linux-kernel - Re: [PATCH v2 1/1] mm/ksm: improve deduplication of zero pages with colouring

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Message-ID: <20170119221126.GP10177@redhat.com>
Date:   Thu, 19 Jan 2017 23:11:26 +0100
From:   Andrea Arcangeli <aarcange@...hat.com>
To:     Claudio Imbrenda <imbrenda@...ux.vnet.ibm.com>
Cc:     linux-mm@...ck.org, borntraeger@...ibm.com, hughd@...gle.com,
        chrisw@...s-sol.org, akpm@...ux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 1/1] mm/ksm: improve deduplication of zero pages with
 colouring

Hello,

On Thu, Jan 19, 2017 at 07:35:53PM +0100, Claudio Imbrenda wrote:
> +/* Checksum of an empty (zeroed) page */
> +static unsigned int zero_checksum;
> +
> +/* Whether to merge empty (zeroed) pages with actual zero pages */
> +static bool ksm_use_zero_pages;

Both could be defined as __read_mostly.