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[Qemu-devel] [PATCH V4 9/9] migration: postcopy_blocktime documentation
From: |
Alexey Perevalov |
Subject: |
[Qemu-devel] [PATCH V4 9/9] migration: postcopy_blocktime documentation |
Date: |
Fri, 12 May 2017 14:31:43 +0300 |
Signed-off-by: Alexey Perevalov <address@hidden>
---
docs/migration.txt | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/docs/migration.txt b/docs/migration.txt
index 1b940a8..d0f5a6d 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 it's a postcopy live migration metric, intend to show
+when source vCPU was in state 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 could 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).
--
1.8.3.1