linux-kernel - Re: (subset) [PATCH 22/32] vfs: inode cache conversion to hash-bl

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Message-Id: <20230523-zujubeln-heizsysteme-f756eefe663e@brauner>
Date:   Tue, 23 May 2023 11:28:38 +0200
From:   Christian Brauner <brauner@...nel.org>
To:     Dave Chinner <dchinner@...hat.com>
Cc:     Christian Brauner <brauner@...nel.org>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-bcachefs@...r.kernel.org,
        Kent Overstreet <kent.overstreet@...ux.dev>,
        Alexander Viro <viro@...iv.linux.org.uk>
Subject: Re: (subset) [PATCH 22/32] vfs: inode cache conversion to hash-bl

On Tue, 09 May 2023 12:56:47 -0400, Kent Overstreet wrote:
> Because scalability of the global inode_hash_lock really, really
> sucks.
> 
> 32-way concurrent create on a couple of different filesystems
> before:
> 
> -   52.13%     0.04%  [kernel]            [k] ext4_create
>    - 52.09% ext4_create
>       - 41.03% __ext4_new_inode
>          - 29.92% insert_inode_locked
>             - 25.35% _raw_spin_lock
>                - do_raw_spin_lock
>                   - 24.97% __pv_queued_spin_lock_slowpath
> 
> [...]

This is interesting completely independent of bcachefs so we should give
it some testing.

I updated a few places that had outdated comments.

---

Applied to the vfs.unstable.inode-hash branch of the vfs/vfs.git tree.
Patches in the vfs.unstable.inode-hash 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.

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/vfs/vfs.git
branch: vfs.unstable.inode-hash

[22/32] vfs: inode cache conversion to hash-bl
        https://git.kernel.org/vfs/vfs/c/e3e92d47e6b1