Re: [PATCH 1/2] mm: memcg: switch to css_tryget() in get_mem_cgroup_from_mm()
From: Tejun Heo
Date: Thu Nov 07 2019 - 10:43:48 EST
Hello,
On Thu, Nov 07, 2019 at 01:21:25PM +0100, Michal Hocko wrote:
> Hmm, how can we have a task in an offline memcg? I thought that any
> existing task will prevent cgroup removal from proceeding. Is this some
> sort of race where the task managed to disassociate from the cgroup
> while there is still a binding to a memcg existing? What am I missing?
The previous cgroup one was from bsd process accounting which happens
after the process is marked head. This one IIUC is from core dumping
path.
Thanks.
--
tejun