Re: [PATCH RFC v4 0/12] mm: use per-VMA lock in __access_remote_vm for improved monitoring reliability

[David Hildenbrand (Arm)]

On 7/25/26 00:29, Rik van Riel wrote:
> __access_remote_vm() holds mmap_read_lock() for the whole transfer. On
> large machines, with large multi-threaded applications, the mmap_lock
> is often contended, leading to things like reads of /proc/PID/cmdline
> stalling.
> 
> This results in system monitoring tools getting stuck, right when
> system information would be the most helpful.

Rik, what's the status of this, and which series do you consider more relevant:
the pure per-VMA lock change or the pure page-table walking + folio batching?

I'd assume the page-table walking would result in more speedup and the per-VMA
in mostly less contention. So likely we'd want the page-table walking
optimization first.

-- 
Cheers,

David