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

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Message-ID: <ZHj/u9iXSeRfFg1e@kernel.org>
Date:   Thu, 1 Jun 2023 17:29:47 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>
Cc:     Adrian Hunter <adrian.hunter@...el.com>,
        Jiri Olsa <jolsa@...nel.org>, 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

Em Thu, Jun 01, 2023 at 09:14:50AM -0700, Namhyung Kim escreveu:
> Hi Adrian,
> 
> On Wed, May 31, 2023 at 9:54 PM Adrian Hunter <adrian.hunter@...el.com> wrote:
> >
> > 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.
> 
> Nice, will add that.

No need to resubmit, I'll add that.
 
> >
> > >
> > > 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>
> 
> Thanks for your review!

Indeed, thanks Adrian, Namhyung, applied.

- Arnaldo