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From: zhanghailiang <zhang.zhanghailiang@huawei.com>
To: Alexandre DERUMIER <aderumier@odiso.com>
Cc: qemu-devel <qemu-devel@nongnu.org>
Subject: Re: [Qemu-devel] ballooning not working on hotplugged  pc-dimm
Date: Wed, 10 Sep 2014 17:00:24 +0800	[thread overview]
Message-ID: <54101328.4070802@huawei.com> (raw)
In-Reply-To: <e8665241-6327-45ee-8762-f423cdcb7169@mailpro>

On 2014/9/9 11:05, Alexandre DERUMIER wrote:
> Hello,
>
> I was playing with pc-dimm hotplug, and I notice that balloning is not working on
> memory space of pc-dimm devices.
>
> example:
>
> qemu -m size=1024,slots=255,maxmem=15000M
>
> #free -m : 1024M
> ->  qmp balloon 512M
> #free -m : 512M
>
> ->  hotplug pc-dimm 1G:
>
> #free -m : 1512M
>
>
> (This is the same behavior if qemu is started with pc-dimm devices)
>
>
> qemu 2.1
> Guest kernel : 3.12.
>
>
>
> Does it need a guest balloon module update ?
>
> Regards,
>
> Alexandre Derumier
>
>
>
Hi,

I noticed this fault also;-), this is a bug in qemu, And some work in process...

Actually in QEMU the hotplugged memory(named hotplug-memory) is distinguished
from the common memory(named pc.ram). When do balloon action, QEMU wrongly
stats the ram_size.

I will send a patch series which also include other bug fix for the memory hotplug.

Thanks,
zhanghailiang

  reply	other threads:[~2014-09-10  9:00 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <0a98da72-f316-4e2b-8327-201f85a6e879@mailpro>
2014-09-09  3:05 ` [Qemu-devel] ballooning not working on hotplugged pc-dimm Alexandre DERUMIER
2014-09-10  9:00   ` zhanghailiang [this message]
2014-09-11  1:57     ` Michael R. Hines
2014-09-11  6:22       ` Paolo Bonzini
2014-09-11  6:27         ` Michael R. Hines
2014-09-11  6:33           ` zhanghailiang

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