This patch set provides a new method for throttling a vcpu and makes use of said method to dynamically increase cpu throttling during an autoconverge migration until the migration completes.
This work is related to the following discussion: https://lists.gnu.org/archive/html/qemu-devel/2015-03/msg00287.html Changelog ----------- v6 - Updated all refs to Qemu v2.4 to 2.5. - Corrected error in API documentation. - Added default values to .json documentation v5 - Add cpu->throttle_thread_scheduled flag to prevent callbacks from stacking up - Correct error in formula used to reset the timer - Add atomic operations to protect throttle_percentage - Make use of cpu_throttle_get_percentage() instead of accessing data directly - Various small formatting/style fixes v4 - Switch to a static timer - Use QEMU_CLOCK_VIRTUAL_RT instead of QEMU_CLOCK_REALTIME - Get rid of throttle_timer_stop, use throttle_percentage = 0 instead - Calculate throttle_ratio directly in cpu_throttle_thread - Consolidate timer mod operations to single function - Remove some unneeded cpu_throttle_active() checks - Check for throttle_percentage == 0 in cpu_throttle_thread - Change throttle_percentage to unsigned int - Renamed cpu_throttle_timer_pop to cpu_throttle_timer_tick v3 - Cpu throttling parameters moved from CPUState to global scope - Throttling interface now uses a percentage instead of ratio - Migration parameters added to allow tweaking of how aggressive throttling is - Add throttle active check to the throttle stop routine. - Remove asserts from throttle start/stop functions and instead force the input to fall within the acceptable range - Rename cpu_throttle_start to cpu_throttle_set to better describe its purpose - Remove unneeded object casts - Fixed monitor output formatting - Comment cleanups v2 - Add cpu throttle ratio output to hmp/qmp info/query migrate commands v1 - Initial Jason J. Herne (5): cpu: Provide vcpu throttling interface migration: Parameters for auto-converge cpu throttling migration: Dynamic cpu throttling for auto-converge qmp/hmp: Add throttle ratio to query-migrate and info migrate migration: Disambiguate MAX_THROTTLE arch_init.c | 88 ++++++++++++++++++--------------------------------- cpus.c | 78 +++++++++++++++++++++++++++++++++++++++++++++ hmp.c | 21 ++++++++++++ include/qom/cpu.h | 42 ++++++++++++++++++++++++ migration/migration.c | 57 +++++++++++++++++++++++++++++++-- qapi-schema.json | 40 ++++++++++++++++++++--- 6 files changed, 262 insertions(+), 64 deletions(-) -- 1.9.1
