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' And similar. cheers -- 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>