linux-kernel - Re: Change in functionality of futex() system call.

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Message-ID: <20110607183044.GA1603@noexit.corp.google.com>
Date:	Tue, 7 Jun 2011 11:30:45 -0700
From:	Joel Becker <jlbec@...lplan.org>
To:	Eric Dumazet <eric.dumazet@...il.com>
Cc:	Darren Hart <dvhart@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	David Oliver <david@...advisors.com>,
	linux-kernel@...r.kernel.org,
	Shawn Bohrer <sbohrer@...advisors.com>,
	Zachary Vonler <zvonler@...advisors.com>,
	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
	Hugh Dickins <hughd@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>
Subject: Re: Change in functionality of futex() system call.

On Mon, Jun 06, 2011 at 08:11:38PM +0200, Eric Dumazet wrote:
> Le lundi 06 juin 2011 à 10:53 -0700, Darren Hart a écrit :
> > 
> 
> > If I understand the problem correctly, RO private mapping really doesn't
> > make any sense and we should probably explicitly not support it, while
> > special casing the RO shared mapping in support of David's scenario.
> > 
> 
> We supported them in 2.6.18 kernels, apparently. This might sounds
> stupid but who knows ?

	Trying to come up with a strawman for this sort of operation.
What about a process that creates a private mapping and then creates
threads with CLONE_VM?  Would we CoW in that case?

Joel

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