On Fri, 2013-11-22 at 10:46 +1100, Benjamin Herrenschmidt wrote: > On Fri, 2013-11-22 at 09:11 +1100, Paul Mackerras wrote: > > On Thu, Nov 21, 2013 at 10:17:55AM +0800, Liu Ping Fan wrote: > > > For 64K page, we waste half of the pte_t page. With this patch, after > > > changing PGD_INDEX_SIZE from 12 to 11, PTE_INDEX_SIZE from 8 to 9, > > > we can improve the usage of pte_t page and shrink the continuous phys > > > size for pgd_t. > > Also you did you miss that we use the second half to store the > per-subpage hash info when using 64k on top of HW 4k ?
Given the subtleties perhaps a nice big block comment is in order ? :) cheers _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
