Messages in this thread | | | Date | Thu, 03 Nov 2005 14:40:30 -0800 | From | "Martin J. Bligh" <> | Subject | Re: [Lhms-devel] [PATCH 0/7] Fragmentation Avoidance V19 |
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--On Thursday, November 03, 2005 11:35:28 -0800 Linus Torvalds <torvalds@osdl.org> 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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