RE: Do we still need SLAB_MEM_SPREAD (and possibly others)?

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To: "Song, Xiongwei" <Xiongwei.Song@xxxxxxxxxxxxx>
Subject: RE: Do we still need SLAB_MEM_SPREAD (and possibly others)?
From: "Christoph Lameter (Ampere)" <cl@xxxxxxxxx>
Date: Mon, 5 Feb 2024 09:50:15 -0800 (PST)
Cc: Chengming Zhou <chengming.zhou@xxxxxxxxx>, Vlastimil Babka <vbabka@xxxxxxx>, Yosry Ahmed <yosryahmed@xxxxxxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, LKML <linux-kernel@xxxxxxxxxxxxxxx>, "linux-mm@xxxxxxxxx" <linux-mm@xxxxxxxxx>, Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Kees Cook <keescook@xxxxxxxxxxxx>, David Rientjes <rientjes@xxxxxxxxxx>, Hyeonggon Yoo <42.hyeyoo@xxxxxxxxx>, Chengming Zhou <zhouchengming@xxxxxxxxxxxxx>, Zheng Yejian <zhengyejian1@xxxxxxxxxx>
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References: <20240131172027.10f64405@gandalf.local.home> <CAJD7tkYCrFAXLey-WK8k1Nkt4SoUQ00GWNjU43HJgaLqycBm7Q@mail.gmail.com> <61af19ca-5f9a-40da-a04d-b04ed27b8754@suse.cz> <698633db-b066-4f75-b201-7b785819277b@linux.dev> <PH0PR11MB519280092AA66FAE6BB3FACEEC402@PH0PR11MB5192.namprd11.prod.outlook.com>

On Sun, 4 Feb 2024, Song, Xiongwei wrote:

Once SLAB_MEM_SPREAD is removed, IMO, cpuset.memory_spread_slab is useless.

SLAB_MEM_SPREAD does not do anything anymore. SLUB relies on the"spreading" via the page allocator memory policies instead of doing itsown like SLAB used to do.


What does FILE_SPREAD_SLAB do? Dont see anything there either.

References:
- Do we still need SLAB_MEM_SPREAD (and possibly others)?
  - From: Steven Rostedt
- Re: Do we still need SLAB_MEM_SPREAD (and possibly others)?
  - From: Yosry Ahmed
- Re: Do we still need SLAB_MEM_SPREAD (and possibly others)?
  - From: Vlastimil Babka
- Re: Do we still need SLAB_MEM_SPREAD (and possibly others)?
  - From: Chengming Zhou
- RE: Do we still need SLAB_MEM_SPREAD (and possibly others)?
  - From: Song, Xiongwei

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