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

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Date:	Thu, 9 Aug 2007 12:27:19 -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 Thu, 9 Aug 2007, Peter Zijlstra wrote:

> Less conditionals. We already have a branch for mapping, why create
> another?

Ah. Okay. This also avoids an interrupt enable disable since you can use 
__ functions. Hmmm... Would be good if we could move the vmstat 
NR_WRITEBACK update there too. Can a page without a mapping be under 
writeback? (Direct I/O?)


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