Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19

[Martin J. Bligh]

--On Thursday, November 03, 2005 11:35:28 -0800 Linus Torvalds <torvalds@xxxxxxxx> wrote:

> 
> 
> On Thu, 3 Nov 2005, Martin J. Bligh wrote:
>> 
>> Possibly, I can redo the calculations easily enough (have to go for now,
>> but I just sent the other ones). But we don't keep a fixed percentage of
>> memory free - we cap it ... perhaps we should though?
> 
> I suspect the capping may well be from some old HIGHMEM interaction on x86 
> (ie "don't keep half a gig free in the normal zone just because we have 
> 16GB in the high-zone". We used to have serious balancing issues, and I 
> wouldn't be surprised at all if there are remnants from that. Stuff that 
> simply hasn't been visible, because not a lot of people had many many GB 
> of memory even on machines that didn't need HIGHMEM.

But pages_min is based on the zone size, not the system size. And we
still cap it. Maybe that's just a mistake?

M.

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