Re: [PATCH 03/10] perf stat: Add --interval-clear option

From: Arnaldo Carvalho de Melo
Date: Thu Jun 07 2018 - 14:58:06 EST


Em Thu, Jun 07, 2018 at 12:15:06AM +0200, Jiri Olsa escreveu:
> Adding --interval-clear option to clear the screen
> before next interval.

Better than:

watch -n 0 perf stat -a sleep 1

:-)

Tested and applied,

- Arnaldo

> Link: http://lkml.kernel.org/n/tip-8zobiwghr6t9f9a4o886cmau@xxxxxxxxxxxxxx
> Signed-off-by: Jiri Olsa <jolsa@xxxxxxxxxx>
> ---
> tools/perf/Documentation/perf-stat.txt | 3 +++
> tools/perf/builtin-stat.c | 11 +++++++++--
> 2 files changed, 12 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/Documentation/perf-stat.txt b/tools/perf/Documentation/perf-stat.txt
> index 5dfe102fb5b5..b10a90b6a718 100644
> --- a/tools/perf/Documentation/perf-stat.txt
> +++ b/tools/perf/Documentation/perf-stat.txt
> @@ -178,6 +178,9 @@ 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'
>
> +--interval-clear::
> +Clear the screen before next interval.
> +
> --timeout msecs::
> Stop the 'perf stat' session and print count deltas after N milliseconds (minimum: 10 ms).
> This option is not supported with the "-I" option.
> diff --git a/tools/perf/builtin-stat.c b/tools/perf/builtin-stat.c
> index fce46252f89c..067d8b5b2c83 100644
> --- a/tools/perf/builtin-stat.c
> +++ b/tools/perf/builtin-stat.c
> @@ -65,6 +65,7 @@
> #include "util/tool.h"
> #include "util/string2.h"
> #include "util/metricgroup.h"
> +#include "util/top.h"
> #include "asm/bug.h"
>
> #include <linux/time64.h>
> @@ -173,6 +174,7 @@ static struct cpu_map *aggr_map;
> static aggr_get_id_t aggr_get_id;
> static bool append_file;
> static bool interval_count;
> +static bool interval_clear;
> static const char *output_name;
> static int output_fd;
> static int print_free_counters_hint;
> @@ -1713,9 +1715,12 @@ static void print_interval(char *prefix, struct timespec *ts)
> FILE *output = stat_config.output;
> static int num_print_interval;
>
> + if (interval_clear)
> + puts(CONSOLE_CLEAR);
> +
> sprintf(prefix, "%6lu.%09lu%s", ts->tv_sec, ts->tv_nsec, csv_sep);
>
> - if (num_print_interval == 0 && !csv_output) {
> + if ((num_print_interval == 0 && !csv_output) || interval_clear) {
> switch (stat_config.aggr_mode) {
> case AGGR_SOCKET:
> fprintf(output, "# time socket cpus");
> @@ -1747,7 +1752,7 @@ static void print_interval(char *prefix, struct timespec *ts)
> }
> }
>
> - if (num_print_interval == 0 && metric_only)
> + if ((num_print_interval == 0 && metric_only) || interval_clear)
> print_metric_headers(" ", true);
> if (++num_print_interval == 25)
> num_print_interval = 0;
> @@ -2066,6 +2071,8 @@ static const struct option stat_options[] = {
> "(overhead is possible for values <= 100ms)"),
> OPT_INTEGER(0, "interval-count", &stat_config.times,
> "print counts for fixed number of times"),
> + OPT_BOOLEAN(0, "interval-clear", &interval_clear,
> + "clear screen in between new interval"),
> OPT_UINTEGER(0, "timeout", &stat_config.timeout,
> "stop workload and print counts after a timeout period in ms (>= 10ms)"),
> OPT_SET_UINT(0, "per-socket", &stat_config.aggr_mode,
> --
> 2.13.6