linux-kernel - Re: [00/41] Large Blocksize Support V7 (adds memmap support)

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Message-Id: <FC0BC57A-E5D3-487F-A0A6-00AA8E3578AC@mac.com>
Date:	Mon, 24 Sep 2007 08:32:30 -0400
From:	Kyle Moffett <mrmacman_g4@....com>
To:	Goswin von Brederlow <brederlo@...ormatik.uni-tuebingen.de>
Cc:	mel@...net.ie (Mel Gorman),
	Andrew Morton <akpm@...ux-foundation.org>,
	Joern Engel <joern@...fs.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Christoph Lameter <clameter@....com>, andrea@...e.de,
	torvalds@...ux-foundation.org, linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org, Christoph Hellwig <hch@....de>,
	William Lee Irwin III <wli@...omorphy.com>,
	David Chinner <dgc@....com>,
	Jens Axboe <jens.axboe@...cle.com>,
	Badari Pulavarty <pbadari@...il.com>,
	Maxim Levitsky <maximlevitsky@...il.com>,
	Fengguang Wu <fengguang.wu@...il.com>,
	swin wang <wangswin@...il.com>, totty.lu@...il.com,
	hugh@...itas.com
Subject: Re: [00/41] Large Blocksize Support V7 (adds memmap support)

On Sep 23, 2007, at 02:22:12, Goswin von Brederlow wrote:
> mel@...net.ie (Mel Gorman) writes:
>> On (16/09/07 23:58), Goswin von Brederlow didst pronounce:
>>> But when you already have say 10% of the ram in mixed groups then  
>>> it is a sign the external fragmentation happens and some time  
>>> should be spend on moving movable objects.
>>
>> I'll play around with it on the side and see what sort of results  
>> I get.  I won't be pushing anything any time soon in relation to  
>> this though.  For now, I don't intend to fiddle more with grouping  
>> pages by mobility for something that may or may not be of benefit  
>> to a feature that hasn't been widely tested with what exists today.
>
> I watched the videos you posted. A nice and quite clear improvement  
> with and without your logic. Cudos.
>
> When you play around with it may I suggest a change to the display  
> of the memory information. I think it would be valuable to use a  
> Hilbert Curve to arange the pages into pixels. Like this:
>
> # #  0  3
> # #
> ###  1  2
>
> ### ###  0 1 E F
>   # #
> ### ###  3 2 D C
> #     #
> # ### #  4 7 8 B
> # # # #
> ### ###  5 6 9 A

Here's an excellent example of an 0-255 numbered hilbert curve used  
to enumerate the various top-level allocations of IPv4 space:
http://xkcd.com/195/

Cheers,
Kyle Moffett

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