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some reformatting / rephrasing, added see also
* All shared resources should be restored by a task with minimal PID for avoiding deadlocks.
Here are a few principles that must be taken into account while developing CRIU.
* All shared resources must be restored by the task with the lowest PID among the group to avoid deadlocks.
* No operations with file paths in restorer blob — task has restored its fs (cwd and root) and may see a different tree.
* In dumping code, any fork()+exec() should be done using the cr_system() helper to avoid interfering with victim task tracing.
== Protobuf images compatibility ==
To retain backward compatibility of protobuf image files, follow these rules:
* Don't change the numeric tags for any existing fields.
* Any new fields that you add should be optional or repeated.
* Non-required fields can be removed, as long as the tag number is not used again in your updated message type.
For more info, see [https://developers.google.com/protocol-buffers/docs/proto#updating protobuf messages updating guide].
== External links ==
* https://developers.google.com/protocol-buffers/docs/proto#updating
[[Category:Development]]