Re: [PATCH] mm: memcg: provide accurate stats for userspace reads

[Tejun Heo]

Hello,

On Mon, Aug 14, 2023 at 05:39:15PM -0700, Yosry Ahmed wrote:
> I believe dropping unified flushing, if possible of course, may fix
> both problems.

Yeah, flushing the whole tree for every stat read will push up the big O
complexity of the operation. It shouldn't be too bad because only what's
updated since the last read will need flushing but if you have a really big
machine with a lot of constantly active cgroups, you're still gonna feel it.
So, yeah, drop that and switch the global lock to mutex and we should all be
good?

Thanks.

-- 
tejun