git: kernel - Fix swap issue, implement dynamic pmap PT/PD/PDP deletion (3)

[Matthew Dillon]

commit 582f286d9b439958aa7c4f1df9cd14b05ec24e50
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Fri Jan 6 16:04:32 2017 -0800

    kernel - Fix swap issue, implement dynamic pmap PT/PD/PDP deletion (3)
    
    * More pmap fixes.  Fix a bug introduced by the original commit that
      could still create managed PT/PD/PDP page tables in kernel_pmap when
      doing a wiring change.
    
    * Assert that we never create managed PT/PD/PDP page tables in kernel_pmap.
      Managed PTEs can still be created (e.g. for pageable kernel memory).
    
    * Add sysctl pmap_dynamic_delete, which defaults to enabled.  This sysctl
      can be set to 0 to disable dynamic deletion of PT/PD/PDP pages in user
      pmaps.

Summary of changes:
 sys/platform/pc64/x86_64/pmap.c | 85 ++++++++++++++++++++++++++++++-----------
 1 file changed, 62 insertions(+), 23 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/582f286d9b439958aa7c4f1df9cd14b05ec24e50


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