svn commit: r310363 - stable/10/sys/vm

[Hiroshi Yoshida]

On Wed, 21 Dec 2016 11:32:09 +0000 (UTC)
Konstantin Belousov <kib at FreeBSD.org> wrote:

> Author: kib
> Date: Wed Dec 21 11:32:08 2016
> New Revision: 310363
> URL: https://svnweb.freebsd.org/changeset/base/310363
> 
> Log:
>   MFC r310098:
>   Provide introductory description of the default pager.
> 
> Modified:
>   stable/10/sys/vm/default_pager.c
> Directory Properties:
>   stable/10/   (props changed)
> 
> Modified: stable/10/sys/vm/default_pager.c
> ==============================================================================
> --- stable/10/sys/vm/default_pager.c	Wed Dec 21 09:59:55 2016	(r310362)
> +++ stable/10/sys/vm/default_pager.c	Wed Dec 21 11:32:08 2016	(r310363)
> @@ -63,6 +63,16 @@ static boolean_t default_pager_haspage(v
>  		int *);
>  /*
>   * pagerops for OBJT_DEFAULT - "default pager".
> + *
> + * This pager handles anonymous (no handle) swap-backed memory, just
> + * like the swap pager.  It allows several optimizations based on the
> + * fact that no pages of a default object can be swapped out.  The
> + * most important optimization is in vm_fault(), where the pager is
> + * never asked for a non-resident page.  Instead, a freshly allocated
> + * zeroed page is used.
> + *
> + * On the first request to page out a page from a default object, the
> + * object is converted to swap pager type.
>   */
>  struct pagerops defaultpagerops = {
>  	.pgo_alloc =	default_pager_alloc,
>

r310097 not need to merge it?

-- 
Hiroshi Yoshida