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| author | Xiao Guangrong | 2018-08-21 10:10:20 +0200 |
|---|---|---|
| committer | Juan Quintela | 2018-08-22 12:34:11 +0200 |
| commit | 1d58872a910cdfe8df79be5ffb4c4c6c13768f40 (patch) | |
| tree | e9512fe2fb45ad8555dcda61f2ee40314889e790 /qapi | |
| parent | migration: poll the cm event for destination qemu (diff) | |
| download | qemu-1d58872a910cdfe8df79be5ffb4c4c6c13768f40.tar.gz qemu-1d58872a910cdfe8df79be5ffb4c4c6c13768f40.tar.xz qemu-1d58872a910cdfe8df79be5ffb4c4c6c13768f40.zip | |
migration: do not wait for free thread
Instead of putting the main thread to sleep state to wait for
free compression thread, we can directly post it out as normal
page that reduces the latency and uses CPUs more efficiently
A parameter, compress-wait-thread, is introduced, it can be
enabled if the user really wants the old behavior
Reviewed-by: Peter Xu <peterx@redhat.com>
Signed-off-by: Xiao Guangrong <xiaoguangrong@tencent.com>
Reviewed-by: Juan Quintela <quintela@redhat.com>
Signed-off-by: Juan Quintela <quintela@redhat.com>
Diffstat (limited to 'qapi')
| -rw-r--r-- | qapi/migration.json | 18 |
1 files changed, 18 insertions, 0 deletions
diff --git a/qapi/migration.json b/qapi/migration.json index cabe234c36..f62d3f9a4b 100644 --- a/qapi/migration.json +++ b/qapi/migration.json @@ -461,6 +461,11 @@ # @compress-threads: Set compression thread count to be used in live migration, # the compression thread count is an integer between 1 and 255. # +# @compress-wait-thread: Controls behavior when all compression threads are +# currently busy. If true (default), wait for a free +# compression thread to become available; otherwise, +# send the page uncompressed. (Since 3.1) +# # @decompress-threads: Set decompression thread count to be used in live # migration, the decompression thread count is an integer between 1 # and 255. Usually, decompression is at least 4 times as fast as @@ -529,6 +534,7 @@ ## { 'enum': 'MigrationParameter', 'data': ['compress-level', 'compress-threads', 'decompress-threads', + 'compress-wait-thread', 'cpu-throttle-initial', 'cpu-throttle-increment', 'tls-creds', 'tls-hostname', 'max-bandwidth', 'downtime-limit', 'x-checkpoint-delay', 'block-incremental', @@ -543,6 +549,11 @@ # # @compress-threads: compression thread count # +# @compress-wait-thread: Controls behavior when all compression threads are +# currently busy. If true (default), wait for a free +# compression thread to become available; otherwise, +# send the page uncompressed. (Since 3.1) +# # @decompress-threads: decompression thread count # # @cpu-throttle-initial: Initial percentage of time guest cpus are @@ -617,6 +628,7 @@ { 'struct': 'MigrateSetParameters', 'data': { '*compress-level': 'int', '*compress-threads': 'int', + '*compress-wait-thread': 'bool', '*decompress-threads': 'int', '*cpu-throttle-initial': 'int', '*cpu-throttle-increment': 'int', @@ -657,6 +669,11 @@ # # @compress-threads: compression thread count # +# @compress-wait-thread: Controls behavior when all compression threads are +# currently busy. If true (default), wait for a free +# compression thread to become available; otherwise, +# send the page uncompressed. (Since 3.1) +# # @decompress-threads: decompression thread count # # @cpu-throttle-initial: Initial percentage of time guest cpus are @@ -727,6 +744,7 @@ { 'struct': 'MigrationParameters', 'data': { '*compress-level': 'uint8', '*compress-threads': 'uint8', + '*compress-wait-thread': 'bool', '*decompress-threads': 'uint8', '*cpu-throttle-initial': 'uint8', '*cpu-throttle-increment': 'uint8', |