases. " "Please proceed with caution.\n"); } + if (stat_config.times && interval) + interval_count = true; + else if (stat_config.times && !interval) { + pr_err("interval-count option should be used together with " + "interval-print.\n"); + parse_options_usage(stat_usage, stat_options, "interval-count", 0); + parse_options_usage(stat_usage, stat_options, "I", 1); + goto out; + } if (perf_evlist__alloc_stats(evsel_list, interval)) goto out; diff --git a/tools/perf/util/stat.h b/tools/perf/util/stat.h index dbc6f7134f61..540fbb350e53 100644 --- a/tools/perf/util/stat.h +++ b/tools/perf/util/stat.h @@ -90,6 +90,7 @@ struct perf_stat_config { bool scale; FILE *output; unsigned int interval; + int times; struct runtime_stat *stats; int stats_num; }; -- GitLab