From: Luiz Capitulino <lcapitulino@redhat.com>
To: Rusty Russell <rusty@rustcorp.com.au>
Cc: linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
riel@redhat.com, aarcange@redhat.com, aquini@redhat.com,
mst@redhat.com, vdavydov@parallels.com, amit.shah@redhat.com,
dfediuck@redhat.com, alitke@redhat.com
Subject: Re: [RFC PATCH 3/4] virtio_balloon: add pressure notification via a new virtqueue
Date: Thu, 16 Jan 2014 20:43:51 -0500 [thread overview]
Message-ID: <20140116204351.7d48c2b9@redhat.com> (raw)
In-Reply-To: <20140116203819.0e7be6d4@redhat.com>
On Thu, 16 Jan 2014 20:38:19 -0500
Luiz Capitulino <lcapitulino@redhat.com> wrote:
> > What does qemu do with this information?
>
> There are two possible scenarios:
>
> 1. The balloon driver is currently inflating when it gets under
> pressure
>
> QEMU resets "num_pages" to the current balloon size. This
> cancels the on-going inflate
>
> 2. The balloon driver is not inflating, eg. it's possibly sleeping
>
> QEMU issues a deflate
>
> But note that those scenarios are not supposed to be used with the
> current device, they are part of the automatic ballooning feature.
> I CC'ed you on the QEMU patch, you can find it here case you didn't
> see it:
>
> http://marc.info/?l=kvm&m=138988966315690&w=2
By "current device" I meant "outside of automatic ballooning scope".
next prev parent reply other threads:[~2014-01-17 1:43 UTC|newest]
Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-01-16 16:24 [RFC PATCH 0/4] virtio_balloon: add pressure notification via a new virtqueue Luiz Capitulino
2014-01-16 16:24 ` [RFC PATCH 1/4] vmpressure: in-kernel notifications Luiz Capitulino
2014-01-16 16:24 ` [RFC PATCH 2/4] vmpressure in-kernel: hack Luiz Capitulino
2014-01-16 16:24 ` [RFC PATCH 3/4] virtio_balloon: add pressure notification via a new virtqueue Luiz Capitulino
2014-01-16 22:40 ` Rusty Russell
2014-01-17 1:38 ` Luiz Capitulino
2014-01-17 1:43 ` Luiz Capitulino [this message]
2014-01-20 2:13 ` Rusty Russell
2014-01-20 14:59 ` Luiz Capitulino
2014-01-16 16:24 ` [RFC PATCH 4/4] virtio_balloon: skip inflation if guest is under pressure Luiz Capitulino
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