The default max cpu throttle is 99, this is too big that may
influence the guest loads. Add a qmp to config it can make it
more flexible.
Signed-off-by: Li Qiang <liq...@gmail.com>
---
cpus.c | 5 +++++
include/qom/cpu.h | 8 ++++++++
migration/migration.c | 10 ++++++++++
qapi/migration.json | 13 +++++++++++++
4 files changed, 36 insertions(+)
diff --git a/cpus.c b/cpus.c
index 6569c73d24..0505477086 100644
--- a/cpus.c
+++ b/cpus.c
@@ -765,6 +765,11 @@ void cpu_throttle_set(int new_throttle_pct)
CPU_THROTTLE_TIMESLICE_NS);
}
+void set_cpu_max_throttle(int64_t max_pct)
+{
+ throttle_percentage_max = max_pct;
+}
+
void cpu_throttle_stop(void)
{
atomic_set(&throttle_percentage, 0);
diff --git a/include/qom/cpu.h b/include/qom/cpu.h
index bd796579ee..4328d2e8ad 100644
--- a/include/qom/cpu.h
+++ b/include/qom/cpu.h
@@ -816,6 +816,14 @@ CPUState *cpu_by_arch_id(int64_t id);
void cpu_throttle_set(int new_throttle_pct);
/**
+ * set_cpu_max_throttle:
+ * @max_pct: the max percent of sleep time. Valid range is 1 to 99.
+ *
+ * Set the max throttle percentage.
+ */
+void set_cpu_max_throttle(int64_t max_pct);
+
+/**
* cpu_throttle_stop:
*
* Stops the vcpu throttling started by cpu_throttle_set.
diff --git a/migration/migration.c b/migration/migration.c
index b7d9854bda..9c7a6f7477 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -1774,6 +1774,16 @@ void qmp_migrate_set_speed(int64_t value, Error **errp)
qmp_migrate_set_parameters(&p, errp);
}
+void qmp_migrate_set_max_cpu_throttle(int64_t value, Error **errp)
+{
+ if (value > 99 || value < 1) {
+ error_setg(errp, QERR_INVALID_PARAMETER_VALUE, " max cpu throttle",
+ "not in 1 between 99");
+ return;
+ }
+ set_cpu_max_throttle(value);
+}
+
void qmp_migrate_set_downtime(double value, Error **errp)
{
if (value < 0 || value > MAX_MIGRATE_DOWNTIME_SECONDS) {
diff --git a/qapi/migration.json b/qapi/migration.json
index 186e8a7303..2ef3ddfe43 100644
--- a/qapi/migration.json
+++ b/qapi/migration.json
@@ -997,6 +997,19 @@
{ 'command': 'migrate_set_speed', 'data': {'value': 'int'} }
##
+# @migrate_set_max_cpu_throttle:
+#
+# Set maximum cpu throttle for migration.
+#
+# @value: maximum cpu throttle.
+#
+# Returns: nothing on success
+#
+# Since: 2.12
+##
+{ 'command': 'migrate_set_max_cpu_throttle', 'data': {'value': 'int'} }
+
+##
# @migrate-set-cache-size:
#
# Set cache size to be used by XBZRLE migration
--
2.11.0
