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

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Message-ID: <20140804134828.GM8101@linux.vnet.ibm.com>
Date:	Mon, 4 Aug 2014 06:48:28 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Oleg Nesterov <oleg@...hat.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, peterz@...radead.org,
	rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
	dvhart@...ux.intel.com, fweisbec@...il.com, bobby.prani@...il.com
Subject: Re: [PATCH v3 tip/core/rcu 1/9] rcu: Add call_rcu_tasks()

On Mon, Aug 04, 2014 at 03:29:27PM +0200, Oleg Nesterov wrote:
> On 08/03, Paul E. McKenney wrote:
> >
> > If I understand correctly, your goal is to remove a synchronize_sched()
> > worth of latency from the overall RCU-tasks callback latency.  Or am I
> > still confused?
> 
> Yes, exactly. But again, I am not sure this minor optimization makes sense,
> mostly I tried to check my understanding.

No problem with your understanding!  ;-)

I am not going to include this optimization in the first round, but
I will certainly keep it in mind should grace-period latency from
nearly concurrent updates become a problem.

							Thanx, Paul

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