linux-kernel - Re: [PATCH v12 4/8] mm: rust: add lock_vma_under

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Message-ID: <87tt9td4yl.fsf@kernel.org>
Date: Mon, 20 Jan 2025 13:50:42 +0100
From: Andreas Hindborg <a.hindborg@...nel.org>
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>,  "Gary Guo" <gary@...yguo.net>,  Björn Roy Baron
 <bjorn3_gh@...tonmail.com>,  "Benno Lossin" <benno.lossin@...ton.me>,
  "Trevor Gross" <tmgross@...ch.edu>,  <linux-kernel@...r.kernel.org>,
  <linux-mm@...ck.org>,  <rust-for-linux@...r.kernel.org>
Subject: Re: [PATCH v12 4/8] mm: rust: add lock_vma_under_rcu

"Alice Ryhl" <aliceryhl@...gle.com> writes:

> 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> (for mm bits)
> Reviewed-by: Jann Horn <jannh@...gle.com>
> Signed-off-by: Alice Ryhl <aliceryhl@...gle.com>

Reviewed-by: Andreas Hindborg <a.hindborg@...nel.org>

Best regards,
Andreas Hindborg