[GSoC] Defining Memory for MMU page tables at CSB337
Gedare Bloom
gedare at rtems.org
Tue Aug 7 14:25:19 UTC 2012
Yes I overlooked that point.. The "Why" factor.
The number of pages that can be used at one time is a concern for
creating either static or dynamic use of MMU. Using big pages allows
to have a finite number of pages and well-defined "zones" of memory.
Big pages also typically map onto the MMU's TLB directly. Small pages
may permit greater flexibility over the memory mapping, but lets a
developer shoot their foot by using more pages than the TLB can
support and thus induce page faults. We must avoid page faults.
On Tue, Aug 7, 2012 at 3:32 AM, Sebastian Huber
<sebastian.huber at embedded-brains.de> wrote:
> I don't think 2nd level MMU support makes sense for a real-time operating
> system.
>
> --
> Sebastian Huber, embedded brains GmbH
>
> Address : Obere Lagerstr. 30, D-82178 Puchheim, Germany
> Phone : +49 89 18 90 80 79-6
> Fax : +49 89 18 90 80 79-9
> E-Mail : sebastian.huber at embedded-brains.de
> PGP : Public key available on request.
>
> Diese Nachricht ist keine geschäftliche Mitteilung im Sinne des EHUG.
>
>
>
> _______________________________________________
> rtems-devel mailing list
> rtems-devel at rtems.org
> http://www.rtems.org/mailman/listinfo/rtems-devel
More information about the devel
mailing list