svn commit: r233097 - head/sys/amd64/amd64

Nathan Whitehorn nwhitehorn at freebsd.org
Sat Mar 17 22:14:44 UTC 2012



On Mar 17, 2012, at 5:04 PM, Alan Cox wrote:

> Author: alc
> Date: Sat Mar 17 22:04:58 2012
> New Revision: 233097
> URL: http://svn.freebsd.org/changeset/base/233097
>
> Log:
>  With the changes over the past year to how accesses to the page's  
> dirty
>  field are synchronized, there is no need for pmap_protect() to  
> acquire
>  the page queues lock unless it is going to access the pv lists.
>
>  Reviewed by:	kib

Under what circumstances does the page queue lock actually have to be  
held? It looks like from this that I can remove the page queue lock  
from the PPC/AIM pmap_protect() completely, but I don't have a good  
sense of it.
-Nathan


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