linux-kernel - Re: [PATCH] perf script: Increase PID/TID width for output

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Date:   Thu, 1 Jun 2023 07:54:36 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     Namhyung Kim <namhyung@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...nel.org>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH] perf script: Increase PID/TID width for output

On 31/05/23 23:32, Namhyung Kim wrote:
> On large systems, it's common that PID/TID is bigger than 5-digit and it
> makes the output unaligned.  Let's increase the width to 7.

Might be worth noting that currently the biggest PID_MAX_LIMIT
is 2^22 so pids don't get bigger than 7 digits presently.

> 
> Before:
> 
>   $ perf script
>   ...
>            swapper     0 [006] 1540823.803935:    1369324 cycles:P:  ffffffff9c755588 ktime_get+0x18 ([kernel.kallsyms])
>        gvfsd-dnssd 95114 [004] 1540823.804164:    1643871 cycles:P:  ffffffff9cfdca5c __get_user_8+0x1c ([kernel.kallsyms])
>          perf-exec 1558582 [000] 1540823.804209:    1018714 cycles:P:  ffffffff9c924ab9 __slab_free+0x9 ([kernel.kallsyms])
>              nmcli 1558589 [007] 1540823.804384:    1859212 cycles:P:      7f70537a8ad8 __strchrnul_evex+0x18 (/usr/lib/x86_64-linux-gnu/libc.so.6>
>              sleep 1558582 [000] 1540823.804456:     987425 cycles:P:      7fd35bb27b30 _dl_init+0x0 (/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2>
>        dbus-daemon  3043 [003] 1540823.804575:    1564465 cycles:P:  ffffffff9cb2bb70 llist_add_batch+0x0 ([kernel.kallsyms])
>              gdbus 1558592 [001] 1540823.804766:    1315219 cycles:P:  ffffffff9c797b2e audit_filter_syscall+0x9e ([kernel.kallsyms])
>     NetworkManager  3452 [005] 1540823.805301:    1558782 cycles:P:      7fa957737748 g_bit_lock+0x58 (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7400.5>
> 
> After:
> 
>   $ perf script
>   ...
>            swapper       0 [006] 1540823.803935:    1369324 cycles:P:  ffffffff9c755588 ktime_get+0x18 ([kernel.kallsyms])
>        gvfsd-dnssd   95114 [004] 1540823.804164:    1643871 cycles:P:  ffffffff9cfdca5c __get_user_8+0x1c ([kernel.kallsyms])
>          perf-exec 1558582 [000] 1540823.804209:    1018714 cycles:P:  ffffffff9c924ab9 __slab_free+0x9 ([kernel.kallsyms])
>              nmcli 1558589 [007] 1540823.804384:    1859212 cycles:P:      7f70537a8ad8 __strchrnul_evex+0x18 (/usr/lib/x86_64-linux-gnu/libc.so.6>
>              sleep 1558582 [000] 1540823.804456:     987425 cycles:P:      7fd35bb27b30 _dl_init+0x0 (/usr/lib/x86_64-linux-gnu/ld-linux-x86-64.so.2>
>        dbus-daemon    3043 [003] 1540823.804575:    1564465 cycles:P:  ffffffff9cb2bb70 llist_add_batch+0x0 ([kernel.kallsyms])
>              gdbus 1558592 [001] 1540823.804766:    1315219 cycles:P:  ffffffff9c797b2e audit_filter_syscall+0x9e ([kernel.kallsyms])
>     NetworkManager    3452 [005] 1540823.805301:    1558782 cycles:P:      7fa957737748 g_bit_lock+0x58 (/usr/lib/x86_64-linux-gnu/libglib-2.0.so.0.7400.5>
> 
> Signed-off-by: Namhyung Kim <namhyung@...nel.org>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
>  tools/perf/builtin-script.c | 6 +++---
>  1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
> index 029d5a597233..70549fc93b12 100644
> --- a/tools/perf/builtin-script.c
> +++ b/tools/perf/builtin-script.c
> @@ -801,11 +801,11 @@ static int perf_sample__fprintf_start(struct perf_script *script,
>  	}
>  
>  	if (PRINT_FIELD(PID) && PRINT_FIELD(TID))
> -		printed += fprintf(fp, "%5d/%-5d ", sample->pid, sample->tid);
> +		printed += fprintf(fp, "%7d/%-7d ", sample->pid, sample->tid);
>  	else if (PRINT_FIELD(PID))
> -		printed += fprintf(fp, "%5d ", sample->pid);
> +		printed += fprintf(fp, "%7d ", sample->pid);
>  	else if (PRINT_FIELD(TID))
> -		printed += fprintf(fp, "%5d ", sample->tid);
> +		printed += fprintf(fp, "%7d ", sample->tid);
>  
>  	if (PRINT_FIELD(CPU)) {
>  		if (latency_format)