linux-kernel - Re: [PATCH 09/12] mm: count unstable pages per BDI

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Message-Id: <1177006362.2934.13.camel@lappy>
Date:	Thu, 19 Apr 2007 20:12:42 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Miklos Szeredi <miklos@...redi.hu>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	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
Subject: Re: [PATCH 09/12] mm: count unstable pages per BDI

On Thu, 2007-04-19 at 19:44 +0200, Miklos Szeredi wrote:
> > Count per BDI unstable pages.
> > 
> 
> I'm wondering, is it really worth having this category separate from
> per BDI brity pages?
> 
> With the exception of the export to sysfs, always the sum of unstable
> + dirty is used.

I guess you are right, but it offends my sense of aesthetics to break
symmetry with the zone statistics. However, it has the added advantage
of only needing 2 deltas as well.

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