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 -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>