On Thu, 15 Oct 2009, Gerald Schaefer wrote: > > The pages allocated as __GFP_MOVABLE are used to store the list of pages > > allocated by the balloon. They reference virtual addresses and it would > > be fine for the kernel to migrate the physical pages for those, the > > balloon would not notice this. > > Does page migration really work for kernel pages that were allocated > with __get_free_page()? I was wondering if we can do this on s390, where > we have a 1:1 mapping of kernel virtual to physical addresses, but > looking at migrate_pages() and friends, it seems that kernel pages > w/o mapping and rmap should not be migrateable at all. Any thoughts from > the memory migration experts?
page migration only works for pages where we have some way of accounting for all the references to a page. This usually mean using reverse mappings (anon list, radix trees and page tables). _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
