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Date: Sun, 28 Sep 2025 16:47:42 +0200
Message-Id: <DD4IKU7O94WN.2VALE9M80XGQ7@kernel.org>
Subject: Re: [PATCH] rust: slab: add basic slab module
Cc: "Miguel Ojeda" <ojeda@kernel.org>, "Alex Gaynor"
 <alex.gaynor@gmail.com>, "Boqun Feng" <boqun.feng@gmail.com>, "Gary Guo"
 <gary@garyguo.net>, =?utf-8?q?Bj=C3=B6rn_Roy_Baron?=
 <bjorn3_gh@protonmail.com>, "Benno Lossin" <lossin@kernel.org>, "Andreas
 Hindborg" <a.hindborg@kernel.org>, "Alice Ryhl" <aliceryhl@google.com>,
 "Trevor Gross" <tmgross@umich.edu>, <rust-for-linux@vger.kernel.org>,
 <linux-kernel@vger.kernel.org>, "Lorenzo Stoakes"
 <lorenzo.stoakes@oracle.com>, "Vlastimil Babka" <vbabka@suse.cz>, "Liam R.
 Howlett" <Liam.Howlett@oracle.com>, "Uladzislau Rezki" <urezki@gmail.com>,
 <linux-mm@kvack.org>
To: "Elijah Wright" <git@elijahs.space>
From: "Danilo Krummrich" <dakr@kernel.org>
References: <20250924193643.4001-1-git@elijahs.space>
 <DD1SGLU4180C.361W5XLH76XNC@kernel.org>
In-Reply-To: <DD1SGLU4180C.361W5XLH76XNC@kernel.org>

On Thu Sep 25, 2025 at 11:54 AM CEST, Danilo Krummrich wrote:
>   (3) Implement a macro to generate a custom KmemCache Allocator trait
>       implementation for every KmemCache instance with a static lifetime.

Thinking about it a bit more, I think we should go with option (3) for now.

With its only limitation being that it always binds the lifetime of a kmemc=
ache
to the module lifetime, it still seems to be the best option, considering t=
hat
the alternatives require additional synchronization in hot paths, may *sile=
ntly*
leak the kmemcache, cause significant code duplication or break dynamic
dispatch.

Tieing the kmemcache to the module lifetime should cover the vast majority =
of
use-cases; should we ever really need something else we can still revisit t=
he
options.

Thanks,
Danilo