Re: [PATCH 0/3] migration: Downtime tracepoints

[Peter Xu]

On Mon, Oct 30, 2023 at 11:13:55AM -0400, Peter Xu wrote:
> > Perhaps it is easy to wrap the checkpoint tracepoint in its own function to
> > allow extension of something else e.g. add the timestamp (or any other data 
> > into
> > the checkpoints) or do something in a particular checkpoint of the 
> > migration.
> > The timing function from qemu would give qemu own idea of time (directly
> > correlable with the downtime metric that applications consume) which would 
> > be
> > more consistent? though I am at too minds on this whether to rely on tracing
> > stamps or align with what's provided to applications.
> 
> Yes it should be more consistent.  Let me add them into the checkpoints.

I just noticed dst qemu doesn't have downtime_start to offset..  Only
offset the src downtime checkpoints will make it less consistent.  I'll
leave this one for later.  Posting a new version soon.

-- 
Peter Xu