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X-Received-From: 210.118.77.14 Subject: [Qemu-devel] [PATCH V6 10/10] migration: postcopy_blocktime documentation X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: i.maximets@samsung.com, dgilbert@redhat.com, peterx@redhat.com, Alexey Perevalov Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: "Qemu-devel" Signed-off-by: Alexey Perevalov Reviewed-by: Dr. David Alan Gilbert --- docs/migration.txt | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/docs/migration.txt b/docs/migration.txt index 1b940a8..2207c6d 100644 --- a/docs/migration.txt +++ b/docs/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. +Blocktime is a postcopy live migration metric, intended to show +how long the source 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 destination +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).