git: kernel - Move action_list out of vm_page, and change flags from 16->32 bits

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 906c754ce7d9e9b435f77dba229ad08f65d2ea4a
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date:   Tue Sep 28 16:16:05 2010 -0700

    kernel - Move action_list out of vm_page, and change flags from 16->32 bits
    
    * vm_page->action_list removed, saving 16 bytes per vm_page on x86_64
      (8 on i386).  Instead we add a flag to vm_page->flags, PG_ACTIONLIST,
      and store the action registrations in a global hash table.
    
    * Change vm_page->flags from a 16 to 32 bits, plus pad, adding 4 bytes
      to the vm_page structure.
    
    * x86_64 sizeof(struct vm_page) goes from 136 to 128, keeping in mind
      that it grew from 132 to 136 with the addition of ku_pagecnt.  So,
      net-net, we have still managed to decrease the size of struct vm_page
      by a little.

Summary of changes:
 sys/kern/kern_umtx.c |    6 ++--
 sys/vm/vm_page.c     |   83 ++++++++++++++++++++++++++++++++++++++++++++++---
 sys/vm/vm_page.h     |   45 +++++++++++++++------------
 sys/vm/vm_page2.h    |   24 ++------------
 4 files changed, 108 insertions(+), 50 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/906c754ce7d9e9b435f77dba229ad08f65d2ea4a


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