linux-kernel - Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4

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Date:	Tue, 6 Oct 2015 13:36:37 -0700
From:	Josh Triplett <josh@...htriplett.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Oleg Nesterov <oleg@...hat.com>, linux-kernel@...r.kernel.org,
	mingo@...nel.org, jiangshanlai@...il.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	tglx@...utronix.de, peterz@...radead.org, rostedt@...dmis.org,
	dhowells@...hat.com, edumazet@...gle.com, dvhart@...ux.intel.com,
	fweisbec@...il.com, bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 0/13] percpu-rwsem patches for 4.4

On Tue, Oct 06, 2015 at 12:33:11PM -0700, Paul E. McKenney wrote:
> On Tue, Oct 06, 2015 at 08:50:56PM +0200, Oleg Nesterov wrote:
> > On 10/06, Josh Triplett wrote:
> > >
> > > For all 13:
> > > Reviewed-by: Josh Triplett <josh@...htriplett.org>
> > 
> > Thanks!
> > 
> > > Regarding the rcu_sync infrastructure: odd that an atomic read
> > > on the reader proves ligher weight than
> > > rcu_read_lock()/rcu_read_unlock().
> > 
> > Cough... Could you spell? ;) I am just curious and I can't understand
> > what do you mean.
> 
> I would guess that Josh is thinking of CONFIG_PREEMPT=n and that you
> worked with CONFIG_PREEMPT=y.  But it would be good to get this fully
> understood.

Right.

- Josh Triplett
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