linux-kernel - Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu hotplug threads

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Message-ID: <20120613191745.GG2427@linux.vnet.ibm.com>
Date:	Wed, 13 Jun 2012 12:17:45 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"Srivatsa S. Bhat" <srivatsa.bhat@...ux.vnet.ibm.com>,
	Rusty Russell <rusty@...tcorp.com.au>,
	Tejun Heo <tj@...nel.org>
Subject: Re: [RFC patch 2/5] smpboot: Provide infrastructure for percpu
 hotplug threads

On Wed, Jun 13, 2012 at 09:02:55PM +0200, Thomas Gleixner wrote:
> On Wed, 13 Jun 2012, Paul E. McKenney wrote:
> > On Wed, Jun 13, 2012 at 11:00:54AM -0000, Thomas Gleixner wrote:
> > >  	/* Now call notifier in preparation. */
> > >  	cpu_notify(CPU_ONLINE | mod, hcpu);
> > > +	smpboot_unpark_threads(cpu);
> > 
> > OK, RCU must use the lower-level interfaces, given that one of
> > then CPU_ONLINE notifiers might invoke synchronize_rcu().
> 
> We can start the threads before the notifiers. There is no
> restriction.

Sounds very good in both cases!

							Thanx, Paul

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