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Date: Mon, 5 Jun 2017 14:38:31 -0700
From: Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH 2/6] mm: vmstat: move slab statistics from zone to node
 counters
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Sender: owner-linux-mm@kvack.org
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To: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>, Yury Norov <ynorov@caviumnetworks.com>, Heiko Carstens <heiko.carstens@de.ibm.com>, Josef Bacik <josef@toxicpanda.com>, Michal Hocko <mhocko@suse.com>, Vladimir Davydov <vdavydov.dev@gmail.com>, Rik van Riel <riel@redhat.com>, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, kernel-team@fb.com, linux-s390@vger.kernel.org

On Mon, 5 Jun 2017 14:35:11 -0400 Johannes Weiner <hannes@cmpxchg.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?

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