Re: [GIT PULL] MM updates for 6.4-rc1

[Linus Torvalds]

On Thu, Apr 27, 2023 at 3:33 PM Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> wrote:
>
> - Suren Baghdasaryan has improved mmap_lock scalability by switching to
>   per-VMA locking.

.. related to this, we have that new PER_VMA_LOCK_STATS config entry,
which is 'default y' and has basically no help test.

Please don't do that.

I don't think any of the VM debugging stuff should likely be 'default
y' in the first place, but if they are, they should most definitely
have a good *explanation* for why they should be on for a normal user.

                      Linus