linux-kernel - Re: [PATCH] bloat-o-meter: ignore __addressable

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Date:   Mon, 5 Nov 2018 16:40:27 +0200
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     Rasmus Villemoes <linux@...musvillemoes.dk>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Alexey Dobriyan <adobriyan@...il.com>,
        Ingo Molnar <mingo@...nel.org>,
        Dominik Brodowski <linux@...inikbrodowski.net>,
        Maninder Singh <maninder1.s@...sung.com>,
        Matteo Croce <mcroce@...hat.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bloat-o-meter: ignore __addressable_ symbols

On Fri, Nov 02, 2018 at 10:00:25PM +0100, Rasmus Villemoes wrote:
> Since __LINE__ is part of the symbol created by __ADDRESSABLE, almost
> any change causes those symbols to disappear and get reincarnated, e.g.
> 
> add/remove: 4/4 grow/shrink: 0/3 up/down: 32/-171 (-139)
> Function                                     old     new   delta
> __addressable_tracing_set_default_clock8649       -       8      +8
> __addressable_tracer_init_tracefs8631          -       8      +8
> __addressable_ftrace_dump8383                  -       8      +8
> __addressable_clear_boot_tracer8632            -       8      +8
> __addressable_tracing_set_default_clock8650       8       -      -8
> __addressable_tracer_init_tracefs8632          8       -      -8
> __addressable_ftrace_dump8384                  8       -      -8
> __addressable_clear_boot_tracer8633            8       -      -8
> trace_default_header                         663     642     -21
> tracing_mark_raw_write                       406     355     -51
> tracing_mark_write                           624     557     -67
> Total: Before=63889, After=63750, chg -0.22%
> 
> They're small and in .discard, so ignore them, leading to more useful
> 
> add/remove: 0/0 grow/shrink: 0/3 up/down: 0/-139 (-139)
> Function                                     old     new   delta
> trace_default_header                         663     642     -21
> tracing_mark_raw_write                       406     355     -51
> tracing_mark_write                           624     557     -67
> Total: Before=63721, After=63582, chg -0.22%

Useful!

FWIW,
Reviewed-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>

> 
> Signed-off-by: Rasmus Villemoes <linux@...musvillemoes.dk>
> ---
>  scripts/bloat-o-meter | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/scripts/bloat-o-meter b/scripts/bloat-o-meter
> index a923f05edb36..8c965f6a9881 100755
> --- a/scripts/bloat-o-meter
> +++ b/scripts/bloat-o-meter
> @@ -32,6 +32,7 @@ def getsizes(file, format):
>                  if name.startswith("__mod_"): continue
>                  if name.startswith("__se_sys"): continue
>                  if name.startswith("__se_compat_sys"): continue
> +                if name.startswith("__addressable_"): continue
>                  if name == "linux_banner": continue
>                  # statics and some other optimizations adds random .NUMBER
>                  name = re_NUMBER.sub('', name)
> -- 
> 2.19.1.6.gbde171bbf5
> 

-- 
With Best Regards,
Andy Shevchenko