Re: [RFC] [RFT] [PATCH] memory zone balancing

[Rik van Riel <riel@nl.linux.org>]

On Tue, 4 Jan 2000, Rik van Riel wrote:

> d+r+h > limit
> d     > limit/2
> r     > limit/4
> h     > limit/8

Ehmmm, wait. I messed up on this one.
We probably want to have a bit more freedom
so the page freeing algorithm doesn't do too
much scanning for nothing.

d+r+h 	> limit
d	> limit/4
r	> limit/4
h	don't care, even on a 1.5GB machine h will
	be 1/3 of total memory, so we'll usually
	have a few free pages in here

> DMA pages should always be present, regular pages for
> storing pagetables and stuff need to be there too, higmem
> pages we don't really care about.
> 
> Btw, I think we probably want to increase freepages.min
> to 512 or even more on machines that have >1GB of memory.
> The current limit of 256 was really intended for machines
> with a single zone of memory...
> 
> (but on <1GB machines I don't know if it makes sense to
> raise the limit much more ... maybe we should raise the
> limit automagically if the page alloc/io rate is too
> high?)

Rik
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