git: kernel - Add minor VM shortcuts

[Matthew Dillon]

commit 3a8f824874846b019083914ed34f2671461f2498
Author: Matthew Dillon <dillon at apollo.backplane.com>
Date:   Wed Mar 4 09:17:47 2020 -0800

    kernel - Add minor VM shortcuts
    
    * Adjust vm_page_hash_elm heuristic to save the full pindex field
      instead of just the lower 32 bits.
    
    * Refactor the hash table and hash lookup to index directly to the
      potential hit rather than masking to the SET size (~3).  This
      improves our chances of finding the requested page without having
      to iterate.
    
      The hash table is now N + SET sized and the SET iteration runs
      from the potential direct-hit point forwards.
    
    * Minor __predict* code optimizations.
    
    * Shortcut vm_page_alloc() when PG_MAPPED|PG_WRITEABLE are clear
      to avoid unnecessary code paths.

Summary of changes:
 sys/vm/vm_page.c | 64 +++++++++++++++++++++++++++++++++++---------------------
 1 file changed, 40 insertions(+), 24 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/3a8f824874846b019083914ed34f2671461f2498


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