These 3 changes are to improve the handling of large mm_populate and munlock operations. They apply on top of mmotm (in particular, they depend on both my prior mm_populate work and Kirill's "thp: avoid dumping huge zero page" change). - Patch 1 fixes an integer overflow issue when populating 2^32 pages. The nr_pages argument to get_user_pages would overflow, resulting in 0 pages being processed per iteration. I am proposing to simply convert the nr_pages argument to a long. - Patch 2 accelerates populating regions with THP pages. get_user_pages() can increment the address by a huge page size in this case instead of a small page size, and avoid repeated mm->page_table_lock acquisitions. This fixes an issue reported by Roman Dubtsov where populating regions via mmap MAP_POPULATE was significantly slower than doing so by touching pages from userspace. - Patch 3 is a similar acceleration for the munlock case. I would actually like to get Andrea's attention on this one, as I can't explain how munlock_vma_page() is safe against racing with split_huge_page(). Note that patches 1-2 are logically independent of patch 3, so if the discussion of patch 3 takes too long I would ask Andrew to consider merging patches 1-2 first. Michel Lespinasse (3): mm: use long type for page counts in mm_populate() and get_user_pages() mm: accelerate mm_populate() treatment of THP pages mm: accelerate munlock() treatment of THP pages arch/ia64/xen/xencomm.c | 3 ++- arch/powerpc/kernel/vdso.c | 9 +++++---- arch/s390/mm/pgtable.c | 3 ++- include/linux/hugetlb.h | 6 +++--- include/linux/mm.h | 16 ++++++++-------- mm/hugetlb.c | 10 +++++----- mm/internal.h | 2 +- mm/ksm.c | 10 +++++++--- mm/memory.c | 39 ++++++++++++++++++++++++++------------- mm/migrate.c | 7 +++++-- mm/mlock.c | 37 ++++++++++++++++++++++++------------- 11 files changed, 88 insertions(+), 54 deletions(-) -- 1.8.1 -- 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>