linux-kernel - Re: [PATCH v2 0/3] cleanup of SLAB

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Message-ID: <38f7952a-bee7-4a21-a89f-facff1803c41@suse.cz>
Date: Mon, 26 Feb 2024 10:11:38 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Christoph Lameter <cl@...ux.com>, Pekka Enberg <penberg@...nel.org>,
 David Rientjes <rientjes@...gle.com>, Joonsoo Kim <iamjoonsoo.kim@....com>,
 Andrew Morton <akpm@...ux-foundation.org>,
 Roman Gushchin <roman.gushchin@...ux.dev>,
 Hyeonggon Yoo <42.hyeyoo@...il.com>, Andrey Ryabinin
 <ryabinin.a.a@...il.com>, Alexander Potapenko <glider@...gle.com>,
 Andrey Konovalov <andreyknvl@...il.com>, Dmitry Vyukov <dvyukov@...gle.com>,
 Vincenzo Frascino <vincenzo.frascino@....com>
Cc: Zheng Yejian <zhengyejian1@...wei.com>,
 Xiongwei Song <xiongwei.song@...driver.com>,
 Chengming Zhou <chengming.zhou@...ux.dev>, linux-mm@...ck.org,
 linux-kernel@...r.kernel.org, kasan-dev@...glegroups.com,
 Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH v2 0/3] cleanup of SLAB_ flags

On 2/23/24 19:27, Vlastimil Babka wrote:
> This started by the report that SLAB_MEM_SPREAD flag is dead (Patch 1).
> Then in the alloc profiling series we realized it's too easy to reuse an
> existing SLAB_ flag's value when defining a new one, by mistake.
> Thus let the compiler do that for us via a new helper enum (Patch 2).
> When checking if more flags are dead or could be removed, didn't spot
> any, but found out the SLAB_KASAN handling of preventing cache merging
> can be simplified since we now have an explicit SLAB_NO_MERGE (Patch 3).
> 
> The SLAB_MEM_SPREAD flag is now marked as unused and for removal, and
> has a value of 0 so it's a no-op. Patches to remove its usage can/will
> be submitted to respective subsystems independently of this series - the
> flag is already dead as of v6.8-rc1 with SLAB removed. The removal of
> dead cpuset_do_slab_mem_spread() code can also be submitted
> independently.
> 
> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>

Pushed to slab/for-next

> ---
> Changes in v2:
> - Collect R-b, T-b (thanks!)
> - Unify all disabled flags's value to a sparse-happy zero with a new macro (lkp/sparse).
> - Rename __SF_BIT to __SLAB_FLAG_BIT (Roman Gushchin)
> - Rewrod kasan_cache_create() comment (Andrey Konovalov)
> - Link to v1: https://lore.kernel.org/r/20240220-slab-cleanup-flags-v1-0-e657e373944a@suse.cz
> 
> ---
> Vlastimil Babka (3):
>       mm, slab: deprecate SLAB_MEM_SPREAD flag
>       mm, slab: use an enum to define SLAB_ cache creation flags
>       mm, slab, kasan: replace kasan_never_merge() with SLAB_NO_MERGE
> 
>  include/linux/kasan.h |  6 ----
>  include/linux/slab.h  | 97 ++++++++++++++++++++++++++++++++++++---------------
>  mm/kasan/generic.c    | 22 ++++--------
>  mm/slab.h             |  1 -
>  mm/slab_common.c      |  2 +-
>  mm/slub.c             |  6 ++--
>  6 files changed, 79 insertions(+), 55 deletions(-)
> ---
> base-commit: 6613476e225e090cc9aad49be7fa504e290dd33d
> change-id: 20240219-slab-cleanup-flags-c864415ecc8e
> 
> Best regards,