linux-kernel - Re: [PATCH 4/4] mm/slab: move slab merge from slab

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Date:   Tue, 21 Nov 2023 18:01:57 +0900
From:   Hyeonggon Yoo <42.hyeyoo@...il.com>
To:     sxwjean@...com
Cc:     cl@...ux.com, penberg@...nel.org, rientjes@...gle.com,
        iamjoonsoo.kim@....com, vbabka@...e.cz, roman.gushchin@...ux.dev,
        corbet@....net, linux-mm@...ck.org, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/4] mm/slab: move slab merge from slab_common.c to slub.c

On Mon, Nov 20, 2023 at 6:13 PM <sxwjean@...com> wrote:
>
> From: Xiongwei Song <xiongwei.song@...driver.com>
>
> Since slab allocator has been removed. There is no users about slab
> merge except slub. This commit is almost to revert
> commit 423c929cbbec ("mm/slab_common: commonize slab merge logic").
>
> Also change all prefix of slab merge related functions, variables and
> definitions from "slab/SLAB" to"slub/SLUB".
>
> Signed-off-by: Xiongwei Song <xiongwei.song@...driver.com>
> ---
>  mm/slab.h        |   3 --
>  mm/slab_common.c |  98 ----------------------------------------------
>  mm/slub.c        | 100 ++++++++++++++++++++++++++++++++++++++++++++++-
>  3 files changed, 99 insertions(+), 102 deletions(-)
[...]
> +/*
> + * Merge control. If this is set then no merging of slab caches will occur.
> + */
> +static bool slub_nomerge = !IS_ENABLED(CONFIG_SLAB_MERGE_DEFAULT);
> +
> +static int __init setup_slub_nomerge(char *str)
> +{
> +       slub_nomerge = true;
> +       return 1;
> +}
> +
> +static int __init setup_slub_merge(char *str)
> +{
> +       slub_nomerge = false;
> +       return 1;
> +}
> +
> +__setup_param("slub_nomerge", slub_nomerge, setup_slab_nomerge, 0);
> +__setup_param("slub_merge", slub_merge, setup_slab_merge, 0);

FYI This hunk breaks kernel builds:

In file included from ./include/linux/printk.h:6,
                 from ./include/asm-generic/bug.h:22,
                 from ./arch/x86/include/asm/bug.h:87,
                 from ./include/linux/bug.h:5,
                 from ./include/linux/mmdebug.h:5,
                 from ./include/linux/mm.h:6,
                 from mm/slub.c:13:
mm/slub.c:748:45: error: ‘setup_slab_nomerge’ undeclared here (not in
a function); did you mean ‘setup_slub_nomerge’?
  748 | __setup_param("slub_nomerge", slub_nomerge, setup_slab_nomerge, 0);
      |                                             ^~~~~~~~~~~~~~~~~~
./include/linux/init.h:340:32: note: in definition of macro ‘__setup_param’
  340 |   = { __setup_str_##unique_id, fn, early }
      |                                ^~
mm/slub.c:749:41: error: ‘setup_slab_merge’ undeclared here (not in a
function); did you mean ‘setup_slub_merge’?
  749 | __setup_param("slub_merge", slub_merge, setup_slab_merge, 0);
      |                                         ^~~~~~~~~~~~~~~~
./include/linux/init.h:340:32: note: in definition of macro ‘__setup_param’
  340 |   = { __setup_str_##unique_id, fn, early }
      |                                ^~
  CC      kernel/time/ntp.o
mm/slub.c:742:19: warning: ‘setup_slub_merge’ defined but not used
[-Wunused-function]
  742 | static int __init setup_slub_merge(char *str)
      |                   ^~~~~~~~~~~~~~~~
mm/slub.c:736:19: warning: ‘setup_slub_nomerge’ defined but not used
[-Wunused-function]
  736 | static int __init setup_slub_nomerge(char *str)
      |                   ^~~~~~~~~~~~~~~~~~