linux-kernel - Re: [PATCH v2 0/2] kernfs: switch global locks to per-fs lock

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Message-ID: <20250420150244.127569-1-alexjlzheng@tencent.com>
Date: Sun, 20 Apr 2025 23:02:44 +0800
From: Jinliang Zheng <alexjlzheng@...il.com>
To: alexjlzheng@...il.com
Cc: alexjlzheng@...cent.com,
	gregkh@...uxfoundation.org,
	linux-kernel@...r.kernel.org,
	tj@...nel.org
Subject: Re: [PATCH v2 0/2] kernfs: switch global locks to per-fs lock

On Tue, 15 Apr 2025 23:36:57 +0800, Jinliang Zheng wrote:
> From: Jinliang Zheng <alexjlzheng@...cent.com>
> 
> The kernfs implementation has big lock granularity so every kernfs-based
> (e.g., sysfs, cgroup) fs are able to compete the locks. This patchset
> switches the global locks to per-fs locks.
> 
> In fact, the implementation of global locks has not yet introduced
> performance issues. But in the long run, more and more file systems will
> be implemented based on the kernfs framework, so this optimization is
> meaningful.
> 
> There are three global locks now, kernfs_idr_lock, kernfs_rename_lock
> and kernfs_pr_cont_lock. We only switch kernfs_idr_lock and
> kernfs_rename_lock here, because kernfs_pr_cont_lock is on a cold path.
> 
> Changelog:
> v2: Only switch kernfs_idr_lock and kernfs_rename_lock to per-fs
> v1: https://lore.kernel.org/all/20250411183109.6334-1-alexjlzheng@tencent.com/
> 
> Jinliang Zheng (2):
>   kernfs: switch global kernfs_idr_lock to per-fs lock
>   kernfs: switch global kernfs_rename_lock to per-fs lock
> 
>  fs/kernfs/dir.c             | 28 +++++++++++++++-------------
>  fs/kernfs/kernfs-internal.h | 16 ++++++++++++----
>  2 files changed, 27 insertions(+), 17 deletions(-)

Ding Dong ~

thanks,
Jinliang Zheng. :)

> 
> -- 
> 2.49.0