linux-kernel - Re: [PATCH RFC tip/core/rcu 6/6] rcu: Reduce cache-miss initialization latencies for large systems

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Message-ID: <20120426202940.GL2407@linux.vnet.ibm.com>
Date:	Thu, 26 Apr 2012 13:29:40 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	linux-kernel@...r.kernel.org, mingo@...e.hu, laijs@...fujitsu.com,
	dipankar@...ibm.com, akpm@...ux-foundation.org,
	mathieu.desnoyers@...ymtl.ca, josh@...htriplett.org,
	niv@...ibm.com, tglx@...utronix.de, rostedt@...dmis.org,
	Valdis.Kletnieks@...edu, dhowells@...hat.com,
	eric.dumazet@...il.com, darren@...art.com, fweisbec@...il.com,
	patches@...aro.org
Subject: Re: [PATCH RFC tip/core/rcu 6/6] rcu: Reduce cache-miss
 initialization latencies for large systems

On Thu, Apr 26, 2012 at 09:47:44PM +0200, Peter Zijlstra wrote:
> On Thu, 2012-04-26 at 21:41 +0200, Peter Zijlstra wrote:
> > 
> > I can very easily give you the size (nr cpus in) a node, still as long
> > as you iterate the cpu space linearly that's not going to be much
> > help.
> > 
> Oh, I forgot, the numa masks etc are available, depending on
> CONFIG_NUMA, as cpumask_of_node(n).

These change with each CPU-hotplug operation?  Or is a given CPU
hotplug operation guaranteed to change only those node masks that
the CPU was (or will be, in the case of online) a member?

							Thanx, Paul

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