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

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Date:   Thu, 26 Oct 2023 17:02:13 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Namhyung Kim <namhyung@...nel.org>,
        Adrian Hunter <adrian.hunter@...el.com>
Cc:     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

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).

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:

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