linux-kernel - Re: [PATCH 3/3] perf tools: Clarify the output of perf sched map.

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Date:	Mon, 5 May 2014 20:24:33 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Dongsheng Yang <yangds.fnst@...fujitsu.com>
Cc:	a.p.zijlstra@...llo.nl, paulus@...ba.org, mingo@...hat.com,
	acme@...nel.org, linux-kernel@...r.kernel.org,
	David Ahern <dsahern@...il.com>
Subject: Re: [PATCH 3/3] perf tools: Clarify the output of perf sched map.

On Mon, May 05, 2014 at 04:05:55PM +0900, Dongsheng Yang wrote:
> From: Dongsheng <yangds.fnst@...fujitsu.com>
> 
> In output of perf sched map, any shortname of thread will be explained
> at the first time when it appear.
> 
> Example:
> 	      *A0       228836.978985 secs A0 => perf:23032
>           *.   A0       228836.979016 secs B0 => swapper:0
>            .  *C0       228836.979099 secs C0 => migration/3:22
>   *A0      .   C0       228836.979115 secs
>    A0      .  *.        228836.979115 secs
> 
> But B0, which is explained as swapper:0 did not appear in the
> left part of output. Instead, we use '.' as the shortname of
> swapper:0. So the comment of "B0 => swapper:0" is not easy to
> understand.
> 
> This patch clarify the output of perf sched map with not allocating
> one letter-number shortname for swapper:0 and print ". => swapper:0"
> as the explaination for swapper:0.
> 
> Example:
>               *A0       228836.978985 secs A0 => perf:23032
>           * .  A0       228836.979016 secs . => swapper:0
>             . *B0       228836.979099 secs B0 => migration/3:22
>   *A0       .  B0       228836.979115 secs
>    A0       . * .       228836.979115 secs
>    A0     *C0   .       228836.979225 secs C0 => ksoftirqd/2:18
>    A0     *D0   .       228836.979236 secs D0 => rcu_sched:7

I've never used 'perf sched map' before, so I'm not
sure about this one.. Arnaldo, David, Ingo?  ;-)

thanks,
jirka

> 
> Signed-off-by: Dongsheng <yangds.fnst@...fujitsu.com>
> ---
>  tools/perf/builtin-sched.c | 35 +++++++++++++++++++----------------
>  1 file changed, 19 insertions(+), 16 deletions(-)
> 
> diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
> index 4f0dd21..c2bf8f2 100644
> --- a/tools/perf/builtin-sched.c
> +++ b/tools/perf/builtin-sched.c
> @@ -1300,17 +1300,23 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
>  
>  	new_shortname = 0;
>  	if (!sched_in->shortname[0]) {
> -		sched_in->shortname[0] = sched->next_shortname1;
> -		sched_in->shortname[1] = sched->next_shortname2;
> -
> -		if (sched->next_shortname1 < 'Z') {
> -			sched->next_shortname1++;
> -		} else {
> -			sched->next_shortname1='A';
> -			if (sched->next_shortname2 < '9') {
> -				sched->next_shortname2++;
> +		if (!strcmp(thread__comm_str(sched_in), "swapper")) {
> +			sched_in->shortname[0] = '.';
> +			sched_in->shortname[1] = '\0';
> +		}
> +		else {
> +			sched_in->shortname[0] = sched->next_shortname1;
> +			sched_in->shortname[1] = sched->next_shortname2;
> +
> +			if (sched->next_shortname1 < 'Z') {
> +				sched->next_shortname1++;
>  			} else {
> -				sched->next_shortname2='0';
> +				sched->next_shortname1='A';
> +				if (sched->next_shortname2 < '9') {
> +					sched->next_shortname2++;
> +				} else {
> +					sched->next_shortname2='0';
> +				}
>  			}
>  		}
>  		new_shortname = 1;
> @@ -1322,12 +1328,9 @@ static int map_switch_event(struct perf_sched *sched, struct perf_evsel *evsel,
>  		else
>  			printf("*");
>  
> -		if (sched->curr_thread[cpu]) {
> -			if (sched->curr_thread[cpu]->tid)
> -				printf("%2s ", sched->curr_thread[cpu]->shortname);
> -			else
> -				printf(".  ");
> -		} else
> +		if (sched->curr_thread[cpu])
> +			printf("%2s ", sched->curr_thread[cpu]->shortname);
> +		else
>  			printf("   ");
>  	}
>  
> -- 
> 1.8.2.1
> 
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