Messages in this thread | | | From | Marvin Justice <> | Subject | Re: i686 SMP systems with more then 12 GB ram with 2.4.x kernel ? | Date | Sun, 6 Jan 2002 12:59:12 -0600 |
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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)
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 - 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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