On Thu, Mar 10, 2016 at 01:41:16AM +, Li, Liang Z wrote:
> > > > > > Yes, we really can teach qemu to skip these pages and it's not hard.
> > > > > > The problem is the poor performance, this PV solution
> > > > >
> > > > > Balloon is always PV. And do not call patches solutions please.
> > > >
On Wed, Mar 09, 2016 at 07:39:18PM +0200, Michael S. Tsirkin wrote:
> On Wed, Mar 09, 2016 at 08:04:39PM +0300, Roman Kagan wrote:
> > On Wed, Mar 09, 2016 at 05:41:39PM +0200, Michael S. Tsirkin wrote:
> > > On Wed, Mar 09, 2016 at 05:28:54PM +0300, Roman Kagan wrote:
> > > > For (1) I've been try
On Wed, Mar 09, 2016 at 02:38:52PM -0500, Rik van Riel wrote:
> On Wed, 2016-03-09 at 20:04 +0300, Roman Kagan wrote:
> > On Wed, Mar 09, 2016 at 05:41:39PM +0200, Michael S. Tsirkin wrote:
> > > On Wed, Mar 09, 2016 at 05:28:54PM +0300, Roman Kagan wrote:
> > > > For (1) I've been trying to make a
> > > > > Yes, we really can teach qemu to skip these pages and it's not hard.
> > > > > The problem is the poor performance, this PV solution
> > > >
> > > > Balloon is always PV. And do not call patches solutions please.
> > > >
> > > > > is aimed to make it more
> > > > > efficient and reduce th
On Wed, 2016-03-09 at 20:04 +0300, Roman Kagan wrote:
> On Wed, Mar 09, 2016 at 05:41:39PM +0200, Michael S. Tsirkin wrote:
> > On Wed, Mar 09, 2016 at 05:28:54PM +0300, Roman Kagan wrote:
> > > For (1) I've been trying to make a point that skipping clean
> > > pages is
> > > much more likely to re
On Wed, Mar 09, 2016 at 08:04:39PM +0300, Roman Kagan wrote:
> On Wed, Mar 09, 2016 at 05:41:39PM +0200, Michael S. Tsirkin wrote:
> > On Wed, Mar 09, 2016 at 05:28:54PM +0300, Roman Kagan wrote:
> > > For (1) I've been trying to make a point that skipping clean pages is
> > > much more likely to r
On Wed, Mar 09, 2016 at 05:41:39PM +0200, Michael S. Tsirkin wrote:
> On Wed, Mar 09, 2016 at 05:28:54PM +0300, Roman Kagan wrote:
> > For (1) I've been trying to make a point that skipping clean pages is
> > much more likely to result in noticable benefit than free pages only.
>
> I guess when yo
On Wed, Mar 09, 2016 at 05:28:54PM +0300, Roman Kagan wrote:
> On Mon, Mar 07, 2016 at 01:40:06PM +0200, Michael S. Tsirkin wrote:
> > On Mon, Mar 07, 2016 at 06:49:19AM +, Li, Liang Z wrote:
> > > > > No. And it's exactly what I mean. The ballooned memory is still
> > > > > processed during li
On Wed, Mar 09, 2016 at 03:27:54PM +, Li, Liang Z wrote:
> > On Mon, Mar 07, 2016 at 01:40:06PM +0200, Michael S. Tsirkin wrote:
> > > On Mon, Mar 07, 2016 at 06:49:19AM +, Li, Liang Z wrote:
> > > > > > No. And it's exactly what I mean. The ballooned memory is still
> > > > > > processed d
> On Mon, Mar 07, 2016 at 01:40:06PM +0200, Michael S. Tsirkin wrote:
> > On Mon, Mar 07, 2016 at 06:49:19AM +, Li, Liang Z wrote:
> > > > > No. And it's exactly what I mean. The ballooned memory is still
> > > > > processed during live migration without skipping. The live
> > > > > migration c
On Mon, Mar 07, 2016 at 01:40:06PM +0200, Michael S. Tsirkin wrote:
> On Mon, Mar 07, 2016 at 06:49:19AM +, Li, Liang Z wrote:
> > > > No. And it's exactly what I mean. The ballooned memory is still
> > > > processed during live migration without skipping. The live migration
> > > > code is
>
> On Fri, Mar 04, 2016 at 06:51:21PM +, Dr. David Alan Gilbert wrote:
> > * Paolo Bonzini (pbonz...@redhat.com) wrote:
> > >
> > >
> > > On 04/03/2016 15:26, Li, Liang Z wrote:
> > > >> >
> > > >> > The memory usage will keep increasing due to ever growing
> > > >> > caches, etc, so you'll be l
On Fri, Mar 04, 2016 at 06:51:21PM +, Dr. David Alan Gilbert wrote:
> * Paolo Bonzini (pbonz...@redhat.com) wrote:
> >
> >
> > On 04/03/2016 15:26, Li, Liang Z wrote:
> > >> >
> > >> > The memory usage will keep increasing due to ever growing caches, etc,
> > >> > so
> > >> > you'll be left
> On 04/03/2016 15:26, Li, Liang Z wrote:
> >> >
> >> > The memory usage will keep increasing due to ever growing caches,
> >> > etc, so you'll be left with very little free memory fairly soon.
> >> >
> > I don't think so.
> >
>
> Roman is right. For example, here I am looking at a 64 GB (physica
> On Fri, Mar 04, 2016 at 03:13:03PM +, Li, Liang Z wrote:
> > > > Maybe I am not clear enough.
> > > >
> > > > I mean if we inflate balloon before live migration, for a 8GB
> > > > guest, it takes
> > > about 5 Seconds for the inflating operation to finish.
> > >
> > > And these 5 seconds are
On Fri, Mar 04, 2016 at 03:13:03PM +, Li, Liang Z wrote:
> > > Maybe I am not clear enough.
> > >
> > > I mean if we inflate balloon before live migration, for a 8GB guest, it
> > > takes
> > about 5 Seconds for the inflating operation to finish.
> >
> > And these 5 seconds are spent where?
>
...@lists.linux-foundation.org; r...@twiddle.net; r...@redhat.com
> Subject: Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration
> optimization
>
> On Mon, Mar 07, 2016 at 06:49:19AM +, Li, Liang Z wrote:
> > > > No. And it's exactly what I mean. The ballooned m
On Mon, Mar 07, 2016 at 06:49:19AM +, Li, Liang Z wrote:
> > > No. And it's exactly what I mean. The ballooned memory is still
> > > processed during live migration without skipping. The live migration code
> > > is
> > in migration/ram.c.
> >
> > So if guest acknowledged VIRTIO_BALLOON_F_MUS
> > No. And it's exactly what I mean. The ballooned memory is still
> > processed during live migration without skipping. The live migration code is
> in migration/ram.c.
>
> So if guest acknowledged VIRTIO_BALLOON_F_MUST_TELL_HOST, we can
> teach qemu to skip these pages.
> Want to write a patch
> > On 04/03/2016 15:26, Li, Liang Z wrote:
> > >> >
> > >> > The memory usage will keep increasing due to ever growing caches,
> > >> > etc, so you'll be left with very little free memory fairly soon.
> > >> >
> > > I don't think so.
> > >
> >
> > Roman is right. For example, here I am looking at
On Fri, Mar 04, 2016 at 03:49:37PM +, Li, Liang Z wrote:
> > > > > > > Only detect the unmapped/zero mapped pages is not enough.
> > > > Consider
> > > > > > the
> > > > > > > situation like case 2, it can't achieve the same result.
> > > > > >
> > > > > > Your case 2 doesn't exist in the real
* Paolo Bonzini (pbonz...@redhat.com) wrote:
>
>
> On 04/03/2016 15:26, Li, Liang Z wrote:
> >> >
> >> > The memory usage will keep increasing due to ever growing caches, etc, so
> >> > you'll be left with very little free memory fairly soon.
> >> >
> > I don't think so.
> >
>
> Roman is righ
On 04/03/2016 15:26, Li, Liang Z wrote:
>> >
>> > The memory usage will keep increasing due to ever growing caches, etc, so
>> > you'll be left with very little free memory fairly soon.
>> >
> I don't think so.
>
Roman is right. For example, here I am looking at a 64 GB (physical)
machine wh
> > > > > > Only detect the unmapped/zero mapped pages is not enough.
> > > Consider
> > > > > the
> > > > > > situation like case 2, it can't achieve the same result.
> > > > >
> > > > > Your case 2 doesn't exist in the real world. If people could
> > > > > stop their main memory consumer in the
> > Maybe I am not clear enough.
> >
> > I mean if we inflate balloon before live migration, for a 8GB guest, it
> > takes
> about 5 Seconds for the inflating operation to finish.
>
> And these 5 seconds are spent where?
>
The time is spent on allocating the pages and send the allocated pages p
On Fri, Mar 04, 2016 at 02:26:49PM +, Li, Liang Z wrote:
> > Subject: Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration
> > optimization
> >
> > On Fri, Mar 04, 2016 at 09:08:44AM +, Li, Liang Z wrote:
> > > > On Fri, Mar 04, 2016 at
> Subject: Re: [Qemu-devel] [RFC qemu 0/4] A PV solution for live migration
> optimization
>
> On Fri, Mar 04, 2016 at 09:08:44AM +, Li, Liang Z wrote:
> > > On Fri, Mar 04, 2016 at 01:52:53AM +, Li, Liang Z wrote:
> > > > > I wonder if it would be
On Fri, Mar 04, 2016 at 10:11:00AM +, Li, Liang Z wrote:
> > On Fri, Mar 04, 2016 at 09:12:12AM +, Li, Liang Z wrote:
> > > > Although I wonder which is cheaper; that would be fairly expensive
> > > > for the guest wouldn't it? And you'd somehow have to kick the guest
> > > > before migrati
On Fri, Mar 04, 2016 at 09:08:44AM +, Li, Liang Z wrote:
> > On Fri, Mar 04, 2016 at 01:52:53AM +, Li, Liang Z wrote:
> > > > I wonder if it would be possible to avoid the kernel changes by
> > > > parsing /proc/self/pagemap - if that can be used to detect
> > > > unmapped/zero mapped pag
> On Fri, Mar 04, 2016 at 09:12:12AM +, Li, Liang Z wrote:
> > > Although I wonder which is cheaper; that would be fairly expensive
> > > for the guest wouldn't it? And you'd somehow have to kick the guest
> > > before migration to do the ballooning - and how long would you wait for
> it to fin
On Fri, Mar 04, 2016 at 09:12:12AM +, Li, Liang Z wrote:
> > Although I wonder which is cheaper; that would be fairly expensive for the
> > guest wouldn't it? And you'd somehow have to kick the guest before
> > migration to do the ballooning - and how long would you wait for it to
> > finish?
On Fri, Mar 04, 2016 at 09:08:20AM +, Dr. David Alan Gilbert wrote:
> * Roman Kagan (rka...@virtuozzo.com) wrote:
> > On Fri, Mar 04, 2016 at 08:23:09AM +, Li, Liang Z wrote:
> > > The unmapped/zero mapped pages can be detected by parsing
> > > /proc/self/pagemap,
> > > but the free pages
> * Roman Kagan (rka...@virtuozzo.com) wrote:
> > On Fri, Mar 04, 2016 at 08:23:09AM +, Li, Liang Z wrote:
> > > > On Thu, Mar 03, 2016 at 05:46:15PM +, Dr. David Alan Gilbert wrote:
> > > > > * Liang Li (liang.z...@intel.com) wrote:
> > > > > > The current QEMU live migration implementatio
* Roman Kagan (rka...@virtuozzo.com) wrote:
> On Fri, Mar 04, 2016 at 08:23:09AM +, Li, Liang Z wrote:
> > > On Thu, Mar 03, 2016 at 05:46:15PM +, Dr. David Alan Gilbert wrote:
> > > > * Liang Li (liang.z...@intel.com) wrote:
> > > > > The current QEMU live migration implementation mark the
> On Fri, Mar 04, 2016 at 01:52:53AM +, Li, Liang Z wrote:
> > > I wonder if it would be possible to avoid the kernel changes by
> > > parsing /proc/self/pagemap - if that can be used to detect
> > > unmapped/zero mapped pages in the guest ram, would it achieve the
> same result?
> >
> > Only
On Fri, Mar 04, 2016 at 08:23:09AM +, Li, Liang Z wrote:
> > On Thu, Mar 03, 2016 at 05:46:15PM +, Dr. David Alan Gilbert wrote:
> > > * Liang Li (liang.z...@intel.com) wrote:
> > > > The current QEMU live migration implementation mark the all the
> > > > guest's RAM pages as dirtied in the
> On Thu, Mar 03, 2016 at 05:46:15PM +, Dr. David Alan Gilbert wrote:
> > * Liang Li (liang.z...@intel.com) wrote:
> > > The current QEMU live migration implementation mark the all the
> > > guest's RAM pages as dirtied in the ram bulk stage, all these pages
> > > will be processed and that tak
On Fri, Mar 04, 2016 at 01:52:53AM +, Li, Liang Z wrote:
> > I wonder if it would be possible to avoid the kernel changes by parsing
> > /proc/self/pagemap - if that can be used to detect unmapped/zero mapped
> > pages in the guest ram, would it achieve the same result?
>
> Only detect the u
On Thu, Mar 03, 2016 at 05:46:15PM +, Dr. David Alan Gilbert wrote:
> * Liang Li (liang.z...@intel.com) wrote:
> > The current QEMU live migration implementation mark the all the
> > guest's RAM pages as dirtied in the ram bulk stage, all these pages
> > will be processed and that takes quit a
> On Thu, Mar 03, 2016 at 06:44:24PM +0800, Liang Li wrote:
> > The current QEMU live migration implementation mark the all the
> > guest's RAM pages as dirtied in the ram bulk stage, all these pages
> > will be processed and that takes quit a lot of CPU cycles.
> >
> > From guest's point of view,
On Thu, Mar 03, 2016 at 06:44:24PM +0800, Liang Li wrote:
> The current QEMU live migration implementation mark the all the
> guest's RAM pages as dirtied in the ram bulk stage, all these pages
> will be processed and that takes quit a lot of CPU cycles.
>
> From guest's point of view, it doesn't
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