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From: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
To: Nikanth Karthikesan <knikanth@suse.de>
Subject: Re: [PATCH v2] After swapout/swapin private dirty mappings are reported clean in smaps
Cc: kosaki.motohiro@jp.fujitsu.com, Richard Guenther <rguenther@suse.de>,
        linux-mm@kvack.org, Andrew Morton <akpm@linux-foundation.org>,
        balbir@linux.vnet.ibm.com, Michael Matz <matz@novell.com>,
        Matt Mackall <mpm@selenic.com>, linux-kernel@vger.kernel.org
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Date: Wed, 15 Sep 2010 09:26:36 +0900 (JST)
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> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 439fc1f..06fc468 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -368,7 +368,11 @@ static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end,
>  				mss->shared_clean += PAGE_SIZE;
>  			mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount;
>  		} else {
> -			if (pte_dirty(ptent))
> +			/*
> +			 * File-backed pages, now anonymous are dirty
> +			 * with respect to the file.
> +			 */
> +			if (pte_dirty(ptent) || (vma->vm_file && PageAnon(page)))
>  				mss->private_dirty += PAGE_SIZE;
>  			else
>  				mss->private_clean += PAGE_SIZE;

This is risky than v1. number of dirties are used a lot of application.