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

[Yasuaki Ishimatsu]

2013/06/10 9:36, li guang wrote:
> Hi, Rafael
>
> å 2013-06-06åç 13:00 +0200ïRafael J. Wysockiåéï
> > 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.

I could not understand why you do not use udev.
Please explain in detail.

> and also, I think maybe online/offline should be naturally
> integrated with real plug/unplug process of CPU.

I could not understand this explanation too.
Why do we need it?

Thanks,
Yasuaki Ishimatsu

> > > 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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