git: kernel - pmap and vkernel work

[Matthew Dillon]

commit 76f1911e607287d1cad1cece8db8d5d9bae6ca23
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Mon Jan 23 12:20:23 2017 -0800

    kernel - pmap and vkernel work
    
    * Remove the pmap.pm_token entirely.  The pmap is currently protected
      primarily by fine-grained locks and the vm_map lock.  The intention
      is to eventually be able to protect it without the vm_map lock at all.
    
    * Enhance pv_entry acquisition (representing PTE locations) to include
      a placemarker facility for non-existant PTEs, allowing the PTE location
      to be locked whether a pv_entry exists for it or not.
    
    * Fix dev_dmmap (struct dev_mmap) (for future use), it was returning a
      page index for physical memory as a 32-bit integer instead of a 64-bit
      integer.
    
    * Use pmap_kextract() instead of pmap_extract() where appropriate.
    
    * Put the token contention test back in kern_clock.c for real kernels
      so token contention shows up as sys% instead of idle%.
    
    * Modify the pmap_extract() API to also return a locked pv_entry,
      and add pmap_extract_done() to release it.  Adjust users of
      pmap_extract().
    
    * Change madvise/mcontrol MADV_INVAL (used primarily by the vkernel)
      to use a shared vm_map lock instead of an exclusive lock.  This
      significantly improves the vkernel's performance and significantly
      reduces stalls and glitches when typing in one under heavy loads.
    
    * The new placemarkers also have the side effect of fixing several
      difficult-to-reproduce bugs in the pmap code, by ensuring that
      shared and unmanaged pages are properly locked whereas before only
      managed pages (with pv_entry's) were properly locked.
    
    * Adjust the vkernel's pmap code to use atomic ops in numerous places.
    
    * Rename the pmap_change_wiring() call to pmap_unwire().  The routine
      was only being used to unwire (and could only safely be called for
      unwiring anyway).  Remove the unused 'wired' and the 'entry'
      arguments.
    
      Also change how pmap_unwire() works to remove a small race condition.
    
    * Fix race conditions in the vmspace_*() system calls which could lead
      to pmap corruption.  Note that the vkernel did not trigger any of
      these conditions, I found them while looking for another bug.
    
    * Add missing maptypes to procfs's /proc/*/map report.

Summary of changes:
 sys/bus/isa/vga_isa.c                            |   3 +-
 sys/bus/isa/x86_64/isa_dma.c                     |   4 +-
 sys/cpu/x86_64/include/types.h                   |   1 +
 sys/emulation/ndis/subr_ntoskrnl.c               |   4 +-
 sys/kern/kern_clock.c                            |  16 +-
 sys/kern/kern_device.c                           |   2 +-
 sys/kern/subr_sglist.c                           |  27 +-
 sys/platform/pc64/include/pmap.h                 |  12 +-
 sys/platform/pc64/x86_64/busdma_machdep.c        |   2 +-
 sys/platform/pc64/x86_64/pmap.c                  | 974 ++++++++++++++---------
 sys/platform/pc64/x86_64/vm_machdep.c            |   2 +-
 sys/platform/vkernel64/include/pmap.h            |   1 -
 sys/platform/vkernel64/platform/busdma_machdep.c |   2 +-
 sys/platform/vkernel64/platform/pmap.c           |  76 +-
 sys/platform/vkernel64/x86_64/vm_machdep.c       |   6 +-
 sys/sys/device.h                                 |   4 +-
 sys/sys/globaldata.h                             |   3 +-
 sys/sys/vkernel.h                                |   9 +-
 sys/vfs/procfs/procfs_map.c                      |  16 +-
 sys/vm/device_pager.c                            |   3 +-
 sys/vm/pmap.h                                    |   6 +-
 sys/vm/vm_contig.c                               |   2 +-
 sys/vm/vm_fault.c                                |  27 +-
 sys/vm/vm_map.c                                  |  92 ++-
 sys/vm/vm_object.c                               |   3 +-
 sys/vm/vm_object.h                               |   2 +-
 sys/vm/vm_vmspace.c                              | 185 +++--
 27 files changed, 919 insertions(+), 565 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/76f1911e607287d1cad1cece8db8d5d9bae6ca23


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