linux-kernel - Re: [PATCH] vmstat: on demand updates from differentials V7

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Message-ID: <20140603154339.GE23860@localhost.localdomain>
Date:	Tue, 3 Jun 2014 17:43:42 +0200
From:	Frederic Weisbecker <fweisbec@...il.com>
To:	Christoph Lameter <cl@...two.org>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Gilad Ben-Yossef <gilad@...yossef.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tejun Heo <tj@...nel.org>, John Stultz <johnstul@...ibm.com>,
	Hakan Akkan <hakanakkan@...il.com>,
	Max Krasnyansky <maxk@...lcomm.com>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org, hughd@...gle.com,
	viresh.kumar@...aro.org, hpa@...or.com, mingo@...nel.org,
	peterz@...radead.org, Mike Frysinger <vapier@...too.org>,
	Minchan Kim <minchan.kim@...il.com>
Subject: Re: [PATCH] vmstat: on demand updates from differentials V7

On Fri, May 30, 2014 at 08:52:42AM -0500, Christoph Lameter wrote:
> On Fri, 30 May 2014, Frederic Weisbecker wrote:
> 
> > > +	cpu_stat_off = kmalloc(cpumask_size(), GFP_KERNEL);
> > > +	cpumask_copy(cpu_stat_off, cpu_online_mask);
> >
> > Actually looks like you can as well remove that cpumask and use
> > cpu_online_mask directly.
> 
> That would mean I would offline cpus that do not need the
> vmstat worker?

I missed that works adaptively set or clear cpus from the mask. Nevermind,
just ignore what I said.
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