lkml.org 
[lkml]   [2007]   [Apr]   [20]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [RFC 7/8] Enhance ramfs to support higher order pages
On Fri, 20 Apr 2007, William Lee Irwin III wrote:
>
> On Fri, Apr 20, 2007 at 09:30:30AM -0700, Christoph Lameter wrote:
> > We can map arbitrary 4k chunks of larger pages.
>
> The core VM can do that but the hugetlb architectural code can't fall
> back to smaller page sizes. It also should not be put into a situation
> where it needs to do so given the semantics it must honor.

Wel we could potentially add a handle_pmd_fault to the vm...?

> Also, the final assertion is inaccurate. Fault handlers must instantiate
> pages of order mapping->order when faulting in a page of a file with
> a given pagecache size. The semantics of faulting and mmap()'ing are

Why? I agree that the page state of the higher order page must be updated
consistently but one can use a pte to map a 4k chunk of a higher
order page.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2007-04-20 19:17    [W:0.991 / U:0.676 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site