linux-kernel - [RFC v3 00/17] Speculative page faults

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Date:   Thu, 27 Apr 2017 17:52:39 +0200
From:   Laurent Dufour <ldufour@...ux.vnet.ibm.com>
To:     paulmck@...ux.vnet.ibm.com, peterz@...radead.org,
        akpm@...ux-foundation.org, kirill@...temov.name,
        ak@...ux.intel.com, mhocko@...nel.org, dave@...olabs.net,
        jack@...e.cz
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        haren@...ux.vnet.ibm.com, khandual@...ux.vnet.ibm.com,
        npiggin@...il.com, bsingharora@...il.com
Subject: [RFC v3 00/17] Speculative page faults

This is a port on kernel 4.10 of the work done by Peter Zijlstra to
handle page fault without holding the mm semaphore.

http://linux-kernel.2935.n7.nabble.com/RFC-PATCH-0-6-Another-go-at-speculative-page-faults-tt965642.html#none

This series is functional on x86, but there may be some pending
issues. It's building on top of v4.10.

Compared to the Peter initial work, this series introduces a try spin
lock when dealing with speculative page fault. This is required to
avoid dead lock when handling a page fault while a TLB invalidate is
requested by an other CPU holding the PTE. Another change due to a
lock dependency issue with mapping->i_mmap_rwsem.

This series also protect changes to VMA's data which are read or
change by the page fault handler. The protections is done through the
VMA's sequence number.

Laurent Dufour (11):
  mm: Introduce pte_spinlock
  mm/spf: Try spin lock in speculative path
  mm/spf: Fix fe.sequence init in __handle_mm_fault()
  mm/spf: don't set fault entry's fields if locking failed
  mm/spf; fix lock dependency against mapping->i_mmap_rwsem
  mm/spf: Protect changes to vm_flags
  mm/spf Protect vm_policy's changes against speculative pf
  x86/mm: Update the handle_speculative_fault's path
  mm/spf: Add check on the VMA's flags
  mm: protect madvise vs speculative pf
  mm/spf: protect mremap() against speculative pf

Peter Zijlstra (6):
  mm: Dont assume page-table invariance during faults
  mm: Prepare for FAULT_FLAG_SPECULATIVE
  mm: VMA sequence count
  RCU free VMAs
  mm: Provide speculative fault infrastructure
  mm,x86: Add speculative pagefault handling

 arch/x86/mm/fault.c      |  15 +++
 fs/proc/task_mmu.c       |   2 +
 include/linux/mm.h       |   4 +
 include/linux/mm_types.h |   3 +
 kernel/fork.c            |   1 +
 mm/init-mm.c             |   1 +
 mm/internal.h            |  18 +++
 mm/madvise.c             |   5 +-
 mm/memory.c              | 284 +++++++++++++++++++++++++++++++++++++++--------
 mm/mempolicy.c           |  10 +-
 mm/mlock.c               |   9 +-
 mm/mmap.c                | 121 +++++++++++++++-----
 mm/mprotect.c            |   2 +
 mm/mremap.c              |   7 ++
 14 files changed, 402 insertions(+), 80 deletions(-)

-- 
2.7.4