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Message-ID: <1271075670.4807.2.camel@twins>
Date: Mon, 12 Apr 2010 14:34:30 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Lai Jiangshan <laijs@...fujitsu.com>
Cc: Oleg Nesterov <oleg@...hat.com>, Gautham R Shenoy <ego@...ibm.com>,
Rusty Russell <rusty@...tcorp.com.au>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Hugh Dickins <hugh.dickins@...cali.co.uk>,
Ingo Molnar <mingo@...e.hu>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Nathan Fontenot <nfont@...tin.ibm.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Thomas Gleixner <tglx@...utronix.de>,
Sachin Sant <sachinp@...ibm.com>,
"H. Peter Anvin" <hpa@...or.com>,
Shane Wang <shane.wang@...el.com>,
Roland McGrath <roland@...hat.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] cpuhotplug: make get_online_cpus() scalability by
using percpu counter
On Mon, 2010-04-12 at 20:30 +0800, Lai Jiangshan wrote:
> Because read-preference RWL will cause write site starvation.
Sure, but why is that a problem? Hotplug should be a rare event, who
cares if it takes a while to come through.
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