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xen-devel
[Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction ab
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benh@xxxxxxxxxxxxxxxxxxx |
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Subject: |
[Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction |
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From: |
Jeremy Fitzhardinge <jeremy@xxxxxxxx> |
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Date: |
Wed, 18 Jun 2008 16:59:05 -0700 |
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Zachary Amsden <zach@xxxxxxxxxx>, Rusty Russell <rusty@xxxxxxxxxxxxxxx>, xen-devel <xen-devel@xxxxxxxxxxxxxxxxxxx>, Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>, kvm-devel <kvm-devel@xxxxxxxxxxxxxxxxxxxxx>, x86@xxxxxxxxxx, LKML <linux-kernel@xxxxxxxxxxxxxxx>, Virtualization Mailing List <virtualization@xxxxxxxxxxxxxx>, Hugh Dickins <hugh@xxxxxxxxxxx>, Ingo Molnar <mingo@xxxxxxx>, Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx> |
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Wed, 18 Jun 2008 17:00:13 -0700 |
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Benjamin Herrenschmidt wrote:
On Mon, 2008-06-16 at 04:30 -0700, Jeremy Fitzhardinge wrote:
The only current user of this interface is mprotect
Do you plan to use it with fork ultimately ?
Good point, I'd overlooked that. I guess that means using it in
ptep_set_wrprotect().
At present the x86 ptep_set_wrprotect() just uses clear_bit on the pte,
which is a locked cycle. Is that significantly cheaper than an xchg +
set? (Same number of locked operations...)
J
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- [Xen-devel] [PATCH 0 of 4] mm+paravirt+xen: add pte read-modify-write abstraction (take 2), Jeremy Fitzhardinge
- [Xen-devel] [PATCH 3 of 4] xen: implement ptep_modify_prot_start/commit, Jeremy Fitzhardinge
- [Xen-devel] [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Jeremy Fitzhardinge
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- [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Jeremy Fitzhardinge
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- [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Ingo Molnar
- [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Ingo Molnar
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- [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Ingo Molnar
- [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Jeremy Fitzhardinge
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- [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Ingo Molnar
- [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Jeremy Fitzhardinge
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- [Xen-devel] Re: [PATCH 1 of 4] mm: add a ptep_modify_prot transaction abstraction, Jeremy Fitzhardinge
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