This patchset standalone is an optimization leveraging the page fault FAULT_FLAG_ALLOW_RETRY flag which allows the page fault paths to drop the mmap_sem before I/O. For the userfaultfd patchset this patch is instead a dependency as we need that flag always set the first time any thread attempts a page fault, in order to release the mmap_sem before stopping the page fault (while waiting for a later userland wakeup). http://thread.gmane.org/gmane.linux.kernel.mm/123575 Andrea Arcangeli (5): mm: gup: add get_user_pages_locked and get_user_pages_unlocked mm: gup: add __get_user_pages_unlocked to customize gup_flags mm: gup: use get_user_pages_unlocked within get_user_pages_fast mm: gup: use get_user_pages_unlocked mm: gup: kvm use get_user_pages_unlocked arch/mips/mm/gup.c | 8 +- arch/powerpc/mm/gup.c | 6 +- arch/s390/mm/gup.c | 6 +- arch/sh/mm/gup.c | 6 +- arch/sparc/mm/gup.c | 6 +- arch/x86/mm/gup.c | 7 +- drivers/iommu/amd_iommu_v2.c | 6 +- drivers/media/pci/ivtv/ivtv-udma.c | 6 +- drivers/scsi/st.c | 7 +- drivers/video/fbdev/pvr2fb.c | 6 +- include/linux/kvm_host.h | 11 -- include/linux/mm.h | 11 ++ mm/gup.c | 203 ++++++++++++++++++++++++++++++++++--- mm/nommu.c | 33 ++++++ mm/process_vm_access.c | 7 +- mm/util.c | 10 +- net/ceph/pagevec.c | 6 +- virt/kvm/async_pf.c | 2 +- virt/kvm/kvm_main.c | 50 +-------- 19 files changed, 265 insertions(+), 132 deletions(-) -- 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>