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docs/devel/migration: start a debugging section

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Explain how to use analyze-migration.py, this may help.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20200330174852.456148-1-marcandre.lureau@redhat.com>
Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Marc-André Lureau 2020-03-30 19:48:52 +02:00 committed by Dr. David Alan Gilbert
parent 7ac5529afb
commit 979da8b357
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docs/devel/migration.rst
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@ -50,6 +50,26 @@ All these migration protocols use the same infrastructure to
save/restore state devices. This infrastructure is shared with the
savevm/loadvm functionality.
Debugging
=========
The migration stream can be analyzed thanks to `scripts/analyze_migration.py`.
Example usage:
.. code-block:: shell
$ qemu-system-x86_64
(qemu) migrate "exec:cat > mig"
$ ./scripts/analyze_migration.py -f mig
{
"ram (3)": {
"section sizes": {
"pc.ram": "0x0000000008000000",
...
See also ``analyze_migration.py -h`` help for more options.
Common infrastructure
=====================