[libvirt] [PATCH 5/5] Add support for blkio tuning of LXC containers

From: "Daniel P. Berrange" <berrange(a)redhat.com&gt; * src/lxc/lxc_controller.c: Refactor setting of initial blkio tuning parameters * src/lxc/lxc_driver.c: Enable live change of blkio tuning --- src/lxc/lxc_driver.c | 283 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 files changed, 283 insertions(+), 0 deletions(-) diff --git a/src/lxc/lxc_driver.c b/src/lxc/lxc_driver.c index 356a175..0edc703 100644 --- a/src/lxc/lxc_driver.c +++ b/src/lxc/lxc_driver.c @@ -2998,6 +2998,287 @@ lxcGetSchedulerParameters(virDomainPtr domain, return lxcGetSchedulerParametersFlags(domain, params, nparams, 0); } + +static int lxcDomainSetBlkioParameters(virDomainPtr dom, + virTypedParameterPtr params, + int nparams, + unsigned int flags) +{ + lxc_driver_t *driver = dom->conn->privateData; + int i; + virCgroupPtr group = NULL; + virDomainObjPtr vm = NULL; + virDomainDefPtr persistentDef = NULL; + int ret = -1; + bool isActive; + + virCheckFlags(VIR_DOMAIN_AFFECT_LIVE | + VIR_DOMAIN_AFFECT_CONFIG, -1); + lxcDriverLock(driver); + + vm = virDomainFindByUUID(&driver->domains, dom->uuid); + + if (vm == NULL) { + lxcError(VIR_ERR_INTERNAL_ERROR, + _("No such domain %s"), dom->uuid); + goto cleanup; + } + + isActive = virDomainObjIsActive(vm); + + if (flags == VIR_DOMAIN_AFFECT_CURRENT) { + if (isActive) + flags = VIR_DOMAIN_AFFECT_LIVE; + else + flags = VIR_DOMAIN_AFFECT_CONFIG; + } + + if (flags & VIR_DOMAIN_AFFECT_LIVE) { + if (!isActive) { + lxcError(VIR_ERR_OPERATION_INVALID, + "%s", _("domain is not running")); + goto cleanup; + } + + if (!lxcCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) { + lxcError(VIR_ERR_OPERATION_INVALID, _("blkio cgroup isn't mounted")); + goto cleanup; + } + + if (virCgroupForDomain(driver->cgroup, vm->def->name, &group, 0) != 0) { + lxcError(VIR_ERR_INTERNAL_ERROR, + _("cannot find cgroup for domain %s"), vm->def->name); + goto cleanup; + } + } + + if (flags & VIR_DOMAIN_AFFECT_CONFIG) { + if (!vm->persistent) { + lxcError(VIR_ERR_OPERATION_INVALID, "%s", + _("cannot change persistent config of a transient domain")); + goto cleanup; + } + if (!(persistentDef = virDomainObjGetPersistentDef(driver->caps, vm))) + goto cleanup; + } + + ret = 0; + if (flags & VIR_DOMAIN_AFFECT_LIVE) { + for (i = 0; i < nparams; i++) { + virTypedParameterPtr param = &params[i]; + + if (STREQ(param->field, VIR_DOMAIN_BLKIO_WEIGHT)) { + int rc; + if (param->type != VIR_TYPED_PARAM_UINT) { + lxcError(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) { + lxcError(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 { + lxcError(VIR_ERR_INVALID_ARG, + _("Parameter `%s' not supported"), param->field); + ret = -1; + } + } + } else if (flags & VIR_DOMAIN_AFFECT_CONFIG) { + /* Clang can't see that if we get here, persistentDef was set. */ + sa_assert(persistentDef); + + for (i = 0; i < nparams; i++) { + virTypedParameterPtr param = &params[i]; + + if (STREQ(param->field, VIR_DOMAIN_BLKIO_WEIGHT)) { + if (param->type != VIR_TYPED_PARAM_UINT) { + lxcError(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) { + lxcError(VIR_ERR_INVALID_ARG, "%s", + _("out of blkio weight range.")); + ret = -1; + continue; + } + + persistentDef->blkio.weight = params[i].value.ui; + } else { + lxcError(VIR_ERR_INVALID_ARG, + _("Parameter `%s' not supported"), param->field); + ret = -1; + } + } + + if (virDomainSaveConfig(driver->configDir, persistentDef) < 0) + ret = -1; + } + +cleanup: + virCgroupFree(&group); + if (vm) + virDomainObjUnlock(vm); + lxcDriverUnlock(driver); + return ret; +} + + +#define LXC_NB_BLKIO_PARAM 1 +static int lxcDomainGetBlkioParameters(virDomainPtr dom, + virTypedParameterPtr params, + int *nparams, + unsigned int flags) +{ + lxc_driver_t *driver = dom->conn->privateData; + int i; + virCgroupPtr group = NULL; + virDomainObjPtr vm = NULL; + virDomainDefPtr persistentDef = NULL; + unsigned int val; + int ret = -1; + int rc; + bool isActive; + + virCheckFlags(VIR_DOMAIN_AFFECT_LIVE | + VIR_DOMAIN_AFFECT_CONFIG, -1); + lxcDriverLock(driver); + + vm = virDomainFindByUUID(&driver->domains, dom->uuid); + + if (vm == NULL) { + lxcError(VIR_ERR_INTERNAL_ERROR, + _("No such domain %s"), dom->uuid); + goto cleanup; + } + + if ((*nparams) == 0) { + /* Current number of blkio parameters supported by cgroups */ + *nparams = LXC_NB_BLKIO_PARAM; + ret = 0; + goto cleanup; + } + + isActive = virDomainObjIsActive(vm); + + if (flags == VIR_DOMAIN_AFFECT_CURRENT) { + if (isActive) + flags = VIR_DOMAIN_AFFECT_LIVE; + else + flags = VIR_DOMAIN_AFFECT_CONFIG; + } + + if (flags & VIR_DOMAIN_AFFECT_LIVE) { + if (!isActive) { + lxcError(VIR_ERR_OPERATION_INVALID, + "%s", _("domain is not running")); + goto cleanup; + } + + if (!lxcCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) { + lxcError(VIR_ERR_OPERATION_INVALID, _("blkio cgroup isn't mounted")); + goto cleanup; + } + + if (virCgroupForDomain(driver->cgroup, vm->def->name, &group, 0) != 0) { + lxcError(VIR_ERR_INTERNAL_ERROR, + _("cannot find cgroup for domain %s"), vm->def->name); + goto cleanup; + } + } + + if (flags & VIR_DOMAIN_AFFECT_CONFIG) { + if (!vm->persistent) { + lxcError(VIR_ERR_OPERATION_INVALID, "%s", + _("cannot change persistent config of a transient domain")); + goto cleanup; + } + if (!(persistentDef = virDomainObjGetPersistentDef(driver->caps, vm))) + goto cleanup; + } + + if (flags & VIR_DOMAIN_AFFECT_LIVE) { + for (i = 0; i < *nparams && i < LXC_NB_BLKIO_PARAM; i++) { + virTypedParameterPtr param = &params[i]; + val = 0; + param->value.ui = 0; + param->type = VIR_TYPED_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) { + lxcError(VIR_ERR_INTERNAL_ERROR, + _("Field name '%s' too long"), + VIR_DOMAIN_BLKIO_WEIGHT); + goto cleanup; + } + param->value.ui = val; + break; + + default: + break; + /* should not hit here */ + } + } + } else if (flags & VIR_DOMAIN_AFFECT_CONFIG) { + for (i = 0; i < *nparams && i < LXC_NB_BLKIO_PARAM; i++) { + virTypedParameterPtr param = &params[i]; + val = 0; + param->value.ui = 0; + param->type = VIR_TYPED_PARAM_UINT; + + switch (i) { + case 0: /* fill blkio weight here */ + if (virStrcpyStatic(param->field, VIR_DOMAIN_BLKIO_WEIGHT) == NULL) { + lxcError(VIR_ERR_INTERNAL_ERROR, + _("Field name '%s' too long"), + VIR_DOMAIN_BLKIO_WEIGHT); + goto cleanup; + } + param->value.ui = persistentDef->blkio.weight; + break; + + default: + break; + /* should not hit here */ + } + } + } + + if (LXC_NB_BLKIO_PARAM < *nparams) + *nparams = LXC_NB_BLKIO_PARAM; + ret = 0; + +cleanup: + if (group) + virCgroupFree(&group); + if (vm) + virDomainObjUnlock(vm); + lxcDriverUnlock(driver); + return ret; +} + + #ifdef __linux__ static int lxcDomainInterfaceStats(virDomainPtr dom, @@ -3493,6 +3774,8 @@ static virDriver lxcDriver = { .domainSetMemory = lxcDomainSetMemory, /* 0.7.2 */ .domainSetMemoryParameters = lxcDomainSetMemoryParameters, /* 0.8.5 */ .domainGetMemoryParameters = lxcDomainGetMemoryParameters, /* 0.8.5 */ + .domainSetBlkioParameters = lxcDomainSetBlkioParameters, /* 0.9.8 */ + .domainGetBlkioParameters = lxcDomainGetBlkioParameters, /* 0.9.8 */ .domainGetInfo = lxcDomainGetInfo, /* 0.4.2 */ .domainGetState = lxcDomainGetState, /* 0.9.2 */ .domainGetXMLDesc = lxcDomainGetXMLDesc, /* 0.4.2 */ -- 1.7.6.4