From mboxrd@z Thu Jan  1 00:00:00 1970
From: Wu Fengguang <fengguang.wu@intel.com>
Subject: Re: [PATCH 2/5] writeback: dirty position control
Date: Fri, 12 Aug 2011 19:11:39 +0800
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Cc: "linux-fsdevel@vger.kernel.org" <linux-fsdevel@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Jan Kara <jack@suse.cz>, Christoph Hellwig <hch@lst.de>,
	Dave Chinner <david@fromorbit.com>,
	Greg Thelen <gthelen@google.com>,
	Minchan Kim <minchan.kim@gmail.com>,
	Vivek Goyal <vgoyal@redhat.com>,
	Andrea Righi <arighi@develer.com>,
	linux-mm <linux-mm@kvack.org>,
	LKML <linux-kernel@vger.kernel.org>
To: Peter Zijlstra <peterz@infradead.org>
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On Fri, Aug 12, 2011 at 05:47:54PM +0800, Peter Zijlstra wrote:
> On Fri, 2011-08-12 at 10:43 +0800, Wu Fengguang wrote:
> > >                s - x 3
> > >  f(x) :=  1 + (-----)
> > >                l - s
> > 
> 
> > Looks very neat, much simpler than the three curves solution!
> 
> Glad you like it, there is of course the small matter of real-world
> behaviour to consider, lets hope that works as well :-)

It magically meets all the criteria in my mind, not to mention it can
eliminate 2 extra patches. As for the tests, so far, so good :)

Your arithmetics are awesome!

Thanks,
Fengguang