linux-kernel - Re: [PATCH 14/14] cgroup: add cgroup_subsys->free() method and use it to fix pids controller

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Message-ID: <CAOviyaj_xi1h0m1Os6FjR4DTY-qs049eGauJUL6nhbfeaaZk8w@mail.gmail.com>
Date:	Mon, 12 Oct 2015 21:29:14 +1100
From:	Aleksa Sarai <cyphar@...har.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	lizefan@...wei.com, hannes@...xchg.org, cgroups@...r.kernel.org,
	linux-kernel@...r.kernel.org, kernel-team@...com
Subject: Re: [PATCH 14/14] cgroup: add cgroup_subsys->free() method and use it
 to fix pids controller

> pids controller is completely broken in that it uncharges when a task
> exits allowing zombies to escape resource control.  With the recent
> updates, cgroup core now maintains cgroup association till task free
> and pids controller can be fixed by uncharging on free instead of
> exit.

Looks good to me. Out of interest, is there any reason why we still
have ->exit(), given the zombie process edge case? Surely the zombie
process edge case would cause issues with kmemcg and similar
controllers, if they use ->exit() and not ->free()?

-- 
Aleksa Sarai (cyphar)
www.cyphar.com
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