From 1d58872a910cdfe8df79be5ffb4c4c6c13768f40 Mon Sep 17 00:00:00 2001 From: Xiao Guangrong Date: Tue, 21 Aug 2018 16:10:20 +0800 Subject: 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 Signed-off-by: Xiao Guangrong Reviewed-by: Juan Quintela Signed-off-by: Juan Quintela --- qapi/migration.json | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'qapi') 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', -- cgit v1.2.3