linux-kernel - Re: [PATCH tip/core/rcu 7/9] nohz_full: Add full-system-idle arguments to API

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Message-ID: <20130819015046.GB29406@linux.vnet.ibm.com>
Date:	Sun, 18 Aug 2013 18:50:46 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, niv@...ibm.com, tglx@...utronix.de,
	peterz@...radead.org, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, darren@...art.com, fweisbec@...il.com,
	sbw@....edu
Subject: Re: [PATCH tip/core/rcu 7/9] nohz_full: Add full-system-idle
 arguments to API

On Sat, Aug 17, 2013 at 08:11:20PM -0700, Josh Triplett wrote:
> On Sat, Aug 17, 2013 at 06:49:42PM -0700, Paul E. McKenney wrote:
> > From: "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
> > 
> > This commit adds an isidle and jiffies argument to force_qs_rnp(),
> > dyntick_save_progress_counter(), and rcu_implicit_dynticks_qs() to enable
> > RCU's force-quiescent-state process to check for full-system idle.
> > 
> > Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
> > Cc: Frederic Weisbecker <fweisbec@...il.com>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Lai Jiangshan <laijs@...fujitsu.com>
> > [ paulmck: Use true and false for boolean constants per Lai Jiangshan. ]
> 
> One optional comment below; with or without that,
> Reviewed-by: Josh Triplett <josh@...htriplett.org>
> 
> >  kernel/rcutree.c | 23 ++++++++++++++++-------
> >  1 file changed, 16 insertions(+), 7 deletions(-)
> > 
> > diff --git a/kernel/rcutree.c b/kernel/rcutree.c
> > index b0d2cc3..f1a0b05 100644
> > --- a/kernel/rcutree.c
> > +++ b/kernel/rcutree.c
> > @@ -246,7 +246,9 @@ module_param(jiffies_till_next_fqs, ulong, 0644);
> >  
> >  static void rcu_start_gp_advanced(struct rcu_state *rsp, struct rcu_node *rnp,
> >  				  struct rcu_data *rdp);
> > -static void force_qs_rnp(struct rcu_state *rsp, int (*f)(struct rcu_data *));
> > +static void force_qs_rnp(struct rcu_state *rsp,
> > +			 int (*f)(struct rcu_data *, bool *, unsigned long *),
> > +			 bool *isidle, unsigned long *maxj);
> 
> You might consider giving the parameters of the function pointer names
> (both here and in the definition), to make it more self-documenting.

Forces a line break, but given that I couldn't immediately recall all
of the parameter names myself, I made the change.  ;-)

							Thanx, Paul

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