Re: xarray breaks thrashing detection and cgroup isolation

[Matthew Wilcox]

On Thu, May 23, 2019 at 03:59:33PM -0400, Johannes Weiner wrote:
> My point is that we cannot have random drivers' internal data
> structures charge to and pin cgroups indefinitely just because they
> happen to do the modprobing or otherwise interact with the driver.
> 
> It makes no sense in terms of performance or cgroup semantics.

But according to Roman, you already have that problem with the page
cache.
https://lore.kernel.org/linux-mm/20190522222254.GA5700@castle/T/

So this argument doesn't make sense to me.