On Thu, 13 Feb 2025 11:04:03 +0000 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> > Reviewed-by: Jann Horn <jannh@xxxxxxxxxx> > Reviewed-by: Andreas Hindborg <a.hindborg@xxxxxxxxxx> > Signed-off-by: Alice Ryhl <aliceryhl@xxxxxxxxxx> Reviewed-by: Gary Guo <gary@xxxxxxxxxxx> > --- > rust/helpers/mm.c | 5 +++++ > rust/kernel/mm.rs | 60 +++++++++++++++++++++++++++++++++++++++++++++++++++++++
