Christoph Lameter wrote on Thursday, October 12, 2006 12:18 PM > IA64 currently uses a dynamically configured memory map that is taken off > the end of VMALLOC space. This means that we do some tweaking with some > core constants that now refer to variables and we keep having to > get the address of the virtual memory map and the limits from memory. > This patch makes pfn_to_page and page_to_pfn possible without referencing > any memory location. > > So, the size of the virtual memory map is always less than 8 Terabyte. > > I think its reasonable to take these 8 Terabyte away from the 128 Terabyte > that we currently reserve for support for VMALLOC space. > > Advantages: > - virt_to_page, page_address, pfn_to_page, page_to_pfn become simple address > calculations without a memory reference. I like the concept a lot. > - This patch will enable later patches to move the virtual memory map into > another region with a larger page size. Larger page sizes will reduce > TLB pressure. I like that even more, which region are you going to move it to? - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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