linux-kernel - Re: [RFC][PATCH 0/7] Clone PTS namespace

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Message-ID: <47FC138B.4070408@zytor.com>
Date:	Tue, 08 Apr 2008 17:53:31 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	sukadev@...ibm.com
CC:	linux-kernel@...r.kernel.org,
	Containers <containers@...ts.osdl.org>,
	Pavel Emelyanov <xemul@...nvz.org>, serue@...ibm.com,
	clg@...ibm.com
Subject: Re: [RFC][PATCH 0/7] Clone PTS namespace

sukadev@...ibm.com wrote:
> Devpts namespace patchset
> 
> In continuation of the implementation of containers in mainline, we need to
> support multiple PTY namespaces so that the PTY index (ie the tty names) in
> one container is independent of the PTY indices of other containers.  For
> instance this would allow each container to have a '/dev/pts/0' PTY and
> refer to different terminals.
> 

Why do we "need" this?  There isn't a fundamental need for this to be a 
dense numberspace (in fact, there are substantial reasons why it's a bad 
idea; the only reason the namespace is dense at the moment is because of 
the hideously bad handing of utmp in glibc.)  Other than indicies, this 
seems to be a more special case of device isolation across namespaces, 
would that be a more useful problem to solve across the board?

	hpa
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