Messages in this thread | | | From | Daniel Freedman <> | Date | Sun, 6 Jan 2002 14:45:25 -0500 | Subject | Re: i686 SMP systems with more then 12 GB ram with 2.4.x kernel ? |
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Hi Marvin,
Thanks for the quick reply.
On Sun, Jan 06, 2002, Marvin Justice wrote: > Is this what your looking for? Just below the definition of PAGE_OFFSET in > page.h: > > /* > * This much address space is reserved for vmalloc() and iomap() > * as well as fixmap mappings. > */ > #define __VMALLOC_RESERVE (128 << 20)
However, while it does seem to be exactly the definition for 128MB vmalloc offset that I was looking for, I don't seem to have this definition in my source tree (2.4.16):
freedman@planck:/usr/src/linux$ grep -r __VMALLOC_RESERVE * freedman@planck:/usr/src/linux$
Any idea why this is so?
Thanks again,
Daniel
> On Sunday 06 January 2002 12:39 pm, Daniel Freedman wrote: > > 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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