linux-kernel - Re: [PATCH v2] After swapout/swapin private dirty mappings are reported clean in smaps

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Message-Id: <20100915092504.C9DC.A69D9226@jp.fujitsu.com>
Date:	Wed, 15 Sep 2010 09:26:36 +0900 (JST)
From:	KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>
To:	Nikanth Karthikesan <knikanth@...e.de>
Cc:	kosaki.motohiro@...fujitsu.com,
	Richard Guenther <rguenther@...e.de>, linux-mm@...ck.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	balbir@...ux.vnet.ibm.com, Michael Matz <matz@...ell.com>,
	Matt Mackall <mpm@...enic.com>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] After swapout/swapin private dirty mappings are reported clean in smaps

> 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. 


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