linux-kernel - Re: [PATCH 1/3] mm, slab: deprecate SLAB_MEM

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Date: Fri, 23 Feb 2024 17:41:14 +0100
From: Vlastimil Babka <vbabka@...e.cz>
To: Chengming Zhou <chengming.zhou@...ux.dev>,
 "Song, Xiongwei" <Xiongwei.Song@...driver.com>,
 Roman Gushchin <roman.gushchin@...ux.dev>
Cc: 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>,
 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>,
 Zheng Yejian <zhengyejian1@...wei.com>,
 "linux-mm@...ck.org" <linux-mm@...ck.org>,
 "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
 "kasan-dev@...glegroups.com" <kasan-dev@...glegroups.com>,
 Steven Rostedt <rostedt@...dmis.org>
Subject: Re: [PATCH 1/3] mm, slab: deprecate SLAB_MEM_SPREAD flag

On 2/22/24 03:32, Chengming Zhou wrote:
> On 2024/2/22 09:10, Song, Xiongwei wrote:
>> Hi Vlastimil,
>> 
>>> On Tue, Feb 20, 2024 at 05:58:25PM +0100, Vlastimil Babka wrote:
>>> 0;95;0c> The SLAB_MEM_SPREAD flag used to be implemented in SLAB, which was
>>>> removed.  SLUB instead relies on the page allocator's NUMA policies.
>>>> Change the flag's value to 0 to free up the value it had, and mark it
>>>> for full removal once all users are gone.
>>>>
>>>> Reported-by: Steven Rostedt <rostedt@...dmis.org>
>>>> Closes: https://lore.kernel.org/all/20240131172027.10f64405@gandalf.local.home/
>>>> Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
>>>
>>> Reviewed-by: Roman Gushchin <roman.gushchin@...ux.dev>
>>>
>>> Do you plan to follow up with a patch series removing all usages?
>> 
>> If you are not available with it, I can do.
> 
> Actually, I have done it yesterday. Sorry, I just forgot this task. :)
> 
> I plan to send out it after this series merged in the slab branch. And
> I'm wondering is it better to put all diffs in one huge patch or split
> every diff to each patch?

I'd suggest you do a patch per subsystem (mostly different filesystems) and
send them out to respective maintainers to pick in their trees. I've talked
to David from btrfs and he suggested this way.

You don't need to wait for this series to be merged. The flag is already a
no-op as of 6.8-rc1. Also I'd suggest sending the patches individually. In a
series they wouldn't depend on each other anyway, and you would either have
to Cc maintainers separately per patch of the series, or everyone on
everything, and there would always be somebody who would prefer the other
way that you pick.

> Thanks!