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Date:   Thu, 7 Jun 2018 15:57:57 -0300
From:   Arnaldo Carvalho de Melo <acme@kernel.org>
To:     Jiri Olsa <jolsa@kernel.org>
Cc:     Peter Zijlstra <a.p.zijlstra@chello.nl>,
        lkml <linux-kernel@vger.kernel.org>,
        Ingo Molnar <mingo@kernel.org>,
        Namhyung Kim <namhyung@kernel.org>,
        David Ahern <dsahern@gmail.com>,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Stephane Eranian <eranian@google.com>,
        Milian Wolff <milian.wolff@kdab.com>,
        Andi Kleen <andi@firstfloor.org>,
        Frederic Weisbecker <frederic@kernel.org>
Subject: Re: [PATCH 03/10] perf stat: Add --interval-clear option
Message-ID: <20180607185757.GB17292@kernel.org>
References: <20180606221513.11302-1-jolsa@kernel.org>
 <20180606221513.11302-4-jolsa@kernel.org>
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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@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
>  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