linux-kernel - Re: [PATCH v2 2/2] cgroups: add an nproc subsystem

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Message-ID: <20150309023427.GB13283@htj.duckdns.org>
Date:	Sun, 8 Mar 2015 22:34:27 -0400
From:	Tejun Heo <tj@...nel.org>
To:	Zefan Li <lizefan@...wei.com>
Cc:	Aleksa Sarai <cyphar@...har.com>, mingo@...hat.com,
	peterz@...radead.org, richard@....at, fweisbec@...il.com,
	linux-kernel@...r.kernel.org, cgroups@...r.kernel.org
Subject: Re: [PATCH v2 2/2] cgroups: add an nproc subsystem

Hello, Li.

On Mon, Mar 09, 2015 at 09:49:45AM +0800, Zefan Li wrote:
> Seems we are going to accept this feature. Is it because kmemcg won't be able
> to fullfill this requirement? And that's because kmemcg can only and will only

Yeah, pretty much.

> be able to control global kernel memory usage? 

I'm not sure what you mean by global kernel memory usage.

> I thought there will be some control file like kmem.pids.max, which will
> translate the number of processes to the kernel memory needed, and fail memory
> allocation if we reach the limit, for example make task_struct slab return
> NULL.

Hmm... I don't think so.  memcg will only be concerned with actual
memory in bytes.

Thanks.

-- 
tejun
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