linux-kernel - Re: [PATCH RFC v2 0/3] add cpu physically hotplug driver

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Message-ID: <1370824567.21655.10.camel@liguang.fnst.cn.fujitsu.com>
Date:	Mon, 10 Jun 2013 08:36:07 +0800
From:	li guang <lig.fnst@...fujitsu.com>
To:	"Rafael J. Wysocki" <rjw@...k.pl>
Cc:	Len Brown <lenb@...nel.org>,
	Matthew Garrett <matthew.garrett@...ula.com>,
	linux-kernel@...r.kernel.org, linux-acpi@...r.kernel.org,
	platform-driver-x86@...r.kernel.org,
	Andreas Färber <afaerber@...e.de>,
	Igor Mammedov <imammedo@...hat.com>
Subject: Re: [PATCH RFC v2 0/3] add cpu physically hotplug driver

Hi, Rafael

在 2013-06-06四的 13:00 +0200，Rafael J. Wysocki写道：
> On Thursday, June 06, 2013 09:40:32 AM liguang wrote:
> > This patch-set try to support physically hot-plug/unplug
> > a cpu automatically, that is:
> > if you offline a cpu, it will automatically actually remove
> > a cpu, and if you hot-plug a cpu, then it will online this
> > cpu automatically.
> 
> No and no.

Hmm... are you saying cpu online/offline designed to distinguish 
with real cpu plug/unplug?
but, what the actual usage of online/offline?
forgive my foolish.

> 
> Why do you need this?
> 

e.g. for QEMU case, if hot-plug a cpu,
we have to online a cpu manually if there's 
no user space support like udev to do it automatically.
and also, I think maybe online/offline should be naturally
integrated with real plug/unplug process of CPU.

> 
> 
> > so, offline is just like eject, but eject attribute seems not
> > available since recent kernel(can't figure out when), with
> > this driver, if allowed, it will trigger a eject cpu process.
> > and for automatically online, it was said there are objections,
> > don't know the reason, so, send this patch-set boldly.
> > 
> > of course, this approach is for QEMU 's hotplug cpu emulation 
> > only, but not limited, if someone like to explore ec space to
> > implment cpu hot-plug/unplug for real platform please
> > feel free to continue.
> > 
> > Li Guang (3)
> > 	 drivers/platform/x86: add cpu physically hotplug driver
> > 	 ec: add ec space notifier
> > 	 cpu_physic_hotplug: register handler for ec space notifier
> > 
> > drivers/acpi/ec.c                         | 32 ++++++++++++++++++++++++++++++++
> > drivers/platform/x86/Kconfig              |  8 ++++
> > drivers/platform/x86/Makefile             |  1 +
> > drivers/platform/x86/cpu_physic_hotplug.c | 90 +++++++++++++++++++++++++++++
> > include/linux/acpi.h                      |  2 ++
> > 5 files changed, 130 insertions(+), 3 deletions(-)
> >  create mode 100644 drivers/platform/x86/cpu_physic_hotplug.c


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