On Fri, Nov 22, 2024 at 4:41 PM Alice Ryhl <aliceryhl@xxxxxxxxxx> 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@xxxxxxxxxx> (for mm bits) > Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx> Reviewed-by: Jann Horn <jannh@xxxxxxxxxx>
