linux-kernel - Re: [PATCH] perf tools: Add -H short option for --hierarchy

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Message-ID: <CAM9d7ch7gnYMOc_nvy5neLdEhsjDZpr1=Obh-UW3=A14J_T68w@mail.gmail.com>
Date:   Sun, 5 Nov 2023 20:43:20 -0800
From:   Namhyung Kim <namhyung@...nel.org>
To:     Arnaldo Carvalho de Melo <acme@...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 tools: Add -H short option for --hierarchy

Hi Arnaldo,

On Thu, Oct 26, 2023 at 1:02 PM Arnaldo Carvalho de Melo
<acme@...nel.org> wrote:
>
> Em Thu, Oct 26, 2023 at 09:46:02AM +0300, Adrian Hunter escreveu:
> > On 26/10/23 09:26, Namhyung Kim wrote:
> > > I found the hierarchy mode useful, but it's easy to make a typo when
> > > using it.  Let's add a short option for that.
>
> > > Also update the documentation. :)
>
> > Perhaps it would also be possible to support bash-completions for
> > long options
>
> It works:
>
>   # . ~acme/git/linux/tools/perf/perf-completion.sh
>   # perf top --hi<TAB>
>   --hide_kernel_symbols  --hide_user_symbols    --hierarchy
>   #
>
> And:
>
> perf top --hie<ENTER>
>
> works as it is unambiguous (so far).

Thanks for the test!

>
> What we don't have is a way to use hierachy by default, i.e. we should
> have:
>
> perf config top.hierarchy=1
>
> and then:
>
> perf top
>
> would always use the hierarchy view.
>
> tools/perf/Documentation/perf-config.txt has the options that can be
> set, like:
>
> # perf report | head -15
> # To display the perf.data header info, please use --header/--header-only options.
> #
> #
> # Total Lost Samples: 0
> #
> # Samples: 373K of event 'cycles:P'
> # Event count (approx.): 205365133495
> #
> # Overhead  Command          Shared Object                                     Symbol
> # ........  ...............  .................    ...................................
> #
>      3.17%  MediaDe~hine #6  libc.so.6            [.] pthread_mutex_lock@@GLIBC_2.2.5
>      2.31%  swapper          [kernel.vmlinux]     [k] psi_group_change
>      1.87%  MediaSu~sor #10  libc.so.6            [.] pthread_mutex_lock@@GLIBC_2.2.5
>      1.84%  MediaSu~isor #7  libc.so.6            [.] pthread_mutex_lock@@GLIBC_2.2.5
> #
>
> Then:
>
> # perf config report.sort_order=dso
> # perf report | head -15
> # To display the perf.data header info, please use --header/--header-only options.
> #
> #
> # Total Lost Samples: 0
> #
> # Samples: 373K of event 'cycles:P'
> # Event count (approx.): 205365133495
> #
> # Overhead  Shared Object
> # ........  ..............................................
> #
>     59.52%  [kernel.vmlinux]
>     19.79%  libc.so.6
>      8.07%  libxul.so
>      5.25%  libopenh264.so.2.3.1
> #
>
> # cat ~/.perfconfig
> # this file is auto-generated.
> [report]
>         sort_order = dso
> [root@...e ~]# perf config report.sort_order
> report.sort_order=dso
> #
>
> Right now 'perf top' has only:
>
> static int perf_top_config(const char *var, const char *value, void *cb __maybe_unused)
> {
>         if (!strcmp(var, "top.call-graph")) {
>                 var = "call-graph.record-mode";
>                 return perf_default_config(var, value, cb);
>         }
>         if (!strcmp(var, "top.children")) {
>                 symbol_conf.cumulate_callchain = perf_config_bool(var, value);
>                 return 0;
>         }
>
>         return 0;
> }
>
> This would be similar to what was done for --no-children on:

Sure, I can add the config option later.  But it's not
compatible with some options that change the output
like --children and --fields.  Maybe it needs to handle
some kind of priority of settings for incompatible one.

Thanks,
Namhyung

>
> https://git.kernel.org/torvalds/c/104ac991bd821773cba6f262f97a4a752ed76dd5
>
> $ git show --pretty=full 104ac991bd821773cba6f262f97a4a752ed76dd5 | head -5
> commit 104ac991bd821773cba6f262f97a4a752ed76dd5
> Author: Namhyung Kim <namhyung@...nel.org>
> Commit: Jiri Olsa <jolsa@...nel.org>
>
>     perf top: Add top.children config option
>
> - Arnaldo