Re: [Xen-devel] [v4 16/17] vmx: Add some scheduler hooks for VT-d posted interrupts

["Wu, Feng" <feng.wu@xxxxxxxxx>]

> -----Original Message-----
> From: Dario Faggioli [mailto:dario.faggioli@xxxxxxxxxx]
> Sent: Thursday, July 23, 2015 8:50 PM
> To: Wu, Feng
> Cc: xen-devel@xxxxxxxxxxxxx; Tian, Kevin; Keir Fraser; George Dunlap; Andrew
> Cooper; Jan Beulich
> Subject: Re: [Xen-devel] [v4 16/17] vmx: Add some scheduler hooks for VT-d
> posted interrupts
> 
> 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?

Yes, the issue has been fixed in this version.

> 
> 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?

Thanks for your effort, Dario! Maybe you can give a review about this
new version, if you have time.

Thanks,
Feng

> 
> 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.
> >
> > - vmx_post_ctx_switch_pi()
> > It is called after context switch, we update the posted
> > interrupt descriptor when the vCPU is going to run.
> >
> > - arch_vcpu_wake()
> > It will be called when waking up the vCPU, we update
> > the posted interrupt descriptor when the vCPU is unblocked.
> 
> --
> <<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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