linux-kernel - Differentiating clean and dirty buffer cache pages

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Date:	Wed, 26 Aug 2009 14:22:24 -0700
From:	Anupama Chandwani <anupama.chandwani@...il.com>
To:	linux kernel mailing list <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...l.org>,
	Andrew Morton <akpm@...l.org>
Cc:	Krishna Raj Raja <krraja@...are.com>, vrajesh@...are.com
Subject: Differentiating clean and dirty buffer cache pages

Hi,

I need to get stats about what pages in the buffer cache are clean versus dirty.
I traverse the page_tree pointer of the radix tree of each open file
to get all buffer cache pages.

To identify dirty pages, I think of doing the following:
Level 1. Do a gang lookup in radix tree for PAGECACHE_TAG_DIRTY tag,
Level 2. Check the PTE of buffer cache pages for bit 6(D)

I want to know if checking these two data structures will give me a
complete list of all the dirty pages in the buffer cache?

-- 
Cheers,
Anupama Chandwani
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