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Re: [Xen-devel] [XEN PATCH v1 1/1] x86/vm_event: add fast single step
- To: Sergey Kovalev <valor@xxxxxxx>, <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
- Date: Tue, 17 Dec 2019 14:48:12 +0000
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- Cc: Petre Pircalabu <ppircalabu@xxxxxxxxxxxxxxx>, Tamas K Lengyel <tamas@xxxxxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, Jan Beulich <jbeulich@xxxxxxxx>, Alexandru Isaila <aisaila@xxxxxxxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 17 Dec 2019 14:48:47 +0000
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- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
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On 17/12/2019 14:40, Sergey Kovalev wrote:
> On break point event eight context switches occures.
>
> With fast single step it is possible to shorten path for two context
> switches
> and gain 35% spead-up.
>
> Was tested on Debian branch of Xen 4.12. See at:
> https://github.com/skvl/xen/tree/debian/knorrie/4.12/fast-singlestep
>
> Rebased on master:
> https://github.com/skvl/xen/tree/fast-singlestep
>
> Signed-off-by: Sergey Kovalev <valor@xxxxxxx>
35% looks like a good number, but what is "fast single step"? All this
appears to be is plumbing for to cause an altp2m switch on single step.
~Andrew
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