linux-kernel - Re: [PATCH tip/core/rcu 03/23] rcu: Move RCU grace-period cleanup into kthread

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Message-ID: <20120906172912.GJ2448@linux.vnet.ibm.com>
Date:	Thu, 6 Sep 2012 10:29:13 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu, patches@...aro.org
Subject: Re: [PATCH tip/core/rcu 03/23] rcu: Move RCU grace-period cleanup
 into kthread

On Thu, Sep 06, 2012 at 03:34:38PM +0200, Peter Zijlstra wrote:
> On Thu, 2012-08-30 at 11:18 -0700, Paul E. McKenney wrote:
> >  static void rcu_report_qs_rsp(struct rcu_state *rsp, unsigned long flags)
> >         __releases(rcu_get_root(rsp)->lock)
> >  {
> > +       raw_spin_unlock_irqrestore(&rcu_get_root(rsp)->lock, flags);
> > +       wake_up(&rsp->gp_wq);  /* Memory barrier implied by wake_up() path. */
> >  } 
> 
> Could you now also clean up the locking so that the caller releases this
> lock?
> 
> I so dislike asymmetric locking like that..

Or I could inline the whole thing at the two callsites...

							Thanx, Paul

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