Re: Interaction between Xen and XFS: stray RW mappings

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To: Nick Piggin <nickpiggin@...>

Cc: Jeremy Fitzhardinge <jeremy@...>, David Chinner <dgc@...>, <xfs@...>, Xen-devel <xen-devel@...>, Linux Kernel Mailing List <linux-kernel@...>, Mark Williamson <mark.williamson@...>, Morten Bøgeskov <xen-users@...>, <xfs-masters@...>

Subject: Re: Interaction between Xen and XFS: stray RW mappings

Date: Sunday, October 21, 2007 - 11:18 pm

On Mon, 15 Oct 2007, Nick Piggin wrote:

quoted text> Yes, as Dave said, vmap (more specifically: vunmap) is very expensive
> because it generally has to invalidate TLBs on all CPUs.

why is that?  ignoring 32-bit archs we have heaps of address space 
available... couldn't the kernel just burn address space and delay global 
TLB invalidate by some relatively long time (say 1 second)?

-dean
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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, Andi Kleen, (Mon Oct 15, 5:36 am)

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, Andi Kleen, (Mon Oct 15, 7:07 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, Andi Kleen, (Mon Oct 22, 5:49 am)

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, Andi Kleen, (Mon Oct 15, 8:54 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, Andi Kleen, (Mon Oct 22, 9:47 am)

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, Andi Kleen, (Mon Oct 22, 3:07 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, Andi Kleen, (Mon Oct 22, 7:35 pm)

Re: Interaction between Xen and XFS: stray RW mappings, David Chinner, (Mon Oct 22, 8:36 pm)

Re: Interaction between Xen and XFS: stray RW mappings, Andi Kleen, (Tue Oct 23, 5:28 am)

[patch] Re: Interaction between Xen and XFS: stray RW mappings, David Chinner, (Tue Oct 23, 3:04 am)

Re: [patch] Re: Interaction between Xen and XFS: stray RW ma..., Andi Kleen, (Tue Oct 23, 5:30 am)

[PATCH] Allow lazy unmapping by taking extra page references..., David Chinner, (Wed Oct 24, 12:36 am)

Re: [PATCH] Allow lazy unmapping by taking extra page refere..., Jeremy Fitzhardinge, (Wed Oct 24, 1:08 am)

[PATCH] Allow lazy unmapping by taking extra page references..., David Chinner, (Wed Oct 24, 5:48 pm)

Re: [PATCH] Allow lazy unmapping by taking extra page refere..., Jeremy Fitzhardinge, (Wed Oct 24, 6:46 pm)

Re: [PATCH] Allow lazy unmapping by taking extra page refere..., David Chinner, (Wed Oct 24, 7:21 pm)

Re: [patch] Re: Interaction between Xen and XFS: stray RW ma..., David Chinner, (Tue Oct 23, 8:41 am)

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)

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