linux-ext4 - Re: [PATCH, RFC] vm: Add an tuning knob for vm.max_writeback

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Message-ID: <20090831203636.GD12579@kernel.dk>
Date:	Mon, 31 Aug 2009 22:36:36 +0200
From:	Jens Axboe <jens.axboe@...cle.com>
To:	Theodore Tso <tytso@....edu>
Cc:	Christoph Hellwig <hch@...radead.org>, linux-mm@...ck.org,
	Ext4 Developers List <linux-ext4@...r.kernel.org>,
	linux-fsdevel@...r.kernel.org, chris.mason@...cle.com
Subject: Re: [PATCH, RFC] vm: Add an tuning knob for vm.max_writeback_pages

On Mon, Aug 31 2009, Theodore Tso wrote:
> At the risk of asking a stupid question, what *is* range_cyclic and
> what is it trying to do?  I've been looking at the code and am I'm
> getting myself very confused about what the code is trying to do and
> what was its original intent.

Range cyclic means that the current writeback in ->writepages() should
start where it left off the last time, non-range cyclic starts off at
->range_start. ->writepages() can use mapping->writeback_index to store
such information.

-- 
Jens Axboe

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