linux-kernel - Re: [PATCH 2/3] mm/lru_gen: add configuration option to select debugfs/procfs for lru

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Message-ID: <040e35ca-848c-49cb-bd0c-f91f4a8e2c5d@infradead.org>
Date: Thu, 27 Nov 2025 20:33:19 -0800
From: Randy Dunlap <rdunlap@...radead.org>
To: Zicheng Wang <wangzicheng@...or.com>, akpm@...ux-foundation.org,
 hannes@...xchg.org, david@...hat.com, axelrasmussen@...gle.com,
 yuanchu@...gle.com
Cc: mhocko@...nel.org, zhengqi.arch@...edance.com, shakeel.butt@...ux.dev,
 lorenzo.stoakes@...cle.com, weixugc@...gle.com, Liam.Howlett@...cle.com,
 vbabka@...e.cz, rppt@...nel.org, surenb@...gle.com, mhocko@...e.com,
 corbet@....net, linux-mm@...ck.org, linux-doc@...r.kernel.org,
 linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/3] mm/lru_gen: add configuration option to select
 debugfs/procfs for lru_gen



On 11/27/25 6:53 PM, Zicheng Wang wrote:
> Signed-off-by: Zicheng Wang <wangzicheng@...or.com>
> ---
>  mm/Kconfig | 10 ++++++++++
>  1 file changed, 10 insertions(+)
> 
> diff --git a/mm/Kconfig b/mm/Kconfig
> index e443fe8cd..be7efa794 100644
> --- a/mm/Kconfig
> +++ b/mm/Kconfig
> @@ -1325,6 +1325,16 @@ config LRU_GEN_STATS
>  config LRU_GEN_WALKS_MMU
>  	def_bool y
>  	depends on LRU_GEN && ARCH_HAS_HW_PTE_YOUNG
> +
> +config LRU_GEN_PROCFS_CTRL
> +	bool "Move lru_gen files from debugfs to procfs"
> +	depends on LRU_GEN && PROC_FS
> +	help
> +	  Move lru_gen management from debugfs to procfs (/proc/lru_gen).
> +	  This production-ready feature provides critical memory reclaim
> +	  prediction and control. It is no longer experimental.
> +	  The migration ensures availability in commercial products where
> +	  debugfs may be disabled.

A. missing patch description
B. The help message above sounds like a patch description.

If someone does not enable this kconfig option, what happens?
a. lru_gen files stay in debugfs
b. lru_gen files are not present
c. something else. If so, what?


-- 
~Randy