linux-kernel - Re: [RFC PATCH] mm: balance_dirty_pages. reduce calls to global_page

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Message-Id: <E1MgbB6-0003fp-BU@pomaz-ex.szeredi.hu>
Date:	Thu, 27 Aug 2009 11:21:56 +0200
From:	Miklos Szeredi <miklos@...redi.hu>
To:	richard@....demon.co.uk
CC:	miklos@...redi.hu, a.p.zijlstra@...llo.nl,
	akpm@...ux-foundation.org, chris.mason@...cle.com,
	linux-kernel@...r.kernel.org, jens.axboe@...cle.com
Subject: Re: [RFC PATCH] mm: balance_dirty_pages. reduce calls to
 global_page_state to reduce cache references

On Wed, 26 Aug 2009, Richard Kennedy wrote:
> The old behavior was to use NR_WRITEBACK_TEMP to clip the bdi
> thresholds.

Right.

> Should we continue to do this or just ignore NR_WRIEBACK_TEMP completely
> in balance_dirty_pages ?

I think we should.  Using NR_WRIEBACK_TEMP for setting up per-bdi
thresholds should be OK.  It limits the total number of writback pages
(including fuse ones) but doesn't prevent individual bdi's from
continuing writback at their own pace.

Thanks,
Miklos
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