linux-kernel - Re: [PATCH v14 4/8] mm: rust: add lock_vma_under

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [day] [month] [year] [list]

Message-ID: <20250225162848.730a420e@eugeo>
Date: Tue, 25 Feb 2025 16:28:48 +0000
From: Gary Guo <gary@...yguo.net>
To: Alice Ryhl <aliceryhl@...gle.com>
Cc: Miguel Ojeda <ojeda@...nel.org>, Matthew Wilcox <willy@...radead.org>,
 Lorenzo Stoakes <lorenzo.stoakes@...cle.com>, Vlastimil Babka
 <vbabka@...e.cz>, John Hubbard <jhubbard@...dia.com>, "Liam R. Howlett"
 <Liam.Howlett@...cle.com>, Andrew Morton <akpm@...ux-foundation.org>, Greg
 Kroah-Hartman <gregkh@...uxfoundation.org>, Arnd Bergmann <arnd@...db.de>,
 Jann Horn <jannh@...gle.com>, Suren Baghdasaryan <surenb@...gle.com>, Alex
 Gaynor <alex.gaynor@...il.com>, Boqun Feng <boqun.feng@...il.com>, "
 Björn Roy Baron" <bjorn3_gh@...tonmail.com>, Benno Lossin
 <benno.lossin@...ton.me>, Andreas Hindborg <a.hindborg@...nel.org>, Trevor
 Gross <tmgross@...ch.edu>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, rust-for-linux@...r.kernel.org
Subject: Re: [PATCH v14 4/8] mm: rust: add lock_vma_under_rcu

On Thu, 13 Feb 2025 11:04:03 +0000
Alice Ryhl <aliceryhl@...gle.com> wrote:

> Currently, the binder driver always uses the mmap lock to make changes
> to its vma. Because the mmap lock is global to the process, this can
> involve significant contention. However, the kernel has a feature called
> per-vma locks, which can significantly reduce contention. For example,
> you can take a vma lock in parallel with an mmap write lock. This is
> important because contention on the mmap lock has been a long-term
> recurring challenge for the Binder driver.
> 
> This patch introduces support for using `lock_vma_under_rcu` from Rust.
> The Rust Binder driver will be able to use this to reduce contention on
> the mmap lock.
> 
> Acked-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
> Reviewed-by: Jann Horn <jannh@...gle.com>
> Reviewed-by: Andreas Hindborg <a.hindborg@...nel.org>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

Reviewed-by: Gary Guo <gary@...yguo.net>

> ---
>  rust/helpers/mm.c |  5 +++++
>  rust/kernel/mm.rs | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++