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| author | Peter Maydell <peter.maydell@linaro.org> | 2018-04-26 09:12:31 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2018-04-26 09:12:31 +0100 |
| commit | 8e383d19b4486355630c78944e4751fb953bef1c (patch) | |
| tree | 42c4c011809846a34e6204771cebf347e723e8d2 /docs/devel | |
| parent | 4743c23509a51bd4ee85cc272287a41917d1be35 (diff) | |
| parent | da3f56cb2e767016d3f204837a77caf35b463f90 (diff) | |
| download | qemu-8e383d19b4486355630c78944e4751fb953bef1c.zip qemu-8e383d19b4486355630c78944e4751fb953bef1c.tar.gz qemu-8e383d19b4486355630c78944e4751fb953bef1c.tar.bz2 | |
Merge remote-tracking branch 'remotes/dgilbert/tags/pull-migration-20180425a' into staging
Migration pull for 2.13
Alexey Perevalov postcopy blocktime statistics
Xiao Guangrong's compression performance improvements
# gpg: Signature made Wed 25 Apr 2018 20:21:13 BST
# gpg: using RSA key 0516331EBC5BFDE7
# gpg: Good signature from "Dr. David Alan Gilbert (RH2) <dgilbert@redhat.com>"
# Primary key fingerprint: 45F5 C71B 4A0C B7FB 977A 9FA9 0516 331E BC5B FDE7
* remotes/dgilbert/tags/pull-migration-20180425a:
migration: remove ram_save_compressed_page()
migration: introduce save_normal_page()
migration: move calling save_zero_page to the common place
migration: move calling control_save_page to the common place
migration: move some code to ram_save_host_page
migration: introduce control_save_page()
migration: detect compression and decompression errors
migration: stop decompression to allocate and free memory frequently
migration: stop compression to allocate and free memory frequently
migration: stop compressing page in migration thread
migration: add postcopy total blocktime into query-migrate
migration: add blocktime calculation into migration-test
migration: postcopy_blocktime documentation
migration: calculate vCPU blocktime on dst side
migration: add postcopy blocktime ctx into MigrationIncomingState
migration: introduce postcopy-blocktime capability
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'docs/devel')
| -rw-r--r-- | docs/devel/migration.rst | 14 |
1 files changed, 14 insertions, 0 deletions
diff --git a/docs/devel/migration.rst b/docs/devel/migration.rst index e32b087..9342a8a 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 |