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

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Date:	Thu, 14 Jun 2012 17:08:08 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
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 Thu, 14 Jun 2012, Paul E. McKenney wrote:
> On Thu, Jun 14, 2012 at 04:12:14PM +0200, Thomas Gleixner wrote:
> > > > Btw, if that simpler yield approach is working and I can't see why it
> > > > shouldn't then you can get rid of the node task as well. The only
> > > > purpose of it is to push up the priority of yielding tasks, right?
> > > 
> > > Ah, missed that it calls rcu_initiate_boost() as well....
> > 
> > And looking further, I really don't understand why it's doing
> > that. That node thread is only woken by these weird yield timers.
> 
> If your patch works out, it indeed might be possible to get rid of
> ->node_kthread_task.  The ->boost_kthread_task needs to stay, however.

That's right.
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