linux-kernel - Re: [PATCH 2/2] rust: alloc: take the allocator into account for FOREIGN

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Message-Id: <DBCRNDVHJB6Q.1OJRPHLWAA16P@kernel.org>
Date: Tue, 15 Jul 2025 18:23:34 +0200
From: "Danilo Krummrich" <dakr@...nel.org>
To: "Benno Lossin" <lossin@...nel.org>
Cc: "Alice Ryhl" <aliceryhl@...gle.com>, "Lorenzo Stoakes"
 <lorenzo.stoakes@...cle.com>, "Liam R. Howlett" <Liam.Howlett@...cle.com>,
 "Andrew Morton" <akpm@...ux-foundation.org>, "Matthew Wilcox"
 <willy@...radead.org>, "Tamir Duberstein" <tamird@...il.com>, "Andreas
 Hindborg" <a.hindborg@...nel.org>, "Miguel Ojeda" <ojeda@...nel.org>,
 "Boqun Feng" <boqun.feng@...il.com>, "Gary Guo" <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>, "Trevor Gross"
 <tmgross@...ch.edu>, <linux-mm@...ck.org>,
 <rust-for-linux@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] rust: alloc: take the allocator into account for
 FOREIGN_ALIGN

On Tue Jul 15, 2025 at 6:00 PM CEST, Benno Lossin wrote:
> Do we at some point also want to give people the option to use vmalloc
> for `Arc`?

I'm not sure how useful that is. Typically, larger allocations (e.g. buffers)
are members of smaller reference counted objects that manage their lifetime,
etc.