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The issues about architecture of the COLO checkpoint

From: Daniel Cho
Subject: The issues about architecture of the COLO checkpoint
Date: Tue, 11 Feb 2020 14:30:03 +0800

Hi everyone, 
     We have some issues about setting COLO feature. Hope somebody could give us some advice.

Issue 1:
     We dynamic to set COLO feature for PVM(2 core, 16G memory),  but the Primary VM will pause a long time(based on memory size) for waiting SVM start. Does it have any idea to reduce the pause time?

Issue 2:
     In https://github.com/qemu/qemu/blob/master/migration/colo.c#L503, could we move start_vm() before Line 488? Because at first checkpoint PVM will wait for SVM's reply, it cause PVM stop for a while. 

     We set the COLO feature on running VM, so we hope the running VM could continuous service for users. 
Do you have any suggestions for those issues? 

Best regards,
Daniel Cho 

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