linux-kernel - Re: [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB kthread wakeups

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Date:	Wed, 27 Aug 2014 10:08:24 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Pranith Kumar <pranith@...ech.edu>
Cc:	Amit Shah <amit.shah@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Rik van Riel <riel@...hat.com>,
	Ingo Molnar <mingo@...nel.org>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Dipankar Sarma <dipankar@...ibm.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Josh Triplett <josh@...htriplett.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Peter Zijlstra <peterz@...radead.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	David Howells <dhowells@...hat.com>,
	Eric Dumazet <edumazet@...gle.com>, dvhart@...ux.intel.com,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Oleg Nesterov <oleg@...hat.com>,
	Silas Boyd-Wickizer <sbw@....edu>
Subject: Re: [PATCH tip/core/rcu 1/2] rcu: Parallelize and economize NOCB
 kthread wakeups

On Wed, Aug 27, 2014 at 12:43:01PM -0400, Pranith Kumar wrote:
> On Wed, Aug 27, 2014 at 12:21 PM, Paul E. McKenney
> <paulmck@...ux.vnet.ibm.com> wrote:
> > On Wed, Aug 27, 2014 at 10:13:50AM +0530, Amit Shah wrote:
> 
> >>
> >> Yes, this patch helps my case as well.
> >
> > Very good!!!
> >
> > Pranith, I can take this patch, but would you be willing to invert
> > the sense of ->nocb_leader_wake (e.g., call it ->nocb_leader_sleep or
> > some such)?  This field is only used in eight places in the source code.
> >
> > The idea is that inverting the sense of the field allows the normal C
> > initialization of zero to properly initialize this field, plus it gets
> > rid of a few lines of code.
> 
> Sure, that is indeed a good idea. I will send a new patch.

Very good, looking forward to seeing it!

							Thanx, Paul

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