hi Raj, as u said, I can have a pfn by pfn = pa >> PAGE_SHIFT; and then I move a page pointer to the address of corresponding node_mem_map by calling pfn_to_page like following: page *mypage; mypage = pfn_to_page(pfn); but I can't access the "virtual" filed, cuz it is defined in inside a #if - #endit section (in 2.6.7 kernel) #if defined(WANT_PAGE_VIRTUAL) void *virtual; /* Kernel virtual address (NULL if not kmapped, ie. highmem) */ #endif /* WANT_PAGE_VIRTUAL */ for 2.4.x #if defined(CONFIG_HIGHMEM) || defined(WANT_PAGE_VIRTUAL) void *virtual; #endif /* CONFIG_HIGMEM || WANT_PAGE_VIRTUAL */ does it mean that the virtual-field is activated (and can be asscessed) if and only if the HIGHMEN configured and starts to allocate memory dynamically? > Again as far as I know, to access the virtual address for a given > physical address, you need to access the rmap structure in the struct > page. This how you can do it, > > physical address >> PAGE_SHIFT , this gives you the pfn > > node_mem_map + pfn gives the struct page pointer value. > > Acess the rmap structure in the page structure. This is a list of all > the virtual addresses where this page is mapped. > > Please correct me if I am wrong. > > -------------- > Raj. > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
