Messages in this thread | | | From | Daniel Freedman <> | Date | Sun, 6 Jan 2002 13:39:39 -0500 | Subject | Re: i686 SMP systems with more then 12 GB ram with 2.4.x kernel ? |
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On Jan 01 2002, H. Peter Anvin (hpa@zytor.com) wrote: > By author: Alan Cox <alan@lxorguk.ukuu.org.uk> > > > > > 2. Isn't the boundary at 2^30 really irrelevant and the three "correct" > > > zones are (0 - 2^24-1), (2^24 - 2^32-1) and (2^32 - 2^36-1)? > > > > Nope. The limit for directly mapped memory is 2^30. > > > > 2^30-2^27 to be exact (assuming a 3:1 split and 128MB vmalloc zone.) > > -hpa
For my better understanding, where's the 128MB vmalloc zone assumption defined, please?
I'm pretty sure I understand that the 3:1 split you refer to is defined by PAGE_OFFSET in asm-i386/page.h
But when I tried to find the answer in the source for the vmalloc zone, I looked in linux/mm.h, linux/mmzone.h, linux/vmalloc.h, and mm/vmalloc.c, but couldn't find anything there or in O'Reilly's kernel book that I could follow/understand.
Thanks for any pointers.
Take care,
Daniel
-- Daniel A. Freedman Laboratory for Atomic and Solid State Physics Department of Physics Cornell University - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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