Re: [PATCH 2/2] mm: move the high field from struct mem_cgroup to page_counter

Johannes Weiner
2018-04-20T20:54:50Z

On Fri, Apr 20, 2018 at 05:36:32PM +0100, Roman Gushchin wrote:
> We do store memory.min, memory.low and memory.max actual values
> in struct page_counter fields, while memory.high value is located
> in the struct mem_cgroup directly, which is not very consistent.
>
> This patch moves the high field from struct mem_cgroup to
> struct page_counter to simplify the code and make handling
> of all limits/boundaries clearer.

I would prefer not doing this.

Yes, it looks a bit neater if all these things are next to each other
in the struct, but on the other hand it separates the high variable
from high_work, and it adds an unnecessary setter function as well.

Plus, nothing in the page_counter code actually uses the value, it
really isn't part of that abstraction layer.