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qemu: support of emulator_period and emulator_quota's modification

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allow the user change/get emulator's period and quota when the vm is running.
This commit is contained in:
Wen Congyang 2012-08-21 17:18:44 +08:00 committed by Daniel Veillard
parent e051c482aa
commit 5065942019
1 changed files with 132 additions and 1 deletions
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133
src/qemu/qemu_driver.c
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@ -6600,7 +6600,7 @@ static char *qemuGetSchedulerType(virDomainPtr dom,
else if (rc == 0)
*nparams = 1;
else
*nparams = 3;
*nparams = 5;
}
ret = strdup("posix");
@ -7730,6 +7730,40 @@ cleanup:
return -1;
}
static int
qemuSetEmulatorBandwidthLive(virDomainObjPtr vm, virCgroupPtr cgroup,
unsigned long long period, long long quota)
{
qemuDomainObjPrivatePtr priv = vm->privateData;
virCgroupPtr cgroup_emulator = NULL;
int rc;
if (period == 0 && quota == 0)
return 0;
if (priv->nvcpupids == 0 || priv->vcpupids[0] == vm->pid) {
return 0;
}
rc = virCgroupForEmulator(cgroup, &cgroup_emulator, 0);
if (rc < 0) {
virReportSystemError(-rc,
_("Unable to find emulator cgroup for %s"),
vm->def->name);
goto cleanup;
}
if (qemuSetupCgroupVcpuBW(cgroup_emulator, period, quota) < 0)
goto cleanup;
virCgroupFree(&cgroup_emulator);
return 0;
cleanup:
virCgroupFree(&cgroup_emulator);
return -1;
}
static int
qemuSetSchedulerParametersFlags(virDomainPtr dom,
virTypedParameterPtr params,
@ -7753,6 +7787,10 @@ qemuSetSchedulerParametersFlags(virDomainPtr dom,
VIR_TYPED_PARAM_ULLONG,
VIR_DOMAIN_SCHEDULER_VCPU_QUOTA,
VIR_TYPED_PARAM_LLONG,
VIR_DOMAIN_SCHEDULER_EMULATOR_PERIOD,
VIR_TYPED_PARAM_ULLONG,
VIR_DOMAIN_SCHEDULER_EMULATOR_QUOTA,
VIR_TYPED_PARAM_LLONG,
NULL) < 0)
return -1;
@ -7835,6 +7873,32 @@ qemuSetSchedulerParametersFlags(virDomainPtr dom,
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
vmdef->cputune.quota = params[i].value.l;
}
} else if (STREQ(param->field, VIR_DOMAIN_SCHEDULER_EMULATOR_PERIOD)) {
if (flags & VIR_DOMAIN_AFFECT_LIVE) {
rc = qemuSetEmulatorBandwidthLive(vm, group, params[i].value.ul, 0);
if (rc != 0)
goto cleanup;
if (params[i].value.ul)
vm->def->cputune.emulator_period = params[i].value.ul;
}
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
vmdef->cputune.emulator_period = params[i].value.ul;
}
} else if (STREQ(param->field, VIR_DOMAIN_SCHEDULER_EMULATOR_QUOTA)) {
if (flags & VIR_DOMAIN_AFFECT_LIVE) {
rc = qemuSetEmulatorBandwidthLive(vm, group, 0, params[i].value.l);
if (rc != 0)
goto cleanup;
if (params[i].value.l)
vm->def->cputune.emulator_quota = params[i].value.l;
}
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
vmdef->cputune.emulator_quota = params[i].value.l;
}
}
}
@ -7938,6 +8002,43 @@ cleanup:
return ret;
}
static int
qemuGetEmulatorBandwidthLive(virDomainObjPtr vm, virCgroupPtr cgroup,
unsigned long long *period, long long *quota)
{
virCgroupPtr cgroup_emulator = NULL;
qemuDomainObjPrivatePtr priv = NULL;
int rc;
int ret = -1;
priv = vm->privateData;
if (priv->nvcpupids == 0 || priv->vcpupids[0] == vm->pid) {
/* We don't create sub dir for each vcpu */
*period = 0;
*quota = 0;
return 0;
}
/* get period and quota for emulator */
rc = virCgroupForEmulator(cgroup, &cgroup_emulator, 0);
if (!cgroup_emulator) {
virReportSystemError(-rc,
_("Unable to find emulator cgroup for %s"),
vm->def->name);
goto cleanup;
}
rc = qemuGetVcpuBWLive(cgroup_emulator, period, quota);
if (rc < 0)
goto cleanup;
ret = 0;
cleanup:
virCgroupFree(&cgroup_emulator);
return ret;
}
static int
qemuGetSchedulerParametersFlags(virDomainPtr dom,
virTypedParameterPtr params,
@ -7950,6 +8051,8 @@ qemuGetSchedulerParametersFlags(virDomainPtr dom,
unsigned long long shares;
unsigned long long period;
long long quota;
unsigned long long emulator_period;
long long emulator_quota;
int ret = -1;
int rc;
bool cpu_bw_status = false;
@ -7989,6 +8092,8 @@ qemuGetSchedulerParametersFlags(virDomainPtr dom,
if (*nparams > 1 && cpu_bw_status) {
period = persistentDef->cputune.period;
quota = persistentDef->cputune.quota;
emulator_period = persistentDef->cputune.emulator_period;
emulator_quota = persistentDef->cputune.emulator_quota;
}
goto out;
}
@ -8017,6 +8122,14 @@ qemuGetSchedulerParametersFlags(virDomainPtr dom,
if (rc != 0)
goto cleanup;
}
if (*nparams > 3 && cpu_bw_status) {
rc = qemuGetEmulatorBandwidthLive(vm, group, &emulator_period,
&emulator_quota);
if (rc != 0)
goto cleanup;
}
out:
if (virTypedParameterAssign(&params[0], VIR_DOMAIN_SCHEDULER_CPU_SHARES,
VIR_TYPED_PARAM_ULLONG, shares) < 0)
@ -8039,6 +8152,24 @@ out:
goto cleanup;
saved_nparams++;
}
if (*nparams > saved_nparams) {
if (virTypedParameterAssign(&params[3],
VIR_DOMAIN_SCHEDULER_EMULATOR_PERIOD,
VIR_TYPED_PARAM_ULLONG,
emulator_period) < 0)
goto cleanup;
saved_nparams++;
}
if (*nparams > saved_nparams) {
if (virTypedParameterAssign(&params[4],
VIR_DOMAIN_SCHEDULER_EMULATOR_QUOTA,
VIR_TYPED_PARAM_LLONG,
emulator_quota) < 0)
goto cleanup;
saved_nparams++;
}
}
*nparams = saved_nparams;