Re: [PATCH 1/2] mm: memcg: switch to css_tryget() in get_mem_cgroup_from_mm()

Hello,

On Thu, Nov 14, 2019 at 08:16:57PM +0100, Michal Hocko wrote:

Then what is the point of this function and what about all other users?

It is useful for controlling admissions of new userspace visible uses - e.g. a tracepoint shouldn't be allowed to be attached to a cgroup which has already been deleted. We're just using it too liberally.

Thanks.