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charset="utf-8" Reviewed-by: Dr. David Alan Gilbert Signed-off-by: Alexey Perevalov --- docs/devel/migration.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/docs/devel/migration.txt b/docs/devel/migration.txt index 1b940a8..4b625ca 100644 --- a/docs/devel/migration.txt +++ b/docs/devel/migration.txt @@ -402,6 +402,16 @@ will now cause the transition from precopy to postcopy. It can be issued immediately after migration is started or any time later on. Issuing it after the end of a migration is harmless. =20 +Blocktime is a postcopy live migration metric, intended to show +how long the vCPU was in state of interruptable sleep due to pagefault. +This value is calculated on destination side. +To enable postcopy blocktime calculation, enter following command on desti= nation +monitor: + +migrate_set_capability postcopy-blocktime on + +Postcopy blocktime can be retrieved by query-migrate qmp command. + Note: During the postcopy phase, the bandwidth limits set using migrate_set_speed is ignored (to avoid delaying requested pages that the destination is waiting for). --=20 1.9.1