linux-kernel - Re: [PATCH RFC 0/2] add nproc cgroup subsystem

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Message-ID: <20150228164353.GR3964@htj.duckdns.org>
Date:	Sat, 28 Feb 2015 11:43:53 -0500
From:	Tejun Heo <tj@...nel.org>
To:	Tim Hockin <thockin@...kin.org>
Cc:	Frederic Weisbecker <fweisbec@...il.com>,
	Austin S Hemmelgarn <ahferroin7@...il.com>,
	lizefan@...wei.com, richard@....at, mingo@...hat.com,
	Aleksa Sarai <cyphar@...har.com>, cgroups@...r.kernel.org,
	peterz@...radead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH RFC 0/2] add nproc cgroup subsystem

Hello, Tim.

On Sat, Feb 28, 2015 at 08:38:07AM -0800, Tim Hockin wrote:
> I know there is not much concern for legacy-system problems, but it is
> worth adding this case - there are systems that limit PIDs for other
> reasons, eg broken infrastructure that assumes PIDs fit in a short int,
> hypothetically.  Given such a system, PIDs become precious and limiting
> them per job is important.
>
> My main point being that there are less obvious considerations in play than
> just memory usage.

Sure, there are those cases but it'd be unwise to hinge long term
decisions on them.  It's hard to even argue 16bit pid in legacy code
as a significant contributing factor at this point.  At any rate, it
seems that pid is a global resource which needs to be provisioned for
reasonable isolation which is a good reason to consider controlling it
via cgroups.

Thanks.

-- 
tejun
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