From: Xiao Guangrong <address@hidden>
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
Signed-off-by: Xiao Guangrong <address@hidden>
---
+++ b/qapi/migration.json
@@ -462,6 +462,11 @@
# @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: Wait if no thread is free to compress the memory page
+# if it's enabled, otherwise, the page will be posted out immediately
+# in the main thread without compression. It's true on default.
+# (Since: 3.1)