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

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Message-ID: <7b24d6e38c9e46c4ae98211d5a815eb2@honor.com>
Date: Fri, 28 Nov 2025 07:19:00 +0000
From: wangzicheng <wangzicheng@...or.com>
To: Randy Dunlap <rdunlap@...radead.org>, "akpm@...ux-foundation.org"
	<akpm@...ux-foundation.org>, "hannes@...xchg.org" <hannes@...xchg.org>,
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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.
> 

Thanks for the comments, will be fix in the next version.

> 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

Regard to the questions,
If this Kconfig option is enabled, the `lru_gen` and `lru_gen_full` files will appear under /proc/.
If it is not enabled, the files remain under debugfs, which is the current default behavior.

Thanks,
Zicheng