0e21bf2460
use dirty ring feature to implement dirtyrate calculation. introduce mode option in qmp calc_dirty_rate to specify what method should be used when calculating dirtyrate, either page-sampling or dirty-ring should be passed. introduce "dirty_ring:-r" option in hmp calc_dirty_rate to indicate dirty ring method should be used for calculation. Signed-off-by: Hyman Huang(黄勇) <huangy81@chinatelecom.cn> Message-Id: <7db445109bd18125ce8ec86816d14f6ab5de6a7d.1624040308.git.huangy81@chinatelecom.cn> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Juan Quintela <quintela@redhat.com> Signed-off-by: Juan Quintela <quintela@redhat.com>