cvs commit: src/sys/libkern mcount.c src/sys/machine/pc32/i386 pmap.c src/sys/machine/vkernel/platform pmap.c src/sys/vm vm_fault.c

Matthew Dillon dillon at
Fri Jan 12 14:17:29 PST 2007

dillon      2007/01/12 14:12:53 PST

DragonFly src repository

  Modified files:
    sys/libkern          mcount.c 
    sys/machine/pc32/i386 pmap.c 
    sys/machine/vkernel/platform pmap.c 
    sys/vm               vm_fault.c 
  Fix the recently committed (and described) page writability nerf.  The real
  kernel was unconditionally mapping writable pages read-only on read faults
  in order to be able to take another fault on a write attempt.  This was needed
  for early virtual kernel support in order to set the Modify bit in the
  virtualized page table, but was being applied to ALL mappings rather then
  just those installed by the virtual kernel.
  Now the real kernel only does this for virtual kernel mappings.  Additionally,
  the real kernel no longer makes the page read-only when clearing the Modify
  bit in the real page table (in order to rearm the write fault).  When this
  case occurs VPTE_M has already been set in the virtual page table and no
  re-fault is required.
  The virtual kernel now only needs to invalidate the real kernel's page
  mapping when clearing the virtualized Modify bit in the virtual page table
  (VPTE_M), in order to rearm the real kernel's write fault so it can detect
  future modifications via the virtualized Modify bit.  Also, the virtual kernel
  no longer needs to install read-only pages to detect the write fault.  This
  allows the real kernel to do ALL the work required to handle VPTE_M and
  make the actual page writable.  This greatly reduces the number of real
  page faults that occur and greatly reduces the number of page faults which
  have to be passed through to the virtual kernel.
  This fix reduces fork() overhead for processes running under a virtual
  kernel by 70%, from around 2100uS to around 650uS.
  Revision  Changes    Path
  1.9       +2 -0      src/sys/libkern/mcount.c
  1.71      +14 -10    src/sys/machine/pc32/i386/pmap.c
  1.13      +23 -15    src/sys/machine/vkernel/platform/pmap.c
  1.41      +2 -1      src/sys/vm/vm_fault.c

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