linux-kernel - Re: [PATCH V2] cgroup: Introduce cgroup_detach

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Message-ID: <CA+qeAOq7hYq-TJMh8jQpJy=nWwk2FsUMSS1Hd=-JkhLLXbweEQ@mail.gmail.com>
Date:	Mon, 25 Aug 2014 22:46:03 +0800
From:	Dongsheng Yang <dongsheng081251@...il.com>
To:	Tejun Heo <tj@...nel.org>
Cc:	Dongsheng Yang <yangds.fnst@...fujitsu.com>, lizefan@...wei.com,
	cgroups@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH V2] cgroup: Introduce cgroup_detach_task().

Hi tj.

On Mon, Aug 25, 2014 at 10:12 PM, Tejun Heo <tj@...nel.org> wrote:
> On Mon, Aug 25, 2014 at 07:32:10PM +0800, Dongsheng Yang wrote:
>> Currently, the only method to detach a task from a cgroup is moving
>> it to others. It looks not natrual to me.
>
> Ummm... how is this different from moving it to the root cgroup?
> "just because" usually isn't a good enough rationale.
>

Thanx for your reply :).

My point here is that attaching and detaching are a pair of operations.
And the things involved in these operations should be a process
and a cgroup. But currently, when we want to detach a process from
a cgroup (A), we have to attach it to another cgroup (B). I think it is not
easy to understand. People would say: "Why I want to detach a process
from A, I have to care about another cgroup."

So I created this patch here wanting to make these operations more easy to
understand. And make attaching and detaching to be antonymous in action.

I think maybe we can use it in the Cgroup V2 which is in developing. :)

That's all my reason for this patch. But you could think it makes no sense.
It's okey to me.

Thanx

> Thanks.
>
> --
> tejun
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