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Date: Mon, 28 Jan 2013 15:08:54 -0800
From: Andrew Morton <akpm@linux-foundation.org>
To: Hugh Dickins <hughd@google.com>
Cc: Petr Holasek <pholasek@redhat.com>, Andrea Arcangeli <aarcange@redhat.com>,
        Izik Eidus <izik.eidus@ravellosystems.com>,
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        Anton Arapov <anton@redhat.com>, linux-kernel@vger.kernel.org,
        linux-mm@kvack.org
Subject: Re: [PATCH 1/11] ksm: allow trees per NUMA node
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On Fri, 25 Jan 2013 17:54:53 -0800 (PST)
Hugh Dickins <hughd@google.com> wrote:

> +/* Zeroed when merging across nodes is not allowed */
> +static unsigned int ksm_merge_across_nodes = 1;

I spose this should be __read_mostly.  If __read_mostly is not really a
synonym for __make_write_often_storage_slower.  I continue to harbor
fear, uncertainty and doubt about this...