svn commit: r196615 - in head/sys: kern sys vm

John Baldwin jhb at
Fri Aug 28 14:24:04 UTC 2009

On Friday 28 August 2009 10:06:56 am John Baldwin wrote:
> Author: jhb
> Date: Fri Aug 28 14:06:55 2009
> New Revision: 196615
> URL:
> Log:
>   Extend the device pager to support different memory attributes on different
>   pages in an object.
>   - Add a new variant of d_mmap() currently called d_mmap2() which accepts
>     an additional in/out parameter that is the memory attribute to use for
>     the requested page.
>   - A driver either uses d_mmap() or d_mmap2() for all requests but not both.
>     The current implementation uses a flag in the cdevsw (D_MMAP2) to indicate
>     that the driver provides a d_mmap2() handler instead of d_mmap().  This
>     is done to make the change ABI compatible with existing drivers and
>     MFC'able to 7 and 8.

The future plan for 9.0 is to just convert d_mmap() to the newer API/ABI and
remove d_mmap2().  However, the current version of this patch is MFC'able
without need changes to drivers that do not use the new parameter.

John Baldwin

More information about the svn-src-all mailing list