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qemu: implement new BlkioParameters API

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Implement domainSetBlkioParameters and domainGetBlkioParameters for QEmu

Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
This commit is contained in:
Gui Jianfeng 2011-02-22 13:32:38 +08:00 committed by Eric Blake
parent d55aa8694e
commit f84a756eca
1 changed files with 162 additions and 2 deletions
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164
src/qemu/qemu_driver.c
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@ -109,6 +109,7 @@
# define KVM_CAP_NR_VCPUS 9 /* returns max vcpus per vm */
#endif
#define QEMU_NB_BLKIO_PARAM 1
#define timeval_to_ms(tv) (((tv).tv_sec * 1000ull) + ((tv).tv_usec / 1000))
@ -4485,6 +4486,165 @@ cleanup:
return ret;
}
static int qemuDomainSetBlkioParameters(virDomainPtr dom,
virBlkioParameterPtr params,
int nparams,
unsigned int flags)
{
struct qemud_driver *driver = dom->conn->privateData;
int i;
virCgroupPtr group = NULL;
virDomainObjPtr vm = NULL;
int ret = -1;
virCheckFlags(0, -1);
qemuDriverLock(driver);
if (!qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) {
qemuReportError(VIR_ERR_NO_SUPPORT, _("blkio cgroup isn't mounted"));
goto cleanup;
}
vm = virDomainFindByUUID(&driver->domains, dom->uuid);
if (vm == NULL) {
qemuReportError(VIR_ERR_INTERNAL_ERROR,
_("No such domain %s"), dom->uuid);
goto cleanup;
}
if (virCgroupForDomain(driver->cgroup, vm->def->name, &group, 0) != 0) {
qemuReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot find cgroup for domain %s"), vm->def->name);
goto cleanup;
}
ret = 0;
for (i = 0; i < nparams; i++) {
virBlkioParameterPtr param = &params[i];
if (STREQ(param->field, VIR_DOMAIN_BLKIO_WEIGHT)) {
int rc;
if (param->type != VIR_DOMAIN_BLKIO_PARAM_UINT) {
qemuReportError(VIR_ERR_INVALID_ARG, "%s",
_("invalid type for blkio weight tunable, expected a 'unsigned int'"));
ret = -1;
continue;
}
if (params[i].value.ui > 1000 || params[i].value.ui < 100) {
qemuReportError(VIR_ERR_INVALID_ARG, "%s",
_("out of blkio weight range."));
ret = -1;
continue;
}
rc = virCgroupSetBlkioWeight(group, params[i].value.ui);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to set blkio weight tunable"));
ret = -1;
}
} else {
qemuReportError(VIR_ERR_INVALID_ARG,
_("Parameter `%s' not supported"), param->field);
ret = -1;
}
}
cleanup:
virCgroupFree(&group);
if (vm)
virDomainObjUnlock(vm);
qemuDriverUnlock(driver);
return ret;
}
static int qemuDomainGetBlkioParameters(virDomainPtr dom,
virBlkioParameterPtr params,
int *nparams,
unsigned int flags)
{
struct qemud_driver *driver = dom->conn->privateData;
int i;
virCgroupPtr group = NULL;
virDomainObjPtr vm = NULL;
unsigned int val;
int ret = -1;
int rc;
virCheckFlags(0, -1);
qemuDriverLock(driver);
if (!qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) {
qemuReportError(VIR_ERR_NO_SUPPORT, _("blkio cgroup isn't mounted"));
goto cleanup;
}
vm = virDomainFindByUUID(&driver->domains, dom->uuid);
if (vm == NULL) {
qemuReportError(VIR_ERR_INTERNAL_ERROR,
_("No such domain %s"), dom->uuid);
goto cleanup;
}
if ((*nparams) == 0) {
/* Current number of blkio parameters supported by cgroups */
*nparams = QEMU_NB_BLKIO_PARAM;
ret = 0;
goto cleanup;
}
if ((*nparams) != QEMU_NB_BLKIO_PARAM) {
qemuReportError(VIR_ERR_INVALID_ARG,
"%s", _("Invalid parameter count"));
goto cleanup;
}
if (virCgroupForDomain(driver->cgroup, vm->def->name, &group, 0) != 0) {
qemuReportError(VIR_ERR_INTERNAL_ERROR,
_("cannot find cgroup for domain %s"), vm->def->name);
goto cleanup;
}
for (i = 0; i < *nparams; i++) {
virBlkioParameterPtr param = &params[i];
val = 0;
param->value.ui = 0;
param->type = VIR_DOMAIN_BLKIO_PARAM_UINT;
switch(i) {
case 0: /* fill blkio weight here */
rc = virCgroupGetBlkioWeight(group, &val);
if (rc != 0) {
virReportSystemError(-rc, "%s",
_("unable to get blkio weight"));
goto cleanup;
}
if (virStrcpyStatic(param->field, VIR_DOMAIN_BLKIO_WEIGHT) == NULL) {
qemuReportError(VIR_ERR_INTERNAL_ERROR,
"%s", _("Field blkio weight too long for destination"));
goto cleanup;
}
param->value.ui = val;
break;
default:
break;
/* should not hit here */
}
}
ret = 0;
cleanup:
if (group)
virCgroupFree(&group);
if (vm)
virDomainObjUnlock(vm);
qemuDriverUnlock(driver);
return ret;
}
static int qemuDomainSetMemoryParameters(virDomainPtr dom,
virMemoryParameterPtr params,
@ -6889,8 +7049,8 @@ static virDriver qemuDriver = {
qemudDomainSetMemoryFlags, /* domainSetMemoryFlags */
qemuDomainSetMemoryParameters, /* domainSetMemoryParameters */
qemuDomainGetMemoryParameters, /* domainGetMemoryParameters */
NULL, /* domainSetBlkioParameters */
NULL, /* domainGetBlkioParameters */
qemuDomainSetBlkioParameters, /* domainSetBlkioParameters */
qemuDomainGetBlkioParameters, /* domainGetBlkioParameters */
qemudDomainGetInfo, /* domainGetInfo */
qemudDomainSave, /* domainSave */
qemudDomainRestore, /* domainRestore */