linux-kernel - Re: [PATCH v5] fs: add predicts based on nd->depth

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Message-ID: <20251125-palladium-edelmut-2e853325c3d9@brauner>
Date: Tue, 25 Nov 2025 10:04:11 +0100
From: Christian Brauner <brauner@...nel.org>
To: Mateusz Guzik <mjguzik@...il.com>
Cc: Christian Brauner <brauner@...nel.org>,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	viro@...iv.linux.org.uk
Subject: Re: [PATCH v5] fs: add predicts based on nd->depth

On Wed, 19 Nov 2025 15:29:54 +0100, Mateusz Guzik wrote:
> Stats from nd->depth usage during the venerable kernel build collected like so:
> bpftrace -e 'kprobe:terminate_walk,kprobe:walk_component,kprobe:legitimize_links
> { @[probe] = lhist(((struct nameidata *)arg0)->depth, 0, 8, 1); }'
> 
> @[kprobe:legitimize_links]:
> [0, 1)           6554906 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@|
> [1, 2)              3534 |                                                    |
> 
> [...]

Applied to the vfs-6.19.misc branch of the vfs/vfs.git tree.
Patches in the vfs-6.19.misc branch should appear in linux-next soon.

Please report any outstanding bugs that were missed during review in a
new review to the original patch series allowing us to drop it.

It's encouraged to provide Acked-bys and Reviewed-bys even though the
patch has now been applied. If possible patch trailers will be updated.

Note that commit hashes shown below are subject to change due to rebase,
trailer updates or similar. If in doubt, please check the listed branch.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs-6.19.misc

[1/1] fs: add predicts based on nd->depth
      https://git.kernel.org/vfs/vfs/c/7c179096e77e