linux-kernel - Re: [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu

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Date:	Sun, 10 Aug 2014 20:30:48 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	laijs@...fujitsu.com, dipankar@...ibm.com,
	akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
	josh@...htriplett.org, 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 v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks()

On Sun, Aug 10, 2014 at 10:14:25AM +0200, Peter Zijlstra wrote:
> On Sat, Aug 09, 2014 at 06:29:24PM -0700, Paul E. McKenney wrote:
> > On Sat, Aug 09, 2014 at 08:24:00PM +0200, Peter Zijlstra wrote:
> > > On Sat, Aug 09, 2014 at 08:19:20PM +0200, Peter Zijlstra wrote:
> > > > How about we simply assume 'idle' code, as defined by the rcu idle hooks
> > > > are safe? Why do we want to bend over backwards to cover this?
> > > 
> > > The thing is, we already have the special rcu trace hooks for tracing
> > > inside this rcu-idle section, so why go beyond this now?
> > 
> > I have to defer to Steven and Masami on this one, but I would guess that
> > they want the ability to trace the idle loop for the same reasons they
> > stated earlier.
> 
> want want want, I want a damn pony but somehow I'm not getting one. Why
> are they getting this?

We can only be glad that my daughters' old My Little Pony toys are
long gone (http://en.wikipedia.org/wiki/My_Little_Pony).  Not sure I
would have been able to resist sending one along.  ;-)

							Thanx, Paul

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