On 24.02.2021 20:01, David Hildenbrand wrote:
On 24.02.21 17:56, Andrey Gruzdev wrote:
On 22.02.2021 21:11, David Hildenbrand wrote:
On 22.02.21 18:54, Peter Xu wrote:
On Mon, Feb 22, 2021 at 06:33:27PM +0100, David Hildenbrand wrote:
On 22.02.21 18:29, Peter Xu wrote:
On Sat, Feb 20, 2021
On 24.02.21 17:56, Andrey Gruzdev wrote:
On 22.02.2021 21:11, David Hildenbrand wrote:
On 22.02.21 18:54, Peter Xu wrote:
On Mon, Feb 22, 2021 at 06:33:27PM +0100, David Hildenbrand wrote:
On 22.02.21 18:29, Peter Xu wrote:
On Sat, Feb 20, 2021 at 02:59:42AM -0500, David Hildenbrand wrote:
On 19.02.2021 23:50, Peter Xu wrote:
Andrey,
On Fri, Feb 19, 2021 at 09:57:37AM +0300, Andrey Gruzdev wrote:
For the discards that happen before snapshot is started, I need to dig into
Linux and QEMU virtio-baloon
code more to get clear with it.
Yes it's very tricky on how the error could
On 24.02.2021 19:54, David Hildenbrand wrote:
Anyhow I'm quite sure that adding global MISSING handler for
snapshotting
is too heavy and not really needed.
UFFDIO_ZEROCOPY installs a zero pfn and that should be all of it.
There'll
definitely be overhead, but it may not be that huge as
On 22.02.2021 21:11, David Hildenbrand wrote:
On 22.02.21 18:54, Peter Xu wrote:
On Mon, Feb 22, 2021 at 06:33:27PM +0100, David Hildenbrand wrote:
On 22.02.21 18:29, Peter Xu wrote:
On Sat, Feb 20, 2021 at 02:59:42AM -0500, David Hildenbrand wrote:
Live snapshotting ends up reading all guest
Anyhow I'm quite sure that adding global MISSING handler for snapshotting
is too heavy and not really needed.
UFFDIO_ZEROCOPY installs a zero pfn and that should be all of it. There'll
definitely be overhead, but it may not be that huge as imagined. Live snapshot
is great in that we have
On 22.02.21 18:54, Peter Xu wrote:
On Mon, Feb 22, 2021 at 06:33:27PM +0100, David Hildenbrand wrote:
On 22.02.21 18:29, Peter Xu wrote:
On Sat, Feb 20, 2021 at 02:59:42AM -0500, David Hildenbrand wrote:
Live snapshotting ends up reading all guest memory (dirty bitmap starts with
all 1s),
On Mon, Feb 22, 2021 at 06:33:27PM +0100, David Hildenbrand wrote:
> On 22.02.21 18:29, Peter Xu wrote:
> > On Sat, Feb 20, 2021 at 02:59:42AM -0500, David Hildenbrand wrote:
> > > Live snapshotting ends up reading all guest memory (dirty bitmap starts
> > > with all 1s), which is not what we
On Sat, Feb 20, 2021 at 02:59:42AM -0500, David Hildenbrand wrote:
> Live snapshotting ends up reading all guest memory (dirty bitmap starts with
> all 1s), which is not what we want for virtio-mem - we don’t want to read and
> migrate memory that has been discarded and has no stable content.
>
On 22.02.21 18:29, Peter Xu wrote:
On Sat, Feb 20, 2021 at 02:59:42AM -0500, David Hildenbrand wrote:
Live snapshotting ends up reading all guest memory (dirty bitmap starts with
all 1s), which is not what we want for virtio-mem - we don’t want to read and
migrate memory that has been
> Am 19.02.2021 um 23:47 schrieb Peter Xu :
>
> On Fri, Feb 19, 2021 at 10:20:42PM +0100, David Hildenbrand wrote:
>>> A shiver just went down my spine. Please don‘t just for the sake of
>>> creating a snapshot.
>>>
>>> (Just imagine you don‘t have a shared zeropage...)
>>
>> ... and I just
On Fri, Feb 19, 2021 at 10:20:42PM +0100, David Hildenbrand wrote:
> > A shiver just went down my spine. Please don‘t just for the sake of
> > creating a snapshot.
> >
> > (Just imagine you don‘t have a shared zeropage...)
>
> ... and I just remembered we read all memory either way. Gah.
>
> I
> Am 19.02.2021 um 22:14 schrieb David Hildenbrand :
>
>
>>> Am 19.02.2021 um 22:10 schrieb Peter Xu :
>>>
>>> On Fri, Feb 19, 2021 at 03:50:52PM -0500, Peter Xu wrote:
>>> Andrey,
>>>
On Fri, Feb 19, 2021 at 09:57:37AM +0300, Andrey Gruzdev wrote:
For the discards that happen
> Am 19.02.2021 um 22:10 schrieb Peter Xu :
>
> On Fri, Feb 19, 2021 at 03:50:52PM -0500, Peter Xu wrote:
>> Andrey,
>>
>>> On Fri, Feb 19, 2021 at 09:57:37AM +0300, Andrey Gruzdev wrote:
>>> For the discards that happen before snapshot is started, I need to dig into
>>> Linux and QEMU
On Fri, Feb 19, 2021 at 03:50:52PM -0500, Peter Xu wrote:
> Andrey,
>
> On Fri, Feb 19, 2021 at 09:57:37AM +0300, Andrey Gruzdev wrote:
> > For the discards that happen before snapshot is started, I need to dig into
> > Linux and QEMU virtio-baloon
> > code more to get clear with it.
>
> Yes
Andrey,
On Fri, Feb 19, 2021 at 09:57:37AM +0300, Andrey Gruzdev wrote:
> For the discards that happen before snapshot is started, I need to dig into
> Linux and QEMU virtio-baloon
> code more to get clear with it.
Yes it's very tricky on how the error could trigger.
Let's think of below
On 19.02.21 07:57, Andrey Gruzdev wrote:
On 17.02.2021 02:35, Peter Xu wrote:
Hi, Andrey,
On Sat, Feb 13, 2021 at 12:34:07PM +0300, Andrey Gruzdev wrote:
On 12.02.2021 19:11, Peter Xu wrote:
On Fri, Feb 12, 2021 at 09:52:52AM +0100, David Hildenbrand wrote:
On 12.02.21 04:06, Peter Xu
On 17.02.2021 02:35, Peter Xu wrote:
Hi, Andrey,
On Sat, Feb 13, 2021 at 12:34:07PM +0300, Andrey Gruzdev wrote:
On 12.02.2021 19:11, Peter Xu wrote:
On Fri, Feb 12, 2021 at 09:52:52AM +0100, David Hildenbrand wrote:
On 12.02.21 04:06, Peter Xu wrote:
On Thu, Feb 11, 2021 at 10:09:58PM
On 17.02.21 00:35, Peter Xu wrote:
Hi, Andrey,
On Sat, Feb 13, 2021 at 12:34:07PM +0300, Andrey Gruzdev wrote:
On 12.02.2021 19:11, Peter Xu wrote:
On Fri, Feb 12, 2021 at 09:52:52AM +0100, David Hildenbrand wrote:
On 12.02.21 04:06, Peter Xu wrote:
On Thu, Feb 11, 2021 at 10:09:58PM +0100,
Hi, Andrey,
On Sat, Feb 13, 2021 at 12:34:07PM +0300, Andrey Gruzdev wrote:
> On 12.02.2021 19:11, Peter Xu wrote:
> > On Fri, Feb 12, 2021 at 09:52:52AM +0100, David Hildenbrand wrote:
> > > On 12.02.21 04:06, Peter Xu wrote:
> > > > On Thu, Feb 11, 2021 at 10:09:58PM +0100, David Hildenbrand
> Am 13.02.2021 um 10:34 schrieb Andrey Gruzdev :
>
>
>> On 12.02.2021 19:11, Peter Xu wrote:
On Fri, Feb 12, 2021 at 09:52:52AM +0100, David Hildenbrand wrote:
> On 12.02.21 04:06, Peter Xu wrote:
>> On Thu, Feb 11, 2021 at 10:09:58PM +0100, David Hildenbrand wrote:
>> The
On 12.02.2021 19:11, Peter Xu wrote:
On Fri, Feb 12, 2021 at 09:52:52AM +0100, David Hildenbrand wrote:
On 12.02.21 04:06, Peter Xu wrote:
On Thu, Feb 11, 2021 at 10:09:58PM +0100, David Hildenbrand wrote:
The issue is when the discard happened before starting the snapshot.
Write-protection
On Fri, Feb 12, 2021 at 09:52:52AM +0100, David Hildenbrand wrote:
> On 12.02.21 04:06, Peter Xu wrote:
> > On Thu, Feb 11, 2021 at 10:09:58PM +0100, David Hildenbrand wrote:
> > > The issue is when the discard happened before starting the snapshot.
> > > Write-protection won‘t work and the
On 12.02.21 04:06, Peter Xu wrote:
On Thu, Feb 11, 2021 at 10:09:58PM +0100, David Hildenbrand wrote:
The issue is when the discard happened before starting the snapshot.
Write-protection won‘t work and the zeroed content won‘t be retained in the
snapshot.
I see what you mean now, and iiuc
On Thu, Feb 11, 2021 at 10:09:58PM +0100, David Hildenbrand wrote:
> The issue is when the discard happened before starting the snapshot.
> Write-protection won‘t work and the zeroed content won‘t be retained in the
> snapshot.
I see what you mean now, and iiuc it will only be a problem if
> Am 11.02.2021 um 22:05 schrieb Peter Xu :
>
> On Thu, Feb 11, 2021 at 09:44:07PM +0100, David Hildenbrand wrote:
>> Let‘s take a look at init-on-free.
>>
>> The guest zeroes a page and puts it onto a buddy freelist. Free page
>> reporting code takes it off that list and reports it to the
On Thu, Feb 11, 2021 at 09:44:07PM +0100, David Hildenbrand wrote:
> Let‘s take a look at init-on-free.
>
> The guest zeroes a page and puts it onto a buddy freelist. Free page
> reporting code takes it off that list and reports it to the hypervisor. The
> hypervisor discards the physical page
> Am 11.02.2021 um 21:31 schrieb Peter Xu :
>
> On Thu, Feb 11, 2021 at 08:01:29PM +0100, David Hildenbrand wrote:
>>> On 11.02.21 19:28, Andrey Gruzdev wrote:
>>> On 11.02.2021 20:32, Peter Xu wrote:
On Thu, Feb 11, 2021 at 07:19:47PM +0300, Andrey Gruzdev wrote:
> On 09.02.2021
On Thu, Feb 11, 2021 at 08:01:29PM +0100, David Hildenbrand wrote:
> On 11.02.21 19:28, Andrey Gruzdev wrote:
> > On 11.02.2021 20:32, Peter Xu wrote:
> > > On Thu, Feb 11, 2021 at 07:19:47PM +0300, Andrey Gruzdev wrote:
> > > > On 09.02.2021 22:06, David Hildenbrand wrote:
> > > > > > > Hi,
> > >
On 09.02.21 19:38, Andrey Gruzdev wrote:
On 09.02.2021 15:37, David Hildenbrand wrote:
On 21.01.21 16:24, andrey.gruzdev--- via wrote:
This patch series is a kind of 'rethinking' of Denis Plotnikov's
ideas he's
implemented in his series '[PATCH v0 0/4] migration: add background
snapshot'.
On 11.02.21 19:28, Andrey Gruzdev wrote:
On 11.02.2021 20:32, Peter Xu wrote:
On Thu, Feb 11, 2021 at 07:19:47PM +0300, Andrey Gruzdev wrote:
On 09.02.2021 22:06, David Hildenbrand wrote:
Hi,
just stumbled over this, quick question:
I recently played with UFFD_WP and notices that write
On 11.02.2021 20:32, Peter Xu wrote:
On Thu, Feb 11, 2021 at 07:19:47PM +0300, Andrey Gruzdev wrote:
On 09.02.2021 22:06, David Hildenbrand wrote:
Hi,
just stumbled over this, quick question:
I recently played with UFFD_WP and notices that write protection is
only effective on pages/ranges
On 11.02.2021 20:18, Peter Xu wrote:
On Thu, Feb 11, 2021 at 12:21:51PM +0300, Andrey Gruzdev wrote:
On 09.02.2021 23:31, Peter Xu wrote:
On Tue, Feb 09, 2021 at 03:09:28PM -0500, Peter Xu wrote:
Hi, David, Andrey,
On Tue, Feb 09, 2021 at 08:06:58PM +0100, David Hildenbrand wrote:
Hi,
just
On Thu, Feb 11, 2021 at 07:19:47PM +0300, Andrey Gruzdev wrote:
> On 09.02.2021 22:06, David Hildenbrand wrote:
> > > > Hi,
> > > >
> > > > just stumbled over this, quick question:
> > > >
> > > > I recently played with UFFD_WP and notices that write protection is
> > > > only effective on
On Thu, Feb 11, 2021 at 12:21:51PM +0300, Andrey Gruzdev wrote:
> On 09.02.2021 23:31, Peter Xu wrote:
> > On Tue, Feb 09, 2021 at 03:09:28PM -0500, Peter Xu wrote:
> > > Hi, David, Andrey,
> > >
> > > On Tue, Feb 09, 2021 at 08:06:58PM +0100, David Hildenbrand wrote:
> > > > > > Hi,
> > > > > >
On 09.02.2021 22:06, David Hildenbrand wrote:
Hi,
just stumbled over this, quick question:
I recently played with UFFD_WP and notices that write protection is
only effective on pages/ranges that have already pages populated (IOW:
!pte_none() in the kernel).
In case memory was never populated
On 09.02.2021 23:31, Peter Xu wrote:
On Tue, Feb 09, 2021 at 03:09:28PM -0500, Peter Xu wrote:
Hi, David, Andrey,
On Tue, Feb 09, 2021 at 08:06:58PM +0100, David Hildenbrand wrote:
Hi,
just stumbled over this, quick question:
I recently played with UFFD_WP and notices that write protection
On Tue, Feb 09, 2021 at 03:09:28PM -0500, Peter Xu wrote:
> Hi, David, Andrey,
>
> On Tue, Feb 09, 2021 at 08:06:58PM +0100, David Hildenbrand wrote:
> > > > Hi,
> > > >
> > > > just stumbled over this, quick question:
> > > >
> > > > I recently played with UFFD_WP and notices that write
Hi, David, Andrey,
On Tue, Feb 09, 2021 at 08:06:58PM +0100, David Hildenbrand wrote:
> > > Hi,
> > >
> > > just stumbled over this, quick question:
> > >
> > > I recently played with UFFD_WP and notices that write protection is
> > > only effective on pages/ranges that have already pages
Hi,
just stumbled over this, quick question:
I recently played with UFFD_WP and notices that write protection is
only effective on pages/ranges that have already pages populated (IOW:
!pte_none() in the kernel).
In case memory was never populated (or was discarded using e.g.,
On 09.02.2021 15:37, David Hildenbrand wrote:
On 21.01.21 16:24, andrey.gruzdev--- via wrote:
This patch series is a kind of 'rethinking' of Denis Plotnikov's
ideas he's
implemented in his series '[PATCH v0 0/4] migration: add background
snapshot'.
Currently the only way to make (external)
On 21.01.21 16:24, andrey.gruzdev--- via wrote:
This patch series is a kind of 'rethinking' of Denis Plotnikov's ideas he's
implemented in his series '[PATCH v0 0/4] migration: add background snapshot'.
Currently the only way to make (external) live VM snapshot is using existing
dirty page
This patch series is a kind of 'rethinking' of Denis Plotnikov's ideas he's
implemented in his series '[PATCH v0 0/4] migration: add background snapshot'.
Currently the only way to make (external) live VM snapshot is using existing
dirty page logging migration mechanism. The main problem is that
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