Hello Robert..
regardless of how many docs i read, i'm still a bit unclear on some
of the basics of memory management and "zones", so i'm going to try to
clear some of that up a question or two at a time.
It takes time, but eventually you'll get it.
first, as i read it, the x86 defines three "zones":
ZONE_DMA <16M
ZONE_NORMAL 16M-896M
ZONE_HIGHMEM >896M
Correct. Notice that in 64 bit platform, HIGHMEM simply doesn't exist.
first, are those (physical) partition addresses absolutely *fixed*,
regardless of the amount of RAM on the system? that is, even if i had
a system with only 512M of RAM, *technically*, ZONE_HIGHMEM is still
defined as the memory above 896M,
yes...
even though there is no such memory?
the definition is still true, but ZONE_HIGHMEM doesn't exist is you just
have less than 896 MB. Also, AFAIK, even if you have more than 896 MB
but you don't enable highmem support, you still don't have ZONE_HIGHMEM.
in that case, all of RAM above 16M on my system would be considered
"normal", and i would have *no* "high" memory. is that correct?
yes...
Please notice: this is a MM noob replying....
regards,
Mulyadi
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