linux-kernel - Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd work

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Message-ID: <alpine.DEB.2.11.1503271444460.23488@gentwo.org>
Date:	Fri, 27 Mar 2015 14:45:36 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	Peter Zijlstra <peterz@...radead.org>
cc:	Viresh Kumar <viresh.kumar@...aro.org>,
	Andrew Morton <akpm@...ux-foundation.org>, hannes@...xchg.org,
	Linaro Kernel Mailman List <linaro-kernel@...ts.linaro.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	vinmenon@...eaurora.org, shashim@...eaurora.org,
	Michal Hocko <mhocko@...e.cz>, mgorman@...e.de,
	dave@...olabs.net, koct9i@...il.com,
	Linux Memory Management List <linux-mm@...ck.org>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC] vmstat: Avoid waking up idle-cpu to service shepherd
 work

On Fri, 27 Mar 2015, Peter Zijlstra wrote:

> On Fri, Mar 27, 2015 at 06:11:44AM -0500, Christoph Lameter wrote:
> >
> > Create a new slab cache for this purpose that does the proper aligning?
>
> That is certainly a possibility, but we'll only ever allocate nr_cpus-1
> entries from it, a whole new slab cache might be overkill.

This will certainly be aliased to some other slab cache so not much
overhead is created.
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