Subject: Re: 4MB pages?
To: Eduardo Horvath <>
From: Jason R Thorpe <>
List: tech-kern
Date: 09/06/2000 10:17:22
On Wed, Sep 06, 2000 at 09:52:30AM -0700, Eduardo Horvath wrote:

 > The real problems are deciding when to split a page, either for
 > ref/mod accounting because a portion has been touched, or there are
 > multiple mappings of only portions of a large page.  For this we need UVM
 > support, which is a nastier issue.

Right, which is why the pmap should use the default page size unless
a different one is explicitly requested by UVM.  Like I said, for
unmanaged pages, this is really easy, because you don't have to worry
about splitting...

        -- Jason R. Thorpe <>