linux-kernel - Re: [PATCH tip/core/rcu 18/18] rcu: Better hotplug handling for synchronize_sched

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Message-ID: <20151009035414.GP3910@linux.vnet.ibm.com>
Date:	Thu, 8 Oct 2015 20:54:14 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Josh Triplett <josh@...htriplett.org>
Cc:	Peter Zijlstra <peterz@...radead.org>,
	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, rostedt@...dmis.org, dhowells@...hat.com,
	edumazet@...gle.com, dvhart@...ux.intel.com, fweisbec@...il.com,
	oleg@...hat.com, bobby.prani@...il.com
Subject: Re: [PATCH tip/core/rcu 18/18] rcu: Better hotplug handling for
 synchronize_sched_expedited()

On Thu, Oct 08, 2015 at 05:48:13PM -0700, Josh Triplett wrote:
> On Thu, Oct 08, 2015 at 05:11:11PM -0700, Paul E. McKenney wrote:
> > On Thu, Oct 08, 2015 at 11:01:14AM -0700, Josh Triplett wrote:
> > > On Thu, Oct 08, 2015 at 08:19:03AM -0700, Paul E. McKenney wrote:
> > > > On Thu, Oct 08, 2015 at 05:12:42PM +0200, Peter Zijlstra wrote:
> > > > > On Thu, Oct 08, 2015 at 08:06:39AM -0700, Paul E. McKenney wrote:
> > > > > > Please see below for the fixed version.  Thoughts?
> > > > > 
> > > > > > +	__releases(rnp->lock) /* But leaves rrupts disabled. */
> > > > > > +	raw_spin_unlock(&rnp->lock); /* rrupts remain disabled. */
> > > > > > +		raw_spin_lock(&rnp->lock); /* rrupts already disabled. */
> > > > > 
> > > > > What them 'rrupts' about? ;-)
> > > > 
> > > > Interrupts when it won't fit.  I suppose I could use IRQs instead.  ;-)
> > > 
> > > In this particular case, "IRQs" works just as well; however, in general,
> > > this seems like an excellent example of when to ignore the 80-column
> > > guideline. :)
> > 
> > But but but...   You are talking to someone who used actual PUNCHED CARDS
> > in real life in a paying job!!!  ;-)
> 
> And I learned on a DOS system with 80x25 text mode.  Let us revel in
> wonderment at the capabilities of modern systems. :)

But of course!  On my new 2880x1620 screen, I can put four 80x24 xterms
on each row!

Too bad that I cannot actually read them without an external monitor,
and my current external monitors are only 1920x1600.  ;-)

							Thanx, Paul

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