Hi Jerry,

On Tue, Sep 11, 2012 at 08:27:40AM +0800, Jerry wrote:

Hi Wen,

I have been arranged a job related memory hotplug on ARM architecture.
Maybe I know some new issues about memory hotplug on ARM architecture. I
just enabled it on ARM, and it works well in my Android tablet now.
However, I have not send out my patches. The real reason is that I don't
know how to do it. Maybe I need to read "Documentation/SubmittingPatches".

Hi Andrew,
This is my first time to send you a e-mail. I am so nervous about if I have
some mistakes or not.

Don't be afraid.
If you might make a mistake, it's very natural to newbie.
I am sure anyone doesn't blame you. :)
If you have a good patch, please send out.

Some peoples maybe think memory hotplug need to be supported by special
hardware. Maybe it means memory physical hotplug. Some times, we just need
to use memory logical hotplug, doesn't remove the memory in physical. It is
also usefully for power saving in my platform. Because I doesn't want
the offline memory is in *self-refresh* state.

Just out of curiosity.
What's the your scenario and gain?
AFAIK, there were some effort about it in embedded side but gain isn't rather big
IIRC.

Any comments are appreciated.

Thanks,
Jerry

2012/9/10 Vasilis Liaskovitis [off-list ref]

quoted

Hi,

On Mon, Sep 10, 2012 at 10:01:44AM +0800, Wen Congyang wrote:

quoted

At 09/10/2012 09:46 AM, Yasuaki Ishimatsu Wrote:

quoted

Hi Wen,

2012/09/01 5:49, Andrew Morton wrote:

quoted

On Tue, 28 Aug 2012 18:00:07 +0800
wency@cn.fujitsu.com wrote:

quoted

This patch series aims to support physical memory hot-remove.

I doubt if many people have hardware which permits physical memory
removal?  How would you suggest that people with regular hardware can
test these chagnes?

How do you test the patch? As Andrew says, for hot-removing memory,
we need a particular hardware. I think so too. So many people may want
to know how to test the patch.
If we apply following patch to kvm guest, can we hot-remove memory on
kvm guest?

http://lists.gnu.org/archive/html/qemu-devel/2012-07/msg01389.html

Yes, if we apply this patchset, we can test hot-remove memory on kvm

guest.

quoted

But that patchset doesn't implement _PS3, so there is some restriction.

the following repos contain the patchset above, plus 2 more patches that
add
PS3 support to the dimm devices in qemu/seabios:

https://github.com/vliaskov/seabios/commits/memhp-v2
https://github.com/vliaskov/qemu-kvm/commits/memhp-v2

I have not posted the PS3 patches yet in the qemu list, but will post them
soon for v3 of the memory hotplug series. If you have issues testing, let
me
know.

thanks,

- Vasilis

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