Messages in this thread | | | From | Werner Almesberger <> | Subject | Re: MM with fragmented memory | Date | Tue, 27 Oct 1998 12:21:05 +0100 (MET) |
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Jamie Lokier wrote: > You don't have to arrange the memory map this way. Try changing the > definition of MAP_NR to use a small lookup table or even a calculation > (if the memory layout is regular) for the upper page address bits.
Good point. Maybe I've chickened out a bit too quickly.
I've now written everything with a virtually linear kernel address space and so far it looks good (kernel makes it to the point where it tries to mount the root FS). I was pleased by how few changes were actually necessary.
Maybe I'll retry a 1:1 mapping approach again once we have the system in a more complete state and run some benchmarks to compare them. If the difference is significant, it may be worth supporting a 1:1 mapped model in spite of the inconvenient setup procedure.
Thanks, - Werner
-- _________________________________________________________________________ / Werner Almesberger, DI-ICA,EPFL,CH werner.almesberger@lrc.di.epfl.ch / /_IN_R_131__Tel_+41_21_693_6621__Fax_+41_21_693_6610_____________________/
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