"Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> writes: > Michael Ellerman <michael@xxxxxxxxxxxxxx> writes: > >> On Thu, Apr 04, 2013 at 11:27:44AM +0530, Aneesh Kumar K.V wrote: >>> From: "Aneesh Kumar K.V" <aneesh.kumar@xxxxxxxxxxxxxxxxxx> >>> >>> We allocate one page for the last level of linux page table. With THP and >>> large page size of 16MB, that would mean we are wasting large part >>> of that page. To map 16MB area, we only need a PTE space of 2K with 64K >>> page size. This patch reduce the space wastage by sharing the page >>> allocated for the last level of linux page table with multiple pmd >>> entries. We call these smaller chunks PTE page fragments and allocated >>> page, PTE page. >> >> This is not compiling for me: >> >> arch/powerpc/mm/mmu_context_hash64.c:118:3: error: implicit declaration of function 'reset_page_mapcount' >> > > can you share the .config ? I have the git tree at > > git://github.com/kvaneesh/linux.git ppc64-thp-7 22b751c3d0376e86a377e3a0aa2ddbbe9d2eefc1 . Will rebase to latest linus tree. -aneesh -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>