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* [PATCH 0/7] mm: Page fault enhancements
@ 2019-06-28 10:44 Peter Xu
  2019-06-28 10:44 ` [PATCH 1/7] mm/gup: Rename "nonblocking" to "locked" where proper Peter Xu
                   ` (6 more replies)
  0 siblings, 7 replies; 8+ messages in thread
From: Peter Xu @ 2019-06-28 10:44 UTC (permalink / raw)
  To: linux-kernel
  Cc: David Hildenbrand, Hugh Dickins, Maya Gokhale, Jerome Glisse,
	Pavel Emelyanov, Johannes Weiner, peterx, Martin Cracauer,
	Shaohua Li, Marty McFadden, Andrea Arcangeli, Mike Kravetz,
	Denis Plotnikov, Mike Rapoport, Linus Torvalds, Mel Gorman,
	Kirill A . Shutemov, Dr . David Alan Gilbert

This series is split out of userfaultfd-wp series to only cover the
general page fault changes, since it seems to make sense itself.

Basically it does two things:

  (a) Allows the page fault handlers to be more interactive on not
      only SIGKILL, but also the rest of userspace signals (especially
      for user-mode faults), and,

  (b) Allows the page fault retry (VM_FAULT_RETRY) to happen for more
      than once.

I'm keeping the CC list as in uffd-wp v5, hopefully I'm not sending
too much spams...

And, instead of writting again the cover letter, I'm just copy-pasting
my previous link here which has more details on why we do this:

  https://patchwork.kernel.org/cover/10691991/

The major change from that latest version should be that we introduced
a new page fault flag FAULT_FLAG_INTERRUPTIBLE as suggested by Linus
[1] to represents that we would like the fault handler to respond to
non-fatal signals.  Also, we're more careful now on when to do the
immediate return of the page fault for such signals.  For example, now
we'll only check against signal_pending() for user-mode page faults
and we keep the kernel-mode page fault patch untouched for it.  More
information can be found in separate patches.

The patchset is only lightly tested on x86.

All comments are greatly welcomed.  Thanks,

[1] https://lkml.org/lkml/2019/6/25/1382

Peter Xu (7):
  mm/gup: Rename "nonblocking" to "locked" where proper
  mm: Introduce FAULT_FLAG_DEFAULT
  mm: Introduce FAULT_FLAG_INTERRUPTIBLE
  mm: Return faster for non-fatal signals in user mode faults
  userfaultfd: Don't retake mmap_sem to emulate NOPAGE
  mm: Allow VM_FAULT_RETRY for multiple times
  mm/gup: Allow VM_FAULT_RETRY for multiple times

 arch/alpha/mm/fault.c           |  7 +--
 arch/arc/mm/fault.c             | 17 ++-----
 arch/arm/mm/fault.c             | 14 +++---
 arch/arm64/mm/fault.c           | 16 +++----
 arch/hexagon/mm/vm_fault.c      |  6 +--
 arch/ia64/mm/fault.c            |  6 +--
 arch/m68k/mm/fault.c            | 10 ++--
 arch/microblaze/mm/fault.c      |  6 +--
 arch/mips/mm/fault.c            |  6 +--
 arch/nds32/mm/fault.c           | 12 ++---
 arch/nios2/mm/fault.c           |  8 ++--
 arch/openrisc/mm/fault.c        |  6 +--
 arch/parisc/mm/fault.c          |  9 ++--
 arch/powerpc/mm/fault.c         | 10 ++--
 arch/riscv/mm/fault.c           | 12 ++---
 arch/s390/mm/fault.c            | 11 ++---
 arch/sh/mm/fault.c              |  7 ++-
 arch/sparc/mm/fault_32.c        |  5 +-
 arch/sparc/mm/fault_64.c        |  6 +--
 arch/um/kernel/trap.c           |  7 +--
 arch/unicore32/mm/fault.c       | 11 ++---
 arch/x86/mm/fault.c             |  6 +--
 arch/xtensa/mm/fault.c          |  6 +--
 drivers/gpu/drm/ttm/ttm_bo_vm.c | 12 +++--
 fs/userfaultfd.c                | 28 +-----------
 include/linux/mm.h              | 81 +++++++++++++++++++++++++++++----
 include/linux/sched/signal.h    | 12 +++++
 mm/filemap.c                    |  2 +-
 mm/gup.c                        | 61 ++++++++++++++-----------
 mm/hugetlb.c                    | 14 +++---
 mm/shmem.c                      |  2 +-
 31 files changed, 226 insertions(+), 190 deletions(-)

-- 
2.21.0


^ permalink raw reply	[flat|nested] 8+ messages in thread
end of thread, other threads:[~2019-06-28 10:46 UTC | newest]

Thread overview: 8+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-06-28 10:44 [PATCH 0/7] mm: Page fault enhancements Peter Xu
2019-06-28 10:44 ` [PATCH 1/7] mm/gup: Rename "nonblocking" to "locked" where proper Peter Xu
2019-06-28 10:44 ` [PATCH 2/7] mm: Introduce FAULT_FLAG_DEFAULT Peter Xu
2019-06-28 10:44 ` [PATCH 3/7] mm: Introduce FAULT_FLAG_INTERRUPTIBLE Peter Xu
2019-06-28 10:44 ` [PATCH 4/7] mm: Return faster for non-fatal signals in user mode faults Peter Xu
2019-06-28 10:44 ` [PATCH 5/7] userfaultfd: Don't retake mmap_sem to emulate NOPAGE Peter Xu
2019-06-28 10:44 ` [PATCH 6/7] mm: Allow VM_FAULT_RETRY for multiple times Peter Xu
2019-06-28 10:44 ` [PATCH 7/7] mm/gup: " Peter Xu

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