From mboxrd@z Thu Jan  1 00:00:00 1970
From: Dario Faggioli <dario.faggioli@citrix.com>
Subject: Re: [v4 16/17] vmx: Add some scheduler hooks for VT-d
 posted interrupts
Date: Thu, 23 Jul 2015 14:50:00 +0200
Message-ID: <1437655800.5036.76.camel@citrix.com>
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To: Feng Wu <feng.wu@intel.com>
Cc: Kevin Tian <kevin.tian@intel.com>, Keir Fraser <keir@xen.org>, George Dunlap <george.dunlap@eu.citrix.com>, Andrew Cooper <andrew.cooper3@citrix.com>, xen-devel@lists.xen.org, Jan Beulich <jbeulich@suse.com>
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On Thu, 2015-07-23 at 19:35 +0800, Feng Wu wrote:
> This patch adds the following arch hooks in scheduler:
>
So, preliminary question: does this mean that you have identified (and
fixed) the differences in behavior wrt the runstate based model, which
was causing performance issue?

I've been sidetracked a bit in looking at your previous patch, but did
found a couple of differences, which I was about to report... But I
guess that's no longer necessary, I guess, is it?

Dario

> - vmx_pre_ctx_switch_pi():
> It is called before context switch, we update the posted
> interrupt descriptor when the vCPU is preempted, go to sleep,
> or is blocked.
>=20
> - vmx_post_ctx_switch_pi()
> It is called after context switch, we update the posted
> interrupt descriptor when the vCPU is going to run.
>=20
> - arch_vcpu_wake()
> It will be called when waking up the vCPU, we update
> the posted interrupt descriptor when the vCPU is unblocked.

--=20
<<This happens because I choose it to happen!>> (Raistlin Majere)
-----------------------------------------------------------------
Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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