linux-kernel - Re: pids controller fails to track zombie processes

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Message-ID: <CAOviyagshZQKzQb1aL4_YYNNKSMXMAGpEi7NPuZmKbhB3AUdFQ@mail.gmail.com>
Date:	Tue, 6 Oct 2015 05:42:53 +1100
From:	Aleksa Sarai <cyphar@...har.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: pids controller fails to track zombie processes

Hi Tejun,

> I noticed that the pids controller is uncharging from the task exit
> path; however, this isn't correct as zombie processes can linger on
> way after exit while holding pids.

Maybe try adding a callback on the wait() path and remove the exit()
callbacks for the controller? But I'm not sure if that's safe (can we
even call task_get_css() on a task that's being waited on?).

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