git: kernel - Remove unneeded map token use from the vm_fault path.

[Matthew Dillon]

commit 73101af2cf10ca65e7be85f900483f9393940d23
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Sun Feb 5 18:56:45 2017 -0800

    kernel - Remove unneeded map token use from the vm_fault path.
    
    * vm_fault() and vm_fault_page() does not need to hold the map_token.
      They already hold the standard vm_map lock.
    
    * This improves re-faulting in a multi-threaded environment, resulting
      in a fully shared-lock and essentially uncontended path.  It will not
      improve initial faulting where a vm_page has to be allocated into the
      backing vm_object (which requires an exclusive object token).

Summary of changes:
 sys/vm/vm_fault.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/73101af2cf10ca65e7be85f900483f9393940d23


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