Re: [PATCH v4 7/7] mm/maps: execute PROCMAP_QUERY ioctl under per-vma locks

[Andrii Nakryiko]

On Wed, Jun 4, 2025 at 4:12 PM Suren Baghdasaryan <surenb@xxxxxxxxxx> wrote:
>
> Utilize per-vma locks to stabilize vma after lookup without taking
> mmap_lock during PROCMAP_QUERY ioctl execution. While we might take
> mmap_lock for reading during contention, we do that momentarily only
> to lock the vma.
> 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>
> ---
>  fs/proc/task_mmu.c | 56 ++++++++++++++++++++++++++++++++++++----------
>  1 file changed, 44 insertions(+), 12 deletions(-)
>

The overall approach in this patch set looks good to me! PROCMAP_QUERY
changes specifically are pretty straightforward, nice. LGTM:

Acked-by: Andrii Nakryiko <andrii@xxxxxxxxxx>

And for the rest of the changes you seem to be in good hands, so I'll
just be waiting for the final thing to land, thanks for working on
this!