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Introduce "x-vcpu-dirty-limit-period" migration experimental parameter, which is in the range of 1 to 1000ms and used to make dirtyrate calculation period configurable. Currently with the "x-vcpu-dirty-limit-period" varies, the total time of live migration changes, test results show the optimal value of "x-vcpu-dirty-limit-period" ranges from 500ms to 1000 ms. "x-vcpu-dirty-limit-period" should be made stable once it proves best value can not be determined with developer's experiments. Signed-off-by: Hyman Huang(黄勇) <yong.huang@smartx.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Message-Id: <168618975839.6361.17407633874747688653-2@git.sr.ht> Signed-off-by: Juan Quintela <quintela@redhat.com>