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qemu: Resolve issue with GetScheduler APIs for non running domain

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As a consequence of the cgroup layout changes from commit '632f78ca', the
qemuDomainGetSchedulerParameters[Flags]()' and qemuGetSchedulerType() APIs
failed to return data for a non running domain.  This can be seen through
a 'virsh schedinfo <domain>' command which returns:

Scheduler      : Unknown
error: Requested operation is not valid: cgroup CPU controller is not mounted

Prior to that change a non running domain would return:

Scheduler      : posix
cpu_shares     : 0
vcpu_period    : 0
vcpu_quota     : 0
emulator_period: 0
emulator_quota : 0

This patch will restore the capability to return configuration only data
for a non running domain regardless of whether cgroups are available.
This commit is contained in:
John Ferlan 2013-05-28 14:52:39 -04:00
parent 75c787326d
commit b237545341
1 changed files with 10 additions and 1 deletions
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11
src/qemu/qemu_driver.c
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@ -7065,6 +7065,14 @@ static char *qemuDomainGetSchedulerType(virDomainPtr dom,
}
priv = vm->privateData;
/* Domain not running, thus no cgroups - return defaults */
if (!virDomainObjIsActive(vm)) {
if (nparams)
*nparams = 5;
ignore_value(VIR_STRDUP(ret, "posix"));
goto cleanup;
}
if (!virCgroupHasController(priv->cgroup, VIR_CGROUP_CONTROLLER_CPU)) {
virReportError(VIR_ERR_OPERATION_INVALID,
"%s", _("cgroup CPU controller is not mounted"));
@ -8477,11 +8485,12 @@ qemuDomainGetSchedulerParametersFlags(virDomainPtr dom,
if (flags & VIR_DOMAIN_AFFECT_CONFIG) {
shares = persistentDef->cputune.shares;
if (*nparams > 1 && cpu_bw_status) {
if (*nparams > 1) {
period = persistentDef->cputune.period;
quota = persistentDef->cputune.quota;
emulator_period = persistentDef->cputune.emulator_period;
emulator_quota = persistentDef->cputune.emulator_quota;
cpu_bw_status = true; /* Allow copy of data to params[] */
}
goto out;
}