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

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Message-ID: <20140810081425.GT9918@twins.programming.kicks-ass.net>
Date:	Sun, 10 Aug 2014 10:14:25 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
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 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?

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