linux-kernel - Re: [PATCH 1/3] change clone

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Message-ID: <20080410171453.GA7023@sergelap.ibm.com>
Date:	Thu, 10 Apr 2008 12:14:53 -0500
From:	"Serge E. Hallyn" <serue@...ibm.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	Cedric Le Goater <clg@...ibm.com>, sukadev@...ibm.com,
	Andrew Morton <akpm@...l.org>, serue@...ibm.com,
	"David C. Hansen" <haveblue@...ibm.com>,
	Pavel Emelyanov <xemul@...nvz.org>,
	Containers <containers@...ts.osdl.org>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/3] change clone_flags type to u64

Quoting Andi Kleen (andi@...stfloor.org):
> > I guess that was a development rationale. 
> 
> But what rationale? It just doesn't make much sense to me.
> 
> > Most of the namespaces are in 
> > use in the container projects like openvz, vserver and probably others 
> > and we needed a way to activate the code.
> 
> You could just have added it to feature groups over time.
> 
> > 
> > Not perfect I agree.
> >  
> > > With your current strategy are you sure that even 64bit will
> > > be enough in the end? For me it rather looks like you'll
> > > go through those quickly too as more and more of the kernel
> > > is namespaced.
> > 
> > well, we're reaching the end. I hope ! devpts is in progress and
> > mq is just waiting for a clone flag.
> 
> Are you sure?

Well for one thing we can take a somewhat different approach to new
clone flags.  I.e. we could extend CLONE_NEWIPC to do mq instead of
introducing a new clone flag.  The name doesn't have 'sysv' in it,
and globbing all ipc resources together makes some amount of sense.
Similarly has hpa+eric pointed out earlier, suka could use
CLONE_NEWDEV for ptys.  If we have net, pid, ipc, devices, that's a
pretty reasonable split imo.  Perhaps we tie user to devices and get
rid of CLONE_NEWUSER which I suspect noone is using atm (since only
Dave has run into the CONFIG_USER_SCHED problem).  Or not.  We could
roll uts into net, and give CLONE_NEWUTS a deprecation period.

-serge
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