linux-kernel - Re: [patch 2/2] [PATCH] mm: Save soft-dirty bits on file pages

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Date:	Thu, 8 Aug 2013 18:51:20 +0400
From:	Cyrill Gorcunov <gorcunov@...il.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	luto@...capital.net, xemul@...allels.com, mpm@...enic.com,
	xiaoguangrong@...ux.vnet.ibm.com, mtosatti@...hat.com,
	kosaki.motohiro@...il.com, sfr@...b.auug.org.au,
	peterz@...radead.org, aneesh.kumar@...ux.vnet.ibm.com
Subject: Re: [patch 2/2] [PATCH] mm: Save soft-dirty bits on file pages

On Wed, Aug 07, 2013 at 01:28:12PM -0700, Andrew Morton wrote:
> 
> Good god.
> 
> I wonder if these can be turned into out-of-line functions in some form
> which humans can understand.
> 
> or
> 
> #define pte_to_pgoff(pte)
> 	frob(pte, PTE_FILE_SHIFT1, PTE_FILE_BITS1) +
> 	frob(PTE_FILE_SHIFT2, PTE_FILE_BITS2) +
> 	frob(PTE_FILE_SHIFT3, PTE_FILE_BITS3) +
> 	frob(PTE_FILE_SHIFT4, PTE_FILE_BITS1 + PTE_FILE_BITS2 + PTE_FILE_BITS3)

Hi, here is what I ended up with. Please take a look (I decided to post
patch in the thread since it's related to the context of the mails).

View attachment "pte-sft-dirty-file-cleanup-2" of type "text/plain" (5560 bytes)