login
Header Space

 
 

Re: Interaction between Xen and XFS: stray RW mappings

Score:
Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]
To: Andi Kleen <andi@...>
Cc: Nick Piggin <nickpiggin@...>, David Chinner <dgc@...>, Jeremy Fitzhardinge <jeremy@...>, <xfs@...>, Xen-devel <xen-devel@...>, Linux Kernel Mailing List <linux-kernel@...>, Mark Williamson <mark.williamson@...>, Morten <xen-users@...>, <xfs-masters@...>
Date: Sunday, October 21, 2007 - 6:16 pm

On Mon, 2007-10-15 at 13:07 +0200, Andi Kleen wrote:

The problem exist also on ppc, and afaik, is due to the line being in
the cache at all (either dirty (write) or not (read)), thus causing the
snoop logic to hit, that is what's causing the problem vs. non cached
accesses.

Also, on some processors, the simple fact of having the page mapped can
cause the CPU to prefetch from it even if it's not actually accessed
(speculative prefetch can cross page boundaries if things are mapped).

Ben.


-
Previous message: [thread] [date] [author]
Next message: [thread] [date] [author]

Messages in current thread:
Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Fri Oct 12, 12:58 pm)
Re: Interaction between Xen and XFS: stray RW mappings, David Chinner, (Sun Oct 14, 6:56 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Nick Piggin, (Mon Oct 15, 10:56 am)
Re: Interaction between Xen and XFS: stray RW mappings, Benjamin Herrenschmidt, (Sun Oct 21, 6:16 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Nick Piggin, (Mon Oct 15, 7:28 am)
Re: Interaction between Xen and XFS: stray RW mappings, Dave Airlie, (Sun Oct 21, 8:17 am)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Sun Oct 14, 7:12 pm)
Re: Interaction between Xen and XFS: stray RW mappings, David Chinner, (Sun Oct 14, 7:33 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Nick Piggin, (Mon Oct 15, 12:15 am)
Re: Interaction between Xen and XFS: stray RW mappings, dean gaudet, (Sun Oct 21, 11:18 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Sun Oct 21, 11:34 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Mon Oct 22, 2:40 pm)
Re: Interaction between Xen and XFS: stray RW mappings, David Chinner, (Mon Oct 22, 6:32 pm)
Re: Interaction between Xen and XFS: stray RW mappings, David Chinner, (Mon Oct 22, 8:36 pm)
Re: [PATCH] Allow lazy unmapping by taking extra page refere..., Jeremy Fitzhardinge, (Wed Oct 24, 1:08 am)
Re: [PATCH] Allow lazy unmapping by taking extra page refere..., Jeremy Fitzhardinge, (Wed Oct 24, 6:46 pm)
Re: [patch] Re: Interaction between Xen and XFS: stray RW ma..., Jeremy Fitzhardinge, (Tue Oct 23, 10:33 am)
Re: Interaction between Xen and XFS: stray RW mappings, Zachary Amsden, (Mon Oct 22, 8:16 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Mon Oct 22, 3:11 pm)
Re: Interaction between Xen and XFS: stray RW mappings, dean gaudet, (Mon Oct 22, 12:28 am)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Mon Oct 22, 2:32 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Nick Piggin, (Mon Oct 22, 12:39 am)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Mon Oct 22, 2:37 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Sun Oct 14, 8:57 pm)
Re: Interaction between Xen and XFS: stray RW mappings, Nick Piggin, (Mon Oct 15, 3:26 am)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Sun Oct 14, 11:42 pm)
Re: Interaction between Xen and XFS: stray RW mappings, David Chinner, (Mon Oct 15, 12:11 am)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Mon Oct 15, 12:18 am)
Re: Interaction between Xen and XFS: stray RW mappings, David Chinner, (Mon Oct 15, 12:25 am)
Re: [xfs-masters] Re: Interaction between Xen and XFS: stray..., Christoph Hellwig, (Mon Oct 15, 4:31 am)
Re: Interaction between Xen and XFS: stray RW mappings, Jeremy Fitzhardinge, (Fri Oct 12, 1:08 pm)
speck-geostationary