[PATCH 0/5] get_user_pages_locked|unlocked v1

[Andrea Arcangeli]

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(-)
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