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

[Kyle Moffett]

On Sep 23, 2007, at 02:22:12, Goswin von Brederlow wrote:
> mel@xxxxxxxxx (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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