linux-kernel - Re: [PATCH] ksm: add vm_stat and meminfo entry to reflect pte mapping to ksm pages

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Date:	Mon, 28 Feb 2011 18:21:48 -0800
From:	Dave Hansen <dave@...ux.vnet.ibm.com>
To:	nai.xia@...il.com
Cc:	Izik Eidus <ieidus@...hat.com>,
	Hugh Dickins <hugh.dickins@...cali.co.uk>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Chris Wright <chrisw@...s-sol.org>,
	Rik van Riel <riel@...hat.com>, linux-kernel@...r.kernel.org,
	linux-mm@...ck.org, kernel-janitors@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [PATCH] ksm: add vm_stat and meminfo entry to reflect pte
 mapping to ksm pages

On Sat, 2011-02-26 at 22:56 +0800, Nai Xia wrote
> @@ -904,6 +905,10 @@ static int try_to_merge_one_page(struct vm_area_struct 
> *vma,
>                          */
>                         set_page_stable_node(page, NULL);
>                         mark_page_accessed(page);
> +                       if (mapcount)
> +                               add_zone_page_state(page_zone(page),
> +                                                   NR_KSM_PAGES_SHARING,
> +                                                   mapcount);
>                         err = 0;
>                 } else if (pages_identical(page, kpage))
>                         err = replace_page(vma, page, kpage, orig_pte); 

If you're going to store this per-zone, does it make sense to have it
show up in /proc/zoneinfo?  meminfo's also getting pretty porky these
days, so I almost wonder if it should stay in zoneinfo only.

-- Dave

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