linux-kernel - Re: [RFC PATCH 2/2] rust: add maple tree abstractions

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Message-ID: <Z_1Tl1yd_5XNMsw2@cassiopeiae>
Date: Mon, 14 Apr 2025 20:27:35 +0200
From: Danilo Krummrich <dakr@...nel.org>
To: "Liam R. Howlett" <Liam.Howlett@...cle.com>,
	Andrew Ballance <andrewjballance@...il.com>, a.hindborg@...nel.org,
	akpm@...ux-foundation.org, alex.gaynor@...il.com,
	aliceryhl@...gle.com, benno.lossin@...ton.me,
	bjorn3_gh@...tonmail.com, boqun.feng@...il.com, brauner@...nel.org,
	dingxiangfei2009@...il.com, gary@...yguo.net,
	gregkh@...uxfoundation.org, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, maple-tree@...ts.infradead.org,
	ojeda@...nel.org, rust-for-linux@...r.kernel.org, tmgross@...ch.edu,
	wedsonaf@...il.com
Subject: Re: [RFC PATCH 2/2] rust: add maple tree abstractions

On Mon, Apr 07, 2025 at 09:36:35PM -0400, Liam R. Howlett wrote:
> No, I don't think it is worth having a rust implementation right now as
> there are no users and I could cause issues on the rust side without
> knowing.

I may have a user for this in the future, but we still need to investigate other
options for this.

If you remember, I'd have loved to use this for DRM GPUVM, but unfortunately
failed since we would need to be able to pre-allocate multiple new entries
upfront, before knowing any details about the entries and before modifying the
tree.

With nova-core we may get another option to use it as VRAM allocator. But as
mentioned, we're still investigating.

- Danilo