linux-kernel - Re: [PATCH v2] slub: keep empty main sheaf as spare in __pcs_replace_empty

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Message-ID: <aWoB0/RxDZeK6LU0@intel.com>
Date: Fri, 16 Jan 2026 17:16:03 +0800
From: Zhao Liu <zhao1.liu@...el.com>
To: Hao Li <hao.li@...ux.dev>
Cc: Vlastimil Babka <vbabka@...e.cz>, Hao Li <haolee.swjtu@...il.com>,
	akpm@...ux-foundation.org, harry.yoo@...cle.com, cl@...two.org,
	rientjes@...gle.com, roman.gushchin@...ux.dev, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, tim.c.chen@...el.com,
	yu.c.chen@...el.com, zhao1.liu@...el.com
Subject: Re: [PATCH v2] slub: keep empty main sheaf as spare in
 __pcs_replace_empty_main()

> I'd like to dig a bit deeper to confirm whether the "256 tasks" result is truly
> a regression.

The "256" seems align closely with the NUMA topology on my machine, so
I'm unsure how it will perform on other machines.

> Could you please share the original full report, or let me know
> which test case under will-it-scale/ you used?

I mainly followed Suneeth's steps [*]:

1) git clone https://github.com/antonblanchard/will-it-scale.git
2) git clone https://github.com/intel/lkp-tests.git
3) cd will-it-scale && git apply 
lkp-tests/programs/will-it-scale/pkg/will-it-scale.patch
4) make
5) python3 runtest.py mmap2 25 process 0 0 1 8 64 128 192 256

[*]: https://lore.kernel.org/all/262c742f-dc0c-4adc-b23c-047cd3298a5e@amd.com/

Sine the raw perf.data files are too big to be blocked, if you need to
see any specific part of the content, I can paste the info for you.

Regards,
Zhao