Benjamin Herrenschmidt <b...@kernel.crashing.org> writes: > On Mon, 2015-11-23 at 15:52 +0530, Aneesh Kumar K.V wrote: >> This patch series attempt to update book3s 64 linux page table format to >> make it more flexible. Our current pte format is very restrictive and we >> overload multiple pte bits. This is due to the non-availability of free bits >> in pte_t. We use pte_t to track the validity of 4K subpages. This patch >> series free up pte_t of 11 bits by moving 4K subpage tracking to the >> lower half of PTE page. The pte format is updated such that we have a >> better method for identifying a pte entry at pmd level. This will also enable >> us to implement hugetlb migration(not yet done in this series). >> >> Before making the changes to the pte format, I am splitting the >> pte header definition such that we now have the below layout for headers > > This series actually completely removes the tracking of the subages, > right ? IE, it also halves the memory footprint of page tables, doesn't > it ? >
No, that is done in the next series. http://mid.gmane.org/1448274825-30289-1-git-send-email-aneesh.ku...@linux.vnet.ibm.com -aneesh _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev