linux-kernel - Re: [PATCH] fs: switch timespec64 fields in inode to discrete integers

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Date: Tue, 21 May 2024 16:27:10 +0200
From: Christian Brauner <brauner@...nel.org>
To: Jeff Layton <jlayton@...nel.org>
Cc: Christian Brauner <brauner@...nel.org>,
	Jan Kara <jack@...e.cz>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-fsdevel@...r.kernel.org,
	Amir Goldstein <amir73il@...il.com>,
	linux-kernel@...r.kernel.org,
	Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: [PATCH] fs: switch timespec64 fields in inode to discrete integers

On Fri, 17 May 2024 20:08:40 -0400, Jeff Layton wrote:
> Adjacent struct timespec64's pack poorly. Switch them to discrete
> integer fields for the seconds and nanoseconds. This shaves 8 bytes off
> struct inode with a garden-variety Fedora Kconfig on x86_64, but that
> also moves the i_lock into the previous cacheline, away from the fields
> it protects.
> 
> To remedy that, move i_generation above the i_lock, which moves the new
> 4-byte hole to just after the i_fsnotify_mask in my setup. Amir has
> plans to use that to expand the i_fsnotify_mask, so add a comment to
> that effect as well.
> 
> [...]

Let's see what the performance bot thing has to say...

---

Applied to the vfs.misc branch of the vfs/vfs.git tree.
Patches in the vfs.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.misc

[1/1] fs: switch timespec64 fields in inode to discrete integers
      https://git.kernel.org/vfs/vfs/c/ad401d976810