Messages in this thread |  | | Date | Wed, 3 Oct 2001 21:38:07 -0300 (BRST) | From | Rik van Riel <> | Subject | Re: Whining about 2.5 (was Re: [PATCH] Re: bug? in using generic read/write functions to read/write block devices in 2.4.11-pre2) |
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On Wed, 3 Oct 2001, Rob Landley wrote:
> (Oh, and what's the deal with "classzones"? Linus told Andrea > classzones were a dumb idea, and we'd regret it when we tried to > inflict NUMA architecture on 2.5, but then went with Andrea's VM > anyway, which I thought was based on classzones... Was that ever > resolved? What the problem avoided? What IS a classzone, anyway? > I'd be happy to RTFM, if anybody could tell me where TF the M is > hiding...)
Classzones used to be a superset of the memory zones, so if you have memory zones A, B and C you'd have classzone Ac consisting of memory zone A, classzone Bc = {A + B} and Cc = {A + B + C}.
This gives obvious problems for NUMA, suppose you have 4 nodes with zones 1A, 1B, 1C, 2A, 2B, 2C, 3A, 3B, 3C, 4A, 4B and 4C. Putting together classzones for these isn't quite obvious and memory balancing will be complex ;)
Of course, nobody knows the exact definitions of classzones in the new 2.4 VM since it's completely undocumented; lets hope Andrea will document his code or we'll see a repeat of the development chaos we had with the 2.2 VM...
cheers,
Rik -- DMCA, SSSCA, W3C? Who cares? http://thefreeworld.net/ (volunteers needed)
http://www.surriel.com/ http://distro.conectiva.com/
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