Am 01.02.2013 18:03, schrieb Paolo Bonzini:
> Il 31/01/2013 09:33, Orit Wasserman ha scritto:
If my above assumption that the guest reads unmapped memory as zeroes is
right, this mapping
is not necessary in the case of a zero dup page.
We just have to make sure that we are
Il 31/01/2013 09:33, Orit Wasserman ha scritto:
>> > If my above assumption that the guest reads unmapped memory as zeroes is
>> > right, this mapping
>> > is not necessary in the case of a zero dup page.
>> >
>> > We just have to make sure that we are still in the very first round when
>> > dec
Il 31/01/2013 10:48, Gleb Natapov ha scritto:
>> Also I notice that the bottle neck in migrating unmapped pages is the
>> detection of those pages
>> because we map the pages in order to check them, for a large guest this is
>> very expensive as mapping a page
>> results in a page fault in the ho
On Jan 31, 2013 11:14 PM, "Michael S. Tsirkin" wrote:
>
> On Thu, Jan 31, 2013 at 05:20:02PM +0200, Avi Kivity wrote:
> > On Thu, Jan 31, 2013 at 4:42 PM, Gleb Natapov wrote:
> > > On Thu, Jan 31, 2013 at 04:36:25PM +0200, Avi Kivity wrote:
> > >> On Thu, Jan 31, 2013 at 4:30 PM, Gleb Natapov
wr
On Thu, Jan 31, 2013 at 05:20:02PM +0200, Avi Kivity wrote:
> On Thu, Jan 31, 2013 at 4:42 PM, Gleb Natapov wrote:
> > On Thu, Jan 31, 2013 at 04:36:25PM +0200, Avi Kivity wrote:
> >> On Thu, Jan 31, 2013 at 4:30 PM, Gleb Natapov wrote:
> >> >> >
> >> >> > Avi/Michael do you remember why mincore
On Jan 31, 2013 12:29 PM, "Orit Wasserman" wrote:
>
> On 01/31/2013 11:48 AM, Gleb Natapov wrote:
> > On Thu, Jan 31, 2013 at 09:47:24AM +0200, Orit Wasserman wrote:
> >> On 01/31/2013 08:57 AM, Peter Lieven wrote:
> >>> Hi,
> >>>
> >>> I just came across an idea and would like to have feedback if
On Thu, Jan 31, 2013 at 4:42 PM, Gleb Natapov wrote:
> On Thu, Jan 31, 2013 at 04:36:25PM +0200, Avi Kivity wrote:
>> On Thu, Jan 31, 2013 at 4:30 PM, Gleb Natapov wrote:
>> >> >
>> >> > Avi/Michael do you remember why mincore can't be used to check if a
>> >> > guest
>> >> page is unmapped?
>>
On Jan 31, 2013 4:03 PM, "Peter Lieven" wrote:
>
>
> Am 31.01.2013 um 14:59 schrieb Avi Kivity :
>
>>
>> On Jan 31, 2013 12:29 PM, "Orit Wasserman" wrote:
>> >
>> > On 01/31/2013 11:48 AM, Gleb Natapov wrote:
>> > > On Thu, Jan 31, 2013 at 09:47:24AM +0200, Orit Wasserman wrote:
>> > >> On 01/31/
On Thu, Jan 31, 2013 at 4:30 PM, Gleb Natapov wrote:
>> >
>> > Avi/Michael do you remember why mincore can't be used to check if a guest
>> page is unmapped?
>>
>> A page may be not in core, but also nonzero (for example swap).
> Yes, mincore() should not be used as zero page check, but it can be
What about using the linux pagemap?
With RDMA, I have exactly this problem. The cost of mapping and faulting
and checking for zeros is higher than the cost of simply dumping the
page into remote memory on the server side.
If we could avoid accessing the page, it was save huge amounts of time.
On Thu, Jan 31, 2013 at 04:36:25PM +0200, Avi Kivity wrote:
> On Thu, Jan 31, 2013 at 4:30 PM, Gleb Natapov wrote:
> >> >
> >> > Avi/Michael do you remember why mincore can't be used to check if a guest
> >> page is unmapped?
> >>
> >> A page may be not in core, but also nonzero (for example swap)
On Thu, Jan 31, 2013 at 03:59:23PM +0200, Avi Kivity wrote:
> On Jan 31, 2013 12:29 PM, "Orit Wasserman" wrote:
> >
> > On 01/31/2013 11:48 AM, Gleb Natapov wrote:
> > > On Thu, Jan 31, 2013 at 09:47:24AM +0200, Orit Wasserman wrote:
> > >> On 01/31/2013 08:57 AM, Peter Lieven wrote:
> > >>> Hi,
>
Am 31.01.2013 um 14:59 schrieb Avi Kivity :
>
> On Jan 31, 2013 12:29 PM, "Orit Wasserman" wrote:
> >
> > On 01/31/2013 11:48 AM, Gleb Natapov wrote:
> > > On Thu, Jan 31, 2013 at 09:47:24AM +0200, Orit Wasserman wrote:
> > >> On 01/31/2013 08:57 AM, Peter Lieven wrote:
> > >>> Hi,
> > >>>
> >
RFC patch is attached. Comments appreciated.
I have two concerns left:
a) what happens if a page turns from zero to non-zero in the first stage. Is
this page transferred in the same round or in the next?
b) what happens if live migration fails or is aborted and then again
a migration is started to
On 01/31/2013 11:48 AM, Gleb Natapov wrote:
> On Thu, Jan 31, 2013 at 09:47:24AM +0200, Orit Wasserman wrote:
>> On 01/31/2013 08:57 AM, Peter Lieven wrote:
>>> Hi,
>>>
>>> I just came across an idea and would like to have feedback if it makes
>>> sence or not.
>>>
>>> If a VM is started without p
On Thu, Jan 31, 2013 at 09:47:24AM +0200, Orit Wasserman wrote:
> On 01/31/2013 08:57 AM, Peter Lieven wrote:
> > Hi,
> >
> > I just came across an idea and would like to have feedback if it makes
> > sence or not.
> >
> > If a VM is started without preallocated memory all memory that has not be
On 01/31/2013 10:10 AM, Peter Lieven wrote:
>
> Am 31.01.2013 um 08:47 schrieb Orit Wasserman :
>
>> On 01/31/2013 08:57 AM, Peter Lieven wrote:
>>> Hi,
>>>
>>> I just came across an idea and would like to have feedback if it makes
>>> sence or not.
>>>
>>> If a VM is started without preallocate
Am 31.01.2013 um 08:47 schrieb Orit Wasserman :
> On 01/31/2013 08:57 AM, Peter Lieven wrote:
>> Hi,
>>
>> I just came across an idea and would like to have feedback if it makes sence
>> or not.
>>
>> If a VM is started without preallocated memory all memory that has not been
>> written to
>>
On 01/31/2013 08:57 AM, Peter Lieven wrote:
> Hi,
>
> I just came across an idea and would like to have feedback if it makes sence
> or not.
>
> If a VM is started without preallocated memory all memory that has not been
> written to
> reads as zeros, right?
Hi,
No the memory will be unmapped (
Hi,
I just came across an idea and would like to have feedback if it makes sence or
not.
If a VM is started without preallocated memory all memory that has not been
written to
reads as zeros, right?
If a VM with a lot of unwritten memory is migrated or if the memory contains a
lot
of zeroed o
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