linux-kernel - Re: [PATCH 1/6] mm: scalable bdi statistics counters.

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Date:	Wed, 04 Apr 2007 11:25:38 +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
Subject: Re: [PATCH 1/6] mm: scalable bdi statistics counters.

On Wed, 2007-04-04 at 11:20 +0200, Miklos Szeredi wrote:
> > Provide scalable per backing_dev_info statistics counters modeled on the ZVC
> > code.
> 
> Why do we need global_bdi_stat()?  It should give approximately the
> same numbers as global_page_state(), no?

For those counters that are shared, yes. However I find it not obvious
that all BDI counter will always be mirrored in the page stats, and I
actually use it in 6/6, which introduces counters that are not mirrored
in the page stats.



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