linux-kernel - Re: [PATCH 2/5] writeback: dirty position control

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Message-ID: <20110816085932.GC19970@localhost>
Date:	Tue, 16 Aug 2011 16:59:33 +0800
From:	Wu Fengguang <fengguang.wu@...el.com>
To:	Vivek Goyal <vgoyal@...hat.com>
Cc:	"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Jan Kara <jack@...e.cz>, Christoph Hellwig <hch@....de>,
	Dave Chinner <david@...morbit.com>,
	Greg Thelen <gthelen@...gle.com>,
	Minchan Kim <minchan.kim@...il.com>,
	Andrea Righi <arighi@...eler.com>,
	linux-mm <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/5] writeback: dirty position control

> > bdi_position_ratio() provides a scale factor to bdi->dirty_ratelimit, so
> > that the resulted task rate limit can drive the dirty pages back to the
> > global/bdi setpoints.
> > 
> 
> IMHO, "position_ratio" is not necessarily very intutive. Can there be
> a better name? Based on your slides, it is scaling factor applied to
> task rate limit depending on how well we are doing in terms of meeting
> our goal of dirty limit. Will "dirty_rate_scale_factor" or something like
> that make sense and be little more intutive? 

Yeah position_ratio is some scale factor to the dirty rate, and I
added a comment for that. On the other hand position_ratio does
reflect the underlying "position control of dirty pages" logic. So
over time it should be reasonably understandable in the other way :)

Thanks,
Fengguang
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