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

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Message-ID: <CAKohpomiqOcmZe+tAPNv_kX=+FmtMu8K=Qgze1y2SvgJ1A16NQ@mail.gmail.com>
Date:	Sat, 28 Mar 2015 09:58:38 +0530
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Christoph Lameter <cl@...ux.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Johannes Weiner <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>, Mel Gorman <mgorman@...e.de>,
	dave@...olabs.net, Konstantin Khlebnikov <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 27 March 2015 at 17:32, Peter Zijlstra <peterz@...radead.org> wrote:
> What's not clear to me is why that thing is allocated at all, AFAICT
> something like:
>
> static DEFINE_PER_CPU(struct tvec_base, tvec_bases);
>
> Should do the right thing and be much simpler.

Does this comment from timers.c answers your query ?

                        /*
                         * This is for the boot CPU - we use compile-time
                         * static initialisation because per-cpu memory isn't
                         * ready yet and because the memory allocators are not
                         * initialised either.
                         */
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