svn commit: r197750 - head/sys/vm

[John Baldwin]

Alan Cox wrote:
> Author: alc
> Date: Sun Oct  4 18:53:10 2009
> New Revision: 197750
> URL: http://svn.freebsd.org/changeset/base/197750
> 
> Log:
>   Align and pad the page queue and free page queue locks so that the linker
>   can't possibly place them together within the same cache line.
>   
>   MFC after:	3 weeks
> 
> Modified:
>   head/sys/vm/vm_page.c
>   head/sys/vm/vm_page.h
> 
> Modified: head/sys/vm/vm_page.c
> ==============================================================================
> --- head/sys/vm/vm_page.c	Sun Oct  4 17:22:51 2009	(r197749)
> +++ head/sys/vm/vm_page.c	Sun Oct  4 18:53:10 2009	(r197750)
> @@ -135,8 +135,8 @@ __FBSDID("$FreeBSD$");
>   */
>  
>  struct vpgqueues vm_page_queues[PQ_COUNT];
> -struct mtx vm_page_queue_mtx;
> -struct mtx vm_page_queue_free_mtx;
> +struct vpglocks vm_page_queue_lock;
> +struct vpglocks vm_page_queue_free_lock;

I think you can do this by just:

struct mtx vm_page_queue_mtx __aligned(CACHE_LINE_SIZE);

without the need for a wrapper structure.

-- 
John Baldwin