On Fri, Aug 8, 2025 at 8:29 AM Suren Baghdasaryan <surenb@xxxxxxxxxx> wrote: > > Utilize per-vma locks to stabilize vma after lookup without taking > mmap_lock during PROCMAP_QUERY ioctl execution. If vma lock is > contended, we fall back to mmap_lock but take it only momentarily > to lock the vma and release the mmap_lock. In a very unlikely case > of vm_refcnt overflow, this fall back path will fail and ioctl is > done under mmap_lock protection. > > This change is designed to reduce mmap_lock contention and prevent > PROCMAP_QUERY ioctl calls from blocking address space updates. > > Signed-off-by: Suren Baghdasaryan <surenb@xxxxxxxxxx> > Acked-by: SeongJae Park <sj@xxxxxxxxxx> > --- > fs/proc/task_mmu.c | 103 +++++++++++++++++++++++++++++++++++++-------- > 1 file changed, 85 insertions(+), 18 deletions(-) > LGTM Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx> [...]
