git: kernel - Beef up vm_contig allocation checks

[Matthew Dillon <dillon@xxxxxxxxxxxxxxxxxxxxxxx>]

commit 709f5959ae62a1025786662a7da3c5e1ace58805
Author: Matthew Dillon <dillon@apollo.backplane.com>
Date:   Tue Nov 8 15:38:16 2011 -0800

    kernel - Beef up vm_contig allocation checks
    
    * Beef up vm_contig allocation checks by also requiring the PQ_CACHE page
      to not be held or wired or unmanaged, and assert that it is not mapped
      or dirty.
    
    * When utilizing PQ_FREE pages ignore any held pages and assert that
      the pages are not dirty in addition to not having an object.
    
    * Do not clear PG_SBUSY when allocating a page (though it shouldn't be set
      anyway, we still shouldn't unconditionally clear the bit).

Summary of changes:
 sys/vm/vm_contig.c |   15 ++++++++++++---
 1 files changed, 12 insertions(+), 3 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/709f5959ae62a1025786662a7da3c5e1ace58805


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