Re: [PATCH v2 7/8] perf sched timehist: Add -V/--cpu-visual option

[Arnaldo Carvalho de Melo]

Em Wed, Nov 16, 2016 at 03:06:33PM +0900, Namhyung Kim escreveu:
> From: David Ahern <dsahern@xxxxxxxxx>
> 
> The -V option provides a visual aid for sched switches by cpu:
> 
>   $ perf sched timehist -V
>              time    cpu  0123456789abc  task name              b/n time  sch delay   run time
>                                          [tid/pid]                (msec)     (msec)     (msec)
>   --------------- ------  -------------  --------------------  ---------  ---------  ---------
>   ...
>    2412598.429696 [0009]           i     <idle>                    0.000      0.000      0.000
>    2412598.429767 [0002]    s            perf[7219]                0.000      0.000      0.000
>    2412598.429783 [0009]           s     perf[7220]                0.000      0.006      0.087
>    2412598.429794 [0010]            i    <idle>                    0.000      0.000      0.000
>    2412598.429795 [0009]           s     migration/9[53]           0.000      0.003      0.011
>    2412598.430370 [0010]            s    sleep[7220]               0.011      0.000      0.576
>    2412598.432584 [0003]     i           <idle>                    0.000      0.000      0.000
>   ...

Forgot to add docs, will do.

- Arnaldo
 
> Signed-off-by: David Ahern <dsahern@xxxxxxxxx>
> Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
> ---
>  tools/perf/builtin-sched.c | 44 ++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 42 insertions(+), 2 deletions(-)
> 
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 1f8731640809..829468defa07 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -201,6 +201,7 @@ struct perf_sched {
>  	bool		summary_only;
>  	bool		show_callchain;
>  	unsigned int	max_stack;
> +	bool		show_cpu_visual;
>  	bool		show_wakeups;
>  	u64		skipped_samples;
>  };
> @@ -1783,10 +1784,23 @@ static char *timehist_get_commstr(struct thread *thread)
>  	return str;
>  }
>  
> -static void timehist_header(void)
> +static void timehist_header(struct perf_sched *sched)
>  {
> +	u32 ncpus = sched->max_cpu + 1;
> +	u32 i, j;
> +
>  	printf("%15s %6s ", "time", "cpu");
>  
> +	if (sched->show_cpu_visual) {
> +		printf(" ");
> +		for (i = 0, j = 0; i < ncpus; ++i) {
> +			printf("%x", j++);
> +			if (j > 15)
> +				j = 0;
> +		}
> +		printf(" ");
> +	}
> +
>  	printf(" %-20s  %9s  %9s  %9s",
>  		"task name", "wait time", "sch delay", "run time");
>  
> @@ -1797,6 +1811,9 @@ static void timehist_header(void)
>  	 */
>  	printf("%15s %-6s ", "", "");
>  
> +	if (sched->show_cpu_visual)
> +		printf(" %*s ", ncpus, "");
> +
>  	printf(" %-20s  %9s  %9s  %9s\n", "[tid/pid]", "(msec)", "(msec)", "(msec)");
>  
>  	/*
> @@ -1804,6 +1821,9 @@ static void timehist_header(void)
>  	 */
>  	printf("%.15s %.6s ", graph_dotted_line, graph_dotted_line);
>  
> +	if (sched->show_cpu_visual)
> +		printf(" %.*s ", ncpus, graph_dotted_line);
> +
>  	printf(" %.20s  %.9s  %.9s  %.9s",
>  		graph_dotted_line, graph_dotted_line, graph_dotted_line,
>  		graph_dotted_line);
> @@ -1817,11 +1837,28 @@ static void timehist_print_sample(struct perf_sched *sched,
>  				  struct thread *thread)
>  {
>  	struct thread_runtime *tr = thread__priv(thread);
> +	u32 max_cpus = sched->max_cpu + 1;
>  	char tstr[64];
>  
>  	timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
>  	printf("%15s [%04d] ", tstr, sample->cpu);
>  
> +	if (sched->show_cpu_visual) {
> +		u32 i;
> +		char c;
> +
> +		printf(" ");
> +		for (i = 0; i < max_cpus; ++i) {
> +			/* flag idle times with 'i'; others are sched events */
> +			if (i == sample->cpu)
> +				c = (thread->tid == 0) ? 'i' : 's';
> +			else
> +				c = ' ';
> +			printf("%c", c);
> +		}
> +		printf(" ");
> +	}
> +
>  	printf(" %-*s ", comm_width, timehist_get_commstr(thread));
>  
>  	print_sched_time(tr->dt_wait, 6);
> @@ -2095,6 +2132,8 @@ static void timehist_print_wakeup_event(struct perf_sched *sched,
>  
>  	timestamp__scnprintf_usec(sample->time, tstr, sizeof(tstr));
>  	printf("%15s [%04d] ", tstr, sample->cpu);
> +	if (sched->show_cpu_visual)
> +		printf(" %*s ", sched->max_cpu + 1, "");
>  
>  	printf(" %-*s ", comm_width, timehist_get_commstr(thread));
>  
> @@ -2458,7 +2497,7 @@ static int perf_sched__timehist(struct perf_sched *sched)
>  		sched->summary = sched->summary_only;
>  
>  	if (!sched->summary_only)
> -		timehist_header();
> +		timehist_header(sched);
>  
>  	err = perf_session__process_events(session);
>  	if (err) {
> @@ -2842,6 +2881,7 @@ int cmd_sched(int argc, const char **argv, const char *prefix __maybe_unused)
>  	OPT_BOOLEAN('S', "with-summary", &sched.summary,
>  		    "Show all syscalls and summary with statistics"),
>  	OPT_BOOLEAN('w', "wakeups", &sched.show_wakeups, "Show wakeup events"),
> +	OPT_BOOLEAN('V', "cpu-visual", &sched.show_cpu_visual, "Add CPU visual"),
>  	OPT_PARENT(sched_options)
>  	};
>  
> -- 
> 2.10.1