From: Boqun Feng <boqun.feng@gmail.com>
To: Alice Ryhl <aliceryhl@google.com>
Cc: "Paul E. McKenney" <paulmck@kernel.org>,
"Liam R. Howlett" <Liam.Howlett@oracle.com>,
"Gary Guo" <gary@garyguo.net>, "Miguel Ojeda" <ojeda@kernel.org>,
"Björn Roy Baron" <bjorn3_gh@protonmail.com>,
"Benno Lossin" <lossin@kernel.org>,
"Andreas Hindborg" <a.hindborg@kernel.org>,
"Trevor Gross" <tmgross@umich.edu>,
"Danilo Krummrich" <dakr@kernel.org>,
"Frederic Weisbecker" <frederic@kernel.org>,
"Neeraj Upadhyay" <neeraj.upadhyay@kernel.org>,
"Joel Fernandes" <joelagnelf@nvidia.com>,
"Josh Triplett" <josh@joshtriplett.org>,
"Uladzislau Rezki" <urezki@gmail.com>,
"Steven Rostedt" <rostedt@goodmis.org>,
"Mathieu Desnoyers" <mathieu.desnoyers@efficios.com>,
"Lai Jiangshan" <jiangshanlai@gmail.com>,
Zqiang <qiang.zhang@linux.dev>,
"Andrew Ballance" <andrewjballance@gmail.com>,
linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org,
rcu@vger.kernel.org, maple-tree@lists.infradead.org,
linux-mm@kvack.org
Subject: Re: [PATCH RFC 0/2] rcu box container for Rust + maple tree load_rcu
Date: Sat, 17 Jan 2026 23:39:46 +0800 [thread overview]
Message-ID: <aWutQuJAaBXG2JY1@tardis-2.local> (raw)
In-Reply-To: <aWuXHkGZlMvr0uxD@tardis-2.local>
On Sat, Jan 17, 2026 at 10:05:18PM +0800, Boqun Feng wrote:
> On Sat, Jan 17, 2026 at 01:29:25PM +0000, Alice Ryhl wrote:
> > On Sat, Jan 17, 2026 at 09:11:49PM +0800, Boqun Feng wrote:
> > > In Rcu + RcuOld design, RcuBox is just a Box
> > > because these two pointer types handle reclaim + accesses.
> >
> > How would that work? Dropping my RcuBox<_> must use kfree_rcu() or
> > synchronize_rcu() or it is unsound. So it can't just be a Box.
> >
>
> RcuOld<P: ForeignOwnable> will call synchronize_rcu() before dropping
> `P`. And I think we can have an asynchronous drop pointer type like
> `RcuOld<P, Async>` that requires `P` is a type like `Box<HasRcuHead>`,
One blocker on that is Drop impls cannot be specialized. We probably
need a different pointer type like RcuOldAsync...
Regards,
Boqun
> and the drop of `RcuOld<Box<HasRcuHead>, Async>` would be `call_rcu()`
> or `kfree_rcu()`.
>
> Regards,
> Boqun
>
> > Alice
next prev parent reply other threads:[~2026-01-17 15:39 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-16 15:46 Alice Ryhl
2026-01-16 15:46 ` [PATCH RFC 1/2] rust: rcu: add RcuBox type Alice Ryhl
2026-01-16 16:23 ` Joel Fernandes
2026-01-16 15:46 ` [PATCH RFC 2/2] rust: maple_tree: add load_rcu() Alice Ryhl
2026-01-17 0:06 ` [PATCH RFC 0/2] rcu box container for Rust + maple tree load_rcu Boqun Feng
2026-01-17 11:55 ` Alice Ryhl
2026-01-17 12:11 ` Boqun Feng
2026-01-17 13:11 ` Boqun Feng
2026-01-17 13:29 ` Alice Ryhl
2026-01-17 14:05 ` Boqun Feng
2026-01-17 15:39 ` Boqun Feng [this message]
2026-01-17 16:46 ` Gary Guo
2026-01-17 13:12 ` Alice Ryhl
2026-01-17 14:00 ` Boqun Feng
2026-01-21 12:10 ` Alice Ryhl
2026-01-21 13:14 ` Boqun Feng
2026-01-21 13:21 ` Alice Ryhl
2026-01-21 18:38 ` Paul E. McKenney
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