linux-kernel - Re: [PATCH 1/5] user_hooks: New user hooks subsystem

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Date:	Fri, 27 Jul 2012 18:58:29 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Alessio Igor Bogani <abogani@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Avi Kivity <avi@...hat.com>,
	Chris Metcalf <cmetcalf@...era.com>,
	Christoph Lameter <cl@...ux.com>,
	Geoff Levand <geoff@...radead.org>,
	Gilad Ben Yossef <gilad@...yossef.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...nel.org>,
	Kevin Hilman <khilman@...com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	Peter Zijlstra <peterz@...radead.org>,
	Stephen Hemminger <shemminger@...tta.com>,
	Steven Rostedt <rostedt@...dmis.org>,
	Sven-Thorsten Dietrich <thebigcorporation@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH 1/5] user_hooks: New user hooks subsystem

On Fri, Jul 27, 2012 at 09:40:54AM -0700, Paul E. McKenney wrote:
> On Fri, Jul 27, 2012 at 05:40:30PM +0200, Frederic Weisbecker wrote:
> > Create a new subsystem that handles the hooks on kernel/user
> > boundaries currently used by RCU for its userspace extended
> > quiescent state.
> > 
> > We need to pull this up from RCU into this new level of indirection
> > because these hooks are also going to be used to implement an "on
> > demand" generic virtual cputime accounting. A necessary step to
> > shutdown the tick while still accounting the cputime.
> 
> So this eliminates the case where the architecture might enter an
> RCU extended quiescent state multiple times, but exit it only once?
> (I am hoping that it does...)

Yeah. It should handle that.
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