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[Qemu-devel] [PULL 10/14] migration: postcopy_blocktime documentation
From: |
Juan Quintela |
Subject: |
[Qemu-devel] [PULL 10/14] migration: postcopy_blocktime documentation |
Date: |
Wed, 3 Jan 2018 10:38:30 +0100 |
From: Alexey Perevalov <address@hidden>
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Alexey Perevalov <address@hidden>
Reviewed-by: Juan Quintela <address@hidden>
Signed-off-by: Juan Quintela <address@hidden>
---
docs/devel/migration.rst | 14 ++++++++++++++
1 file changed, 14 insertions(+)
diff --git a/docs/devel/migration.rst b/docs/devel/migration.rst
index bf97080dac..015a9ebdf7 100644
--- a/docs/devel/migration.rst
+++ b/docs/devel/migration.rst
@@ -401,6 +401,20 @@ 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 vCPU was in state of interruptable sleep due to pagefault.
+That metric is calculated both for all vCPUs as overlapped value, and
+separately for each vCPU. These values are 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.
+postcopy-blocktime value of qmp command will show overlapped blocking
+time for all vCPU, postcopy-vcpu-blocktime will show list of blocking
+time per vCPU.
+
.. note::
During the postcopy phase, the bandwidth limits set using
``migrate_set_speed`` is ignored (to avoid delaying requested pages that
--
2.14.3
- [Qemu-devel] [PULL 01/14] migration: Use proper types in json, (continued)
- [Qemu-devel] [PULL 01/14] migration: Use proper types in json, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 03/14] migration: free addr in the same function that we created it, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 02/14] migration: print features as on off, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 05/14] migration: free result string, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 06/14] migration: fix analyze-migration.py script with radix table, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 04/14] docs: Convert migration.txt to rst, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 07/14] migration: introduce postcopy-blocktime capability, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 08/14] migration: add postcopy blocktime ctx into MigrationIncomingState, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 09/14] migration: calculate vCPU blocktime on dst side, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 11/14] migration: add blocktime calculation into migration-test, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 10/14] migration: postcopy_blocktime documentation,
Juan Quintela <=
- [Qemu-devel] [PULL 12/14] migration: add postcopy total blocktime into query-migrate, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 13/14] migration: Guard ram_bytes_remaining against early call, Juan Quintela, 2018/01/03
- [Qemu-devel] [PULL 14/14] migration: finalize current_migration object, Juan Quintela, 2018/01/03
- Re: [Qemu-devel] [PULL 00/14] Migration pull request, Eric Blake, 2018/01/04
- Re: [Qemu-devel] [PULL 00/14] Migration pull request, Peter Maydell, 2018/01/11