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

[Namhyung Kim <namhyung@kernel.org>]

On Tue, Nov 22, 2016 at 03:33:26PM -0300, Arnaldo Carvalho de Melo wrote:
> Em Wed, Nov 16, 2016 at 03:06:33PM +0900, Namhyung Kim escreveu:
> > From: David Ahern <dsahern@gmail.com>
> > 
> > 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.

The documentation of sched timehist command (including the -V option)
comes with the next patch (8/8).

Thanks,
Namhyung


> 
> - Arnaldo
>  
> > Signed-off-by: David Ahern <dsahern@gmail.com>
> > Signed-off-by: Namhyung Kim <namhyung@kernel.org>
> > ---
> >  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