always happens without checkpoint. We can rework
this in the next revisions, if it's required. One option would not to
to store hashes in the migration destination, but to load the
checkpoint explicitly in the migration source before migration.
--
With best regards,
Bohdan Trach
Extend memory page saving and loading functions to utilize information
available in checkpoints to avoid sending full pages over the network.
Signed-off-by: Bohdan Trach
---
migration/ram.c | 131
trace-events| 5 +++
2 files
-assisted migration feature as
proposed earlier on this list [1]. It allows reusing existing memory
snapshots of guests to speed up migration of VMs between physical
hosts.
[1] https://lists.gnu.org/archive/html/qemu-devel/2015-04/msg01555.html
Bohdan Trach (2):
migration: implement checkpoint
This commit adds functions used to open the checkpoint saved by the
dump-guest-memory command and populate the hash table used by the
checkpoint-assisted migration mechanism. SHA256 is used to checkpoint
the pages. Only ELF memory dump format is supported at the moment.
Signed-off-by: Bohdan
ASH flag?
>
Sorry for not stating this clear enough. We will remove this flag from
the code, and send pages with SAVE_FLAG_PAGE instead. In this case the
destination will compute the hash.
> --
> Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
>
--
With best regards,
Bohdan Trach
uaranteed to resend the page again if it was
> written
> to, but that still doesn't make these two things match; although as I say
> above
> I'm not sure why SAVE_FLAG_PAGE_HASH exists.
This is true. In this case, we will just delete the SAVE_FLAG_PAGE_HASH flag.
> --
Hi David, thank you for the feedback!
On 11/16/2015 05:46 PM, Dr. David Alan Gilbert wrote:
> * Bohdan Trach (bv.tr...@gmail.com) wrote:
>> From: Bohdan Trach
>>
>> dump-pc-mem command is added for checkpointing guest memory to
>> file. Only system RAM region is save
the same
> VM or one where the page got moved but unchanged?
Here we check if the size of the main memory block matches the
checkpoint. As we didn't use any format, we wanted to detect at least
some cases where a checkpoint from a different VM is passed to Qemu by
accident.
> --
> Dr. David Alan Gilbert / dgilb...@redhat.com / Manchester, UK
>
--
With best regards,
Bohdan Trach
://patchwork.ozlabs.org/patch/462045/
Description:
https://lists.gnu.org/archive/html/qemu-devel/2015-04/msg01555.html
https://lists.gnu.org/archive/html/qemu-devel/2015-04/msg02014.html
--
With best regards,
Bohdan Trach
On 06/09/2015 12:00 PM, Bohdan Trach wrote:
> Ping.
>
> The patches ar
.html
Also, this code is being extended to also optionally use deduplication and dirty
page tracking to save even more bandwidth.
--
With best regards,
Bohdan Trach
On 05/11/2015 01:13 PM, Amit Shah wrote:
> On (Fri) 24 Apr 2015 [13:38:54], Bohdan Trach wrote:
>> Ping.
>
> It's
Trach wrote:
> From: Bohdan Trach
>
> This patchset contains a checkpoint-assisted migration feature as
> proposed earlier on this list [1]. It allows reusing existing memory
> snapshots of guests to speed up migration of VMs between physical
> hosts.
>
> [1] https://li
Thank You for the review.
Please see comments inline.
On 04/17/2015 03:53 PM, Eric Blake wrote:
> On 04/17/2015 06:13 AM, Bohdan Trach wrote:
>> From: Bohdan Trach
>>
>> dump-pc-mem command is added for checkpointing guest memory to
>> file. Only system RAM region i
From: Bohdan Trach
Extend memory page saving and loading functions to utilize information
available in checkpoints to avoid sending full pages over the network.
Signed-off-by: Bohdan Trach
---
arch_init.c | 167
1 file changed, 158
From: Bohdan Trach
dump-pc-mem command is added for checkpointing guest memory to
file. Only system RAM region is saved. This checkpoint is later used to
recover unchanged pages.
Signed-off-by: Bohdan Trach
---
arch_init.c | 19 +++
hmp-commands.hx | 16
From: Bohdan Trach
This commit adds functions, which are used to work with checkpoint
files. A new command-line option `-checkpoint` is added, which is used
to specify the checkpoint file. Currently, MD5 function from OpenSSL is
used to checkpoint memory.
Signed-off-by: Bohdan Trach
From: Bohdan Trach
This patchset contains a checkpoint-assisted migration feature as
proposed earlier on this list [1]. It allows reusing existing memory
snapshots of guests to speed up migration of VMs between physical
hosts.
[1] https://lists.gnu.org/archive/html/qemu-devel/2015-04/msg01555
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