From: "Tian, Kevin" <kevin.tian@intel.com>
To: Konrad Rzeszutek Wilk <konrad@darnok.org>
Cc: "jeremy@goop.org" <jeremy@goop.org>,
"xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>,
"Ian.Campbell@citrix.com" <Ian.Campbell@citrix.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
"mike.mcclurg@citrix.com" <mike.mcclurg@citrix.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"stefan.bader@canonical.com" <stefan.bader@canonical.com>,
"rjw@sisk.pl" <rjw@sisk.pl>,
"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
"liang.tang@oracle.com" <liang.tang@oracle.com>,
"Yu, Ke" <ke.yu@intel.com>,
"konrad@kernel.org" <konrad@kernel.org>,
"lenb@kernel.org" <lenb@kernel.org>
Subject: RE: [Xen-devel] [PATCH 3/8] ACPI: processor: add __acpi_processor_[un]register_driver helpers.
Date: Mon, 26 Dec 2011 01:31:45 +0000 [thread overview]
Message-ID: <AADFC41AFE54684AB9EE6CBC0274A5D10145B9@SHSMSX102.ccr.corp.intel.com> (raw)
In-Reply-To: <20111223030103.GA7218@andromeda.dapyr.net>
> From: Konrad Rzeszutek Wilk [mailto:konrad@darnok.org]
> Sent: Friday, December 23, 2011 11:01 AM
>
> > > OK. Lets put the # VCPU != PCPU aside. Say dom0 will boot with all
> > > CPUs and then later on the admin starts unplugging them.
> >
> > This should be communicated to major Xen based distributions, so that it's
> > an agreed approach since in majority case dom0 is configured as UP or
> > a few VCPUs.
>
> I am not saying that is it the agreed approach. There has to be
> flexibility in supporting both. But what I want to understand whether
> the requirement for VCPU != PCPU can be put aside and put in the drivers
> later on.
sure. VCPU!=PCPU requirement is orthogonal to the basic part for gearing
ACPI information to Xen.
>
> So that the first approach is not changing the generic drivers (much).
> The reason I am asking about this is two-fold:
> 1). For new distros (Ubuntu, Fedora), the default is all VCPUs.
good to know that.
> Enterprising users might use dom0_max_vcpus to limit the VCPU count,
> but most won't.
> Which mean we can concentrate on bringing the _Pxx/_Cxx parsing
> up to the hypervisor. Which is really neccessary on any chipset
> which has the notion of TurboBoost (otherwise the Xen scheduler
> won't pick this up and won't engage this mode in certain
> workloads).
> 2). The ACPI maintainers are busy with ACPI 5.0. I don't know how
> much work this is, but it probably means tons of stuff with
> embedded platforms and tons of regression testing. So if there
> is a patch that does not impact the generic code much (or any)
> it will make their life easier. Which also means we can built
> on top that for the VCPU != PCPU case.
>
> That is what I am trying to understand.
no problem. this incremental approach should work.
Thanks
Kevin
next prev parent reply other threads:[~2011-12-26 1:32 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-11-30 17:20 [RFC PATCH] Exporting ACPI Pxx/Cxx states to other kernel subsystems (v1) Konrad Rzeszutek Wilk
2011-11-30 17:20 ` [PATCH 1/8] ACPI: processor: export necessary interfaces Konrad Rzeszutek Wilk
2011-12-16 21:33 ` Konrad Rzeszutek Wilk
2011-12-19 5:43 ` Tian, Kevin
2011-12-19 14:17 ` [Xen-devel] " Konrad Rzeszutek Wilk
2011-11-30 17:20 ` [PATCH 2/8] ACPI: processor: cache acpi_power_register in cx structure Konrad Rzeszutek Wilk
2011-11-30 17:20 ` [PATCH 3/8] ACPI: processor: add __acpi_processor_[un]register_driver helpers Konrad Rzeszutek Wilk
2011-12-16 22:03 ` Konrad Rzeszutek Wilk
2011-12-19 5:48 ` Tian, Kevin
2011-12-19 14:26 ` [Xen-devel] " Konrad Rzeszutek Wilk
2011-12-20 2:29 ` Tian, Kevin
2011-12-20 15:31 ` Konrad Rzeszutek Wilk
2011-12-21 0:35 ` Tian, Kevin
2011-12-23 3:01 ` Konrad Rzeszutek Wilk
2011-12-26 1:31 ` Tian, Kevin [this message]
2012-01-03 20:59 ` Konrad Rzeszutek Wilk
2012-01-06 1:07 ` Tian, Kevin
2012-01-13 22:24 ` Konrad Rzeszutek Wilk
2012-01-17 3:03 ` Tian, Kevin
2012-01-17 17:13 ` Konrad Rzeszutek Wilk
2012-01-17 18:19 ` Konrad Rzeszutek Wilk
2012-01-23 16:53 ` Konrad Rzeszutek Wilk
2011-11-30 17:21 ` [PATCH 4/8] ACPI: processor: Don't setup cpu idle driver and handler when we do not want them Konrad Rzeszutek Wilk
2011-12-16 21:36 ` Konrad Rzeszutek Wilk
2011-11-30 17:21 ` [PATCH 5/8] ACPI: add processor driver for Xen virtual CPUs Konrad Rzeszutek Wilk
2011-12-01 9:24 ` [Xen-devel] " Jan Beulich
2011-12-12 17:29 ` Konrad Rzeszutek Wilk
2011-12-13 7:45 ` Jan Beulich
2011-12-13 9:26 ` liang tang
2011-12-16 22:21 ` Konrad Rzeszutek Wilk
2012-02-10 17:18 ` Konrad Rzeszutek Wilk
2011-11-30 17:21 ` [PATCH 6/8] ACPI: processor: override the interface of register acpi processor handler for Xen vcpu Konrad Rzeszutek Wilk
2011-11-30 17:21 ` [PATCH 7/8] ACPI: xen processor: add PM notification interfaces Konrad Rzeszutek Wilk
2011-11-30 17:21 ` [PATCH 8/8] ACPI: xen processor: set ignore_ppc to handle PPC event for Xen vcpu Konrad Rzeszutek Wilk
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