linux-kernel - Re: [PATCH 2/6] mm: vmstat: move slab statistics from zone to node counters

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Date:   Mon, 5 Jun 2017 14:38:31 -0700
From:   Andrew Morton <akpm@...ux-foundation.org>
To:     Johannes Weiner <hannes@...xchg.org>
Cc:     Michael Ellerman <mpe@...erman.id.au>,
        Yury Norov <ynorov@...iumnetworks.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Josef Bacik <josef@...icpanda.com>,
        Michal Hocko <mhocko@...e.com>,
        Vladimir Davydov <vdavydov.dev@...il.com>,
        Rik van Riel <riel@...hat.com>, linux-mm@...ck.org,
        cgroups@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-team@...com, linux-s390@...r.kernel.org
Subject: Re: [PATCH 2/6] mm: vmstat: move slab statistics from zone to node
 counters

On Mon, 5 Jun 2017 14:35:11 -0400 Johannes Weiner <hannes@...xchg.org> wrote:

> --- a/mm/page_alloc.c
> +++ b/mm/page_alloc.c
> @@ -5107,6 +5107,7 @@ static void build_zonelists(pg_data_t *pgdat)
>   */
>  static void setup_pageset(struct per_cpu_pageset *p, unsigned long batch);
>  static DEFINE_PER_CPU(struct per_cpu_pageset, boot_pageset);
> +static DEFINE_PER_CPU(struct per_cpu_nodestat, boot_nodestats);
>  static void setup_zone_pageset(struct zone *zone);

There's a few kb there.  It just sits evermore unused after boot?