linux-kernel - Re: [PATCH 08/11] perf hist: Hide unused mem stat columns

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Message-ID: <aBTwQeO1RwS7_jLk@x1>
Date: Fri, 2 May 2025 13:18:09 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Namhyung Kim <namhyung@...nel.org>
Cc: Ian Rogers <irogers@...gle.com>, Kan Liang <kan.liang@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>, LKML <linux-kernel@...r.kernel.org>,
	linux-perf-users@...r.kernel.org,
	Ravi Bangoria <ravi.bangoria@....com>, Leo Yan <leo.yan@....com>
Subject: Re: [PATCH 08/11] perf hist: Hide unused mem stat columns

On Wed, Apr 30, 2025 at 01:55:45PM -0700, Namhyung Kim wrote:
> Some mem_stat types don't use all 8 columns.  And there are cases only
> samples in certain kinds of mem_stat types are available only.  For that
> case hide columns which has no samples.
> 
> The new output for the previous data would be:
> 
>   $ perf mem report -F overhead,op,comm --stdio
>   ...
>   #           ------ Mem Op -------
>   # Overhead     Load  Store  Other  Command
>   # ........  .....................  ...............
>   #
>       44.85%    21.1%  30.7%  48.3%  swapper
>       26.82%    98.8%   0.3%   0.9%  netsli-prober
>        7.19%    51.7%  13.7%  34.6%  perf
>        5.81%    89.7%   2.2%   8.1%  qemu-system-ppc
>        4.77%   100.0%   0.0%   0.0%  notifications_c
>        1.77%    95.9%   1.2%   3.0%  MemoryReleaser
>        0.77%    71.6%   4.1%  24.3%  DefaultEventMan
>        0.19%    66.7%  22.2%  11.1%  gnome-shell
>        ...
> 
> On Intel machines, the event is only for loads or stores so it'll have
> only one columns like below:
> 
>   #            Mem Op
>   # Overhead     Load  Command
>   # ........  .......  ...............
>   #
>       20.55%   100.0%  swapper
>       17.13%   100.0%  chrome
>        9.02%   100.0%  data-loop.0
>        6.26%   100.0%  pipewire-pulse
>        5.63%   100.0%  threaded-ml
>        5.47%   100.0%  GraphRunner
>        5.37%   100.0%  AudioIP~allback
>        5.30%   100.0%  Chrome_ChildIOT
>        3.17%   100.0%  Isolated Web Co
>        ...

  # grep "model name" -m1 /proc/cpuinfo
  model name    : AMD Ryzen 9 9950X3D 16-Core Processo
  # perf mem report -F overhead,op,comm --stdio
  # Total Lost Samples: 0
  #
  # Samples: 2K of event 'cycles:P'
  # Total weight : 2637
  # Sort order   : local_weight,mem,sym,dso,symbol_daddr,dso_daddr,snoop,tlb,locked,blocked,local_ins_lat,local_p_stage_cyc
  #
  #           ------ Mem Op -------
  # Overhead     Load  Store  Other  Command
  # ........  .....................  ...............
  #
      61.02%    14.4%  25.5%  60.1%  swapper
       5.61%    26.4%  13.5%  60.1%  Isolated Web Co
       5.50%    21.4%  29.7%  49.0%  perf
       4.74%    27.2%  15.2%  57.6%  gnome-shell
       4.63%    33.6%  11.5%  54.9%  mdns_service
       4.29%    28.3%  12.4%  59.3%  ptyxis
       2.16%    24.6%  19.3%  56.1%  DOM Worker
       0.99%    23.1%  34.6%  42.3%  firefox
       0.72%    26.3%  15.8%  57.9%  IPC I/O Parent
       0.61%    12.5%  12.5%  75.0%  kworker/u130:20
       0.61%    37.5%  18.8%  43.8%  podman
       0.57%    33.3%   6.7%  60.0%  Timer
       0.53%    14.3%   7.1%  78.6%  KMS thread
       0.49%    30.8%   7.7%  61.5%  kworker/u130:3-
       0.46%    41.7%  33.3%  25.0%  IPDL Background