linux-kernel - Re: [PATCH] hotplug: Optimize {get,put}_online

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Message-ID: <20130923173014.GF9326@twins.programming.kicks-ass.net>
Date:	Mon, 23 Sep 2013 19:30:14 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Cc:	Steven Rostedt <rostedt@...dmis.org>, Mel Gorman <mgorman@...e.de>,
	Rik van Riel <riel@...hat.com>,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Oleg Nesterov <oleg@...hat.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] hotplug: Optimize {get,put}_online_cpus()

On Mon, Sep 23, 2013 at 10:04:00AM -0700, Paul E. McKenney wrote:
> At some point I suspect that we will want some form of fairness, but in
> the meantime, good point.

I figured we could start a timer on hotplug to force quiesce the readers
after about 10 minutes or so ;-)

Should be a proper discouragement from (ab)using this hotplug stuff...

Muwhahaha
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