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

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Message-ID: <fb8161d9-16c0-da8c-09ee-905e39ae199b@linux.com>
Date: Mon, 5 Feb 2024 09:50:15 -0800 (PST)
From: "Christoph Lameter (Ampere)" <cl@...ux.com>
To: "Song, Xiongwei" <Xiongwei.Song@...driver.com>
cc: Chengming Zhou <chengming.zhou@...ux.dev>, 
    Vlastimil Babka <vbabka@...e.cz>, Yosry Ahmed <yosryahmed@...gle.com>, 
    Steven Rostedt <rostedt@...dmis.org>, LKML <linux-kernel@...r.kernel.org>, 
    "linux-mm@...ck.org" <linux-mm@...ck.org>, 
    Andrew Morton <akpm@...ux-foundation.org>, 
    Linus Torvalds <torvalds@...ux-foundation.org>, 
    Kees Cook <keescook@...omium.org>, David Rientjes <rientjes@...gle.com>, 
    Hyeonggon Yoo <42.hyeyoo@...il.com>, 
    Chengming Zhou <zhouchengming@...edance.com>, 
    Zheng Yejian <zhengyejian1@...wei.com>
Subject: RE: Do we still need SLAB_MEM_SPREAD (and possibly others)?

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 its 
own like SLAB used to do.

What does FILE_SPREAD_SLAB do? Dont see anything there either.