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lxc: Resolve issue with GetScheduler APIs for non running domain

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As a consequence of the cgroup layout changes from commit 'cfed9ad4', the
lxcDomainGetSchedulerParameters[Flags]()' and lxcGetSchedulerType() 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.
(cherry picked from commit 38ada092d1)
This commit is contained in:
John Ferlan 2013-05-28 15:00:59 -04:00
parent 245fc93c88
commit f90b024957
1 changed files with 10 additions and 1 deletions
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11
src/lxc/lxc_driver.c
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@ -1617,6 +1617,14 @@ static char *lxcDomainGetSchedulerType(virDomainPtr dom,
}
priv = vm->privateData;
/* Domain not running, thus no cgroups - return defaults */
if (!virDomainObjIsActive(vm)) {
if (nparams)
*nparams = 3;
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"));
@ -1895,9 +1903,10 @@ lxcDomainGetSchedulerParametersFlags(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;
cpu_bw_status = true; /* Allow copy of data to params[] */
}
goto out;
}