linux-kernel - Re: [PATCH 17/23] mm: count writeback pages per BDI

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Message-ID: <Pine.LNX.4.64.0708091214330.27092@schroedinger.engr.sgi.com>
Date:	Thu, 9 Aug 2007 12:15:07 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	miklos@...redi.hu, akpm@...ux-foundation.org, neilb@...e.de,
	dgc@....com, tomoki.sekiyama.qu@...achi.com, nikita@...sterfs.com,
	trond.myklebust@....uio.no, yingchao.zhou@...il.com,
	richard@....demon.co.uk, torvalds@...ux-foundation.org
Subject: Re: [PATCH 17/23] mm: count writeback pages per BDI

On Fri, 3 Aug 2007, Peter Zijlstra wrote:

>  						page_index(page),
>  						PAGECACHE_TAG_WRITEBACK);
> +			if (bdi_cap_writeback_dirty(bdi))
> +				__dec_bdi_stat(bdi, BDI_WRITEBACK);

Why are these not incremented and decremented in the exact location of 
NR_WRITEBACK?
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