Re: [PATCH 14/19] mm: Introduce a cgroup for pinned memory

[Jason Gunthorpe]

On Wed, Feb 22, 2023 at 10:38:25PM +1100, Alistair Popple wrote:
> When a driver unpins a page we scan the pinners list and assign
> ownership to the next driver pinning the page by updating memcg_data and
> removing the vm_account from the list.

I don't see how this works with just the data structure you outlined??
Every unique page needs its own list_head in the vm_account, it is
doable just incredibly costly.

Jason