linux-kernel - Re: A Plumber’s Wish List for Linux

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Date:	Fri, 7 Oct 2011 00:49:04 -0700
From:	Matt Helsley <matthltc@...ibm.com>
To:	Kay Sievers <kay.sievers@...y.org>
Cc:	linux-kernel@...r.kernel.org, lennart@...ttering.net,
	harald@...hat.com, david@...ar.dk, greg@...ah.com,
	Biederman Eric Biederman <ebiederm@...ssion.com>
Subject: Re: A Plumber’s Wish List for Linux

On Fri, Oct 07, 2011 at 01:17:02AM +0200, Kay Sievers wrote:

<snip>

> * simple, reliable and future-proof way to detect whether a specific pid
> is running in a CLONE_NEWPID container, i.e. not in the root PID
> namespace. Currently, there are available a few ugly hacks to detect

Is that precisely what's needed or would it be sufficient to know
that the pid is running in a child pid namespace of the current pid
namespace? If so, I think this could eventually be done by comparing
the inode numbers assigned to /proc/<pid>/ns/pid to those of
/proc/1/ns/pid.

> * Add a timerslack cgroup controller, to allow increasing the timer
> slack of user session cgroups when the machine is idle.

There were patches for a timerslack cgroup controller but for some
reason (I don't recall why) they stalled. It might be worth digging
through the containers mailing list archives.

Cheers,
	-Matt Helsley

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