From: Dario Faggioli <dario.faggioli@citrix.com>
To: "Wu, Feng" <feng.wu@intel.com>, Jan Beulich <JBeulich@suse.com>
Cc: "Tian, Kevin" <kevin.tian@intel.com>,
"keir@xen.org" <keir@xen.org>,
"george.dunlap@eu.citrix.com" <george.dunlap@eu.citrix.com>,
"andrew.cooper3@citrix.com" <andrew.cooper3@citrix.com>,
"xen-devel@lists.xen.org" <xen-devel@lists.xen.org>
Subject: Re: [PATCH 0/3] VMX: Properly handle pi descriptor and per-cpu blocking list
Date: Tue, 24 May 2016 16:46:34 +0200 [thread overview]
Message-ID: <1464101194.21930.115.camel@citrix.com> (raw)
In-Reply-To: <E959C4978C3B6342920538CF579893F0196ED828@SHSMSX103.ccr.corp.intel.com>
[-- Attachment #1.1: Type: text/plain, Size: 1500 bytes --]
On Tue, 2016-05-24 at 13:33 +0000, Wu, Feng wrote:
> > From: Wu, Feng
> > > From: Dario Faggioli [mailto:dario.faggioli@citrix.com]
> > >
> > > If a
> > > vCPU is blocker, there is nothing to do, and in fact, nothing
> > > happens
> > > (as vcpu_sleep_nosync() and vcpu_wake() are NOP in that case).
> > What do you mean by saying ' vcpu_sleep_nosync() and vcpu_wake()
> > are NOP '?
>
> I think I understand what you meant above now.
>
Right. In any case, see the email I've just sent, with a detailed
breakdown of the situation and of what actually happens.
> Do you think the following idea makes sense?
>
> When a pCPU is unplugged, we can just remove the vcpus on the
> associated per-cpu blocking list, then we can choose another online
> cpu, set the right NDST value, and put the vCPU the new per-cpu list?
>
Well, this does make sense to me, but the point is how you do that. I
mean, how do you get to execute some PI adjustment code, from cpu-
teardown code?
Right now, for what seemed to be necessary until now, we have the
arch_vcpu_block(). Do we need more? If yes where?
From looking only at schedule.c, we already have arch_move_irqs(), can
we take advantage of it?
Regards,
Dario
--
<<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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next prev parent reply other threads:[~2016-05-24 14:46 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-05-20 8:53 [PATCH 0/3] VMX: Properly handle pi descriptor and per-cpu blocking list Feng Wu
2016-05-20 8:53 ` [PATCH 1/3] VMX: Properly adjuest the status of pi descriptor Feng Wu
2016-05-23 5:15 ` Tian, Kevin
2016-05-23 5:27 ` Wu, Feng
2016-05-23 6:52 ` Tian, Kevin
2016-05-23 7:16 ` Wu, Feng
2016-05-23 9:03 ` Jan Beulich
2016-05-23 9:21 ` Wu, Feng
2016-05-23 11:04 ` Jan Beulich
2016-05-23 12:30 ` Jan Beulich
2016-05-20 8:53 ` [PATCH 2/3] VMX: Make hook pi_do_resume always available Feng Wu
2016-05-23 12:32 ` Jan Beulich
2016-05-23 12:51 ` Dario Faggioli
2016-05-20 8:53 ` [PATCH 3/3] VMX: Remove the vcpu from the per-cpu blocking list after domain termination Feng Wu
2016-05-23 5:19 ` Tian, Kevin
2016-05-23 5:48 ` Wu, Feng
2016-05-23 6:54 ` Tian, Kevin
2016-05-23 9:08 ` Jan Beulich
2016-05-23 9:17 ` Wu, Feng
2016-05-23 10:35 ` Wu, Feng
2016-05-23 11:11 ` Jan Beulich
2016-05-23 12:24 ` Wu, Feng
2016-05-23 12:46 ` Jan Beulich
2016-05-23 13:41 ` Wu, Feng
2016-05-23 12:30 ` Dario Faggioli
2016-05-23 13:32 ` Wu, Feng
2016-05-23 14:45 ` Dario Faggioli
2016-05-23 12:35 ` Jan Beulich
2016-05-23 13:33 ` Wu, Feng
2016-05-20 10:27 ` [PATCH 0/3] VMX: Properly handle pi descriptor and per-cpu blocking list Jan Beulich
2016-05-20 10:46 ` Wu, Feng
2016-05-23 8:08 ` Jan Beulich
2016-05-23 8:44 ` Wu, Feng
2016-05-23 8:51 ` Jan Beulich
2016-05-23 12:39 ` Dario Faggioli
2016-05-24 10:07 ` Wu, Feng
2016-05-24 13:33 ` Wu, Feng
2016-05-24 14:46 ` Dario Faggioli [this message]
2016-05-25 13:28 ` Wu, Feng
2016-05-24 14:02 ` Dario Faggioli
2016-05-25 12:39 ` Wu, Feng
2016-06-23 12:33 ` Wu, Feng
2016-06-23 15:11 ` Dario Faggioli
2016-06-24 6:11 ` Wu, Feng
2016-06-24 7:22 ` Dario Faggioli
2016-06-24 7:59 ` Wu, Feng
2016-06-24 10:27 ` Dario Faggioli
2016-06-24 13:25 ` Wu, Feng
2016-06-24 23:43 ` Dario Faggioli
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