I've not had luck with either. The application may allocate more than a single GC segment worth, so the best workaround is to detect an imminent GC and migrate

I've not had luck with either. The application may allocate more than a single GC segment worth, so the best workaround is to detect an imminent GC and migrate the workload. Unfortunately, migration would incur even more severe penalties than a typical gen2 collection.