Re: [PATCH] mm, memcg: cg2 memory{.swap,}.peak write handlers

[Tejun Heo <tj@kernel.org>]

On Wed, Jul 17, 2024 at 07:48:40PM -0400, Waiman Long wrote:
...
> How about letting .peak shows two numbers? The first one is the peak since
> the creation of the cgroup and cannot be reset. The second one is a local
> maximum that can be reset to 0. We just to keep track of one more counter
> that should be simple enough to implement.

What Johannes suggested seems to hit all the marks - it's efficient and
relatively simple, the overhead is only on the users of the facility, and
flexible in a straightforward manner. I have a hard time buying the argument
that it's more difficult to use - the benefit to cost ratio seems pretty
clear. Given that, I'm not sure why we'd want to add something fishy that
can lead to longterm problems.

Thanks.

-- 
tejun