[libvirt] [PATCH 2/2] add interface for blkio.weight_device

This patch adds a parameter --weight-device to virsh command blkiotune for setting/getting blkio.weight_device. --- include/libvirt/libvirt.h.in | 9 ++ src/conf/domain_conf.c | 133 ++++++++++++++++++++++++++++++++- src/conf/domain_conf.h | 15 ++++ src/libvirt_private.syms | 1 + src/qemu/qemu_cgroup.c | 22 ++++++ src/qemu/qemu_driver.c | 171 +++++++++++++++++++++++++++++++++++++++++- src/util/cgroup.c | 33 ++++++++ src/util/cgroup.h | 3 + tools/virsh.c | 31 ++++++++ tools/virsh.pod | 5 +- 10 files changed, 417 insertions(+), 6 deletions(-) diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in index da2080e..5d5bc8d 100644 --- a/include/libvirt/libvirt.h.in +++ b/include/libvirt/libvirt.h.in @@ -1042,6 +1042,15 @@ char * virDomainGetSchedulerType(virDomainPtr domain, #define VIR_DOMAIN_BLKIO_WEIGHT "weight" +/** + * VIR_DOMAIN_BLKIO_WEIGHT_DEVICE: + * + * Macro for the blkio tunable weight_device: it represents the + * per device weight. + */ + +#define VIR_DOMAIN_BLKIO_WEIGHT_DEVICE "weight_device" + /* Set Blkio tunables for the domain*/ int virDomainSetBlkioParameters(virDomainPtr domain, virTypedParameterPtr params, diff --git a/src/conf/domain_conf.c b/src/conf/domain_conf.c index 44212cf..d972a1b 100644 --- a/src/conf/domain_conf.c +++ b/src/conf/domain_conf.c @@ -520,6 +520,101 @@ VIR_ENUM_IMPL(virDomainNumatuneMemMode, VIR_DOMAIN_NUMATUNE_MEM_LAST, #define VIR_DOMAIN_XML_WRITE_FLAGS VIR_DOMAIN_XML_SECURE #define VIR_DOMAIN_XML_READ_FLAGS VIR_DOMAIN_XML_INACTIVE +/** + * virBlkioWeightDeviceToStr: + * + * This function returns a string representing device weights that is + * suitable for writing to /cgroup/blkio/blkio.weight_device, given + * a list of weight devices. + */ +int virBlkioWeightDeviceToStr(virBlkioWeightDevicePtr weightdevices, + int ndevices, + char **result) +{ + int len = 0; + int ret = -1; + int i, j; + char **weight_devices; + char *str; + + if (VIR_ALLOC_N(weight_devices, ndevices) < 0) { + goto fail_nomem1; + } + for (i = 0; i < ndevices; i++) { + int tmp; + tmp = virAsprintf(&weight_devices[i], "%d:%d %d", + weightdevices[i].major, + weightdevices[i].minor, + weightdevices[i].weight); + if (tmp < 0) { + goto fail_nomem2; + } + len += tmp + 1; /* 1 for '\n' and the trailing '\0' */ + } + + if (VIR_ALLOC_N(str, len) < 0) { + goto fail_nomem2; + } + for (i = 0; i < ndevices; i++) { + strcat(str, weight_devices[i]); + strcat(str, "\n"); + } + str[len-1] = '\0'; + + *result = str; + + ret = 0; + +fail_nomem2: + for (j = 0; j < i; j++) + VIR_FREE(weight_devices[i]); + VIR_FREE(weight_devices); +fail_nomem1: + if (ret != 0) + virReportOOMError(); + return ret; +} + +/** + * virDomainBlkioWeightDeviceParseXML + * + * this function parses a XML node: + * + * <device> + * <major>major</major> + * <minor>minor</minor> + * <weight>weight</weight> + * </device> + * + * and fills a virBlkioWeightDevice struct. + */ +static int virDomainBlkioWeightDeviceParseXML(xmlNodePtr root, + virBlkioWeightDevicePtr dw) +{ + xmlNodePtr node; + + if (!dw) + return -1; + + node = root->children; + while (node) { + if (node->type == XML_ELEMENT_NODE) { + if (xmlStrEqual(node->name, BAD_CAST "major")) { + dw->major = atoi((const char *)xmlNodeGetContent(node)); + } else if (xmlStrEqual(node->name, BAD_CAST "minor")) { + dw->minor = atoi((const char *)xmlNodeGetContent(node)); + } else if (xmlStrEqual(node->name, BAD_CAST "weight")) { + dw->weight = atoi((const char *)xmlNodeGetContent(node)); + } + } + node = node->next; + } + + return 0; +} + + + static void virDomainObjListDataFree(void *payload, const void *name ATTRIBUTE_UNUSED) { @@ -6070,6 +6165,20 @@ static virDomainDefPtr virDomainDefParseXML(virCapsPtr caps, &def->blkio.weight) < 0) def->blkio.weight = 0; + n = virXPathNodeSet("./blkiotune/device", ctxt, &nodes); + if (n > 0) { + if (VIR_ALLOC_N(def->blkio.weight_devices, n) < 0) { + virReportOOMError(); + goto error; + } + + for (i = 0; i < n; i++) { + virDomainBlkioWeightDeviceParseXML(nodes[i], &def->blkio.weight_devices[i]); + } + def->blkio.ndevices = n; + VIR_FREE(nodes); + } + /* Extract other memory tunables */ if (virXPathULong("string(./memtune/hard_limit)", ctxt, &def->mem.hard_limit) < 0) @@ -9948,10 +10057,28 @@ virDomainDefFormatInternal(virDomainDefPtr def, def->mem.cur_balloon); /* add blkiotune only if there are any */ - if (def->blkio.weight) { + if (def->blkio.weight || def->blkio.weight_devices) { virBufferAsprintf(&buf, " <blkiotune>\n"); - virBufferAsprintf(&buf, " <weight>%u</weight>\n", - def->blkio.weight); + + if (def->blkio.weight) + virBufferAsprintf(&buf, " <weight>%u</weight>\n", + def->blkio.weight); + + if (def->blkio.weight_devices) { + int i; + + for (i = 0; i < def->blkio.ndevices; i++) { + virBufferAsprintf(&buf, " <device>\n"); + virBufferAsprintf(&buf, " <major>%d</major>\n", + def->blkio.weight_devices[i].major); + virBufferAsprintf(&buf, " <minor>%d</minor>\n", + def->blkio.weight_devices[i].minor); + virBufferAsprintf(&buf, " <weight>%d</weight>\n", + def->blkio.weight_devices[i].weight); + virBufferAsprintf(&buf, " </device>\n"); + } + } + virBufferAsprintf(&buf, " </blkiotune>\n"); } diff --git a/src/conf/domain_conf.h b/src/conf/domain_conf.h index 8382d28..e142649 100644 --- a/src/conf/domain_conf.h +++ b/src/conf/domain_conf.h @@ -1174,6 +1174,19 @@ struct _virDomainNumatuneDef { /* Future NUMA tuning related stuff should go here. */ }; +typedef struct _virBlkioWeightDevice virBlkioWeightDevice; +typedef virBlkioWeightDevice *virBlkioWeightDevicePtr; +struct _virBlkioWeightDevice { + int major; + int minor; + int weight; +}; + +int virBlkioWeightDeviceToStr(virBlkioWeightDevicePtr deviceWeights, + int ndevices, + char **result); + + /* * Guest VM main configuration * @@ -1191,6 +1204,8 @@ struct _virDomainDef { struct { unsigned int weight; + int ndevices; + virBlkioWeightDevicePtr weight_devices; } blkio; struct { diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms index 2a453bc..6dd2593 100644 --- a/src/libvirt_private.syms +++ b/src/libvirt_private.syms @@ -226,6 +226,7 @@ virDomainAuditVcpu; # domain_conf.h +virBlkioWeightDeviceToStr; virDiskNameToBusDeviceIndex; virDiskNameToIndex; virDomainActualNetDefFree; diff --git a/src/qemu/qemu_cgroup.c b/src/qemu/qemu_cgroup.c index 2a10bd2..eb06871 100644 --- a/src/qemu/qemu_cgroup.c +++ b/src/qemu/qemu_cgroup.c @@ -312,6 +312,28 @@ int qemuSetupCgroup(struct qemud_driver *driver, } } + if (qemuCgroupControllerActive(driver, VIR_CGROUP_CONTROLLER_BLKIO)) { + for (i = 0; i < vm->def->blkio.ndevices; i++) { + char *tmp = NULL; + + virAsprintf(&tmp, "%d:%d %d", + vm->def->blkio.weight_devices[i].major, + vm->def->blkio.weight_devices[i].minor, + vm->def->blkio.weight_devices[i].weight); + if (tmp) { + rc = virCgroupSetBlkioWeightDevice(cgroup, tmp); + VIR_FREE(tmp); + tmp = NULL; + if (rc != 0) { + virReportSystemError(-rc, + _("Unable to set io device weight for domain %s"), + vm->def->name); + goto cleanup; + } + } + } + } + if (vm->def->mem.hard_limit != 0 || vm->def->mem.soft_limit != 0 || vm->def->mem.swap_hard_limit != 0) { diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index f21122d..23d96e0 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -44,6 +44,7 @@ #include <sys/ioctl.h> #include <sys/un.h> #include <byteswap.h> +#include <ctype.h> #include "qemu_driver.h" @@ -111,7 +112,7 @@ # define KVM_CAP_NR_VCPUS 9 /* returns max vcpus per vm */ #endif -#define QEMU_NB_BLKIO_PARAM 1 +#define QEMU_NB_BLKIO_PARAM 2 static void processWatchdogEvent(void *data, void *opaque); @@ -5601,6 +5602,86 @@ cleanup: return ret; } +/* weightDeviceStr in the form of major:minor,weight;nmajor:minor,weight + * for example, 8:0,300;8:16,800;8:32,1000 + */ +static int parseBlkioWeightDeviceStr(const char *weightDeviceStr, virBlkioWeightDevicePtr *dw, int *size) +{ + const char *temp; + int nDevice = 0; + int i; + virBlkioWeightDevicePtr result = NULL; + + if (!dw) + return -1; + if (*dw) + return -1; + + temp = weightDeviceStr; + while (temp) { + temp = strchr(temp, ';'); + if (temp) { + temp++; + if (*temp == '\0') + break; + nDevice++; + } + } + nDevice++; + + if (VIR_ALLOC_N(result, nDevice) < 0) { + virReportOOMError(); + return -1; + } + + i = 0; + temp = weightDeviceStr; + while (temp && i < nDevice) { + const char *p = temp; + while (isdigit(*p) && ++p); + if (!p || *p != ':') + goto fail; + + result[i].major = atoi(temp); + + temp = p + 1; + if (!temp) + goto fail; + + p = temp; + while (isdigit(*p) && ++p); + if (!p || *p != ',') + goto fail; + + result[i].minor = atoi(temp); + + temp = p + 1; + if (!temp) + goto fail; + + p = temp; + while (isdigit(*p) && ++p); + if (!p || (*p != ';' && *p != '\0')) + goto fail; + + result[i].weight = atoi(temp); + + i++; + if (*p == '\0') + break; + temp = p + 1; + } + + *dw = result; + *size = i; + + return 0; + +fail: + VIR_FREE(result); + return -1; +} + static int qemuDomainSetBlkioParameters(virDomainPtr dom, virTypedParameterPtr params, int nparams, @@ -5667,10 +5748,10 @@ static int qemuDomainSetBlkioParameters(virDomainPtr dom, ret = 0; if (flags & VIR_DOMAIN_AFFECT_LIVE) { for (i = 0; i < nparams; i++) { + int rc; virTypedParameterPtr param = &params[i]; if (STREQ(param->field, VIR_DOMAIN_BLKIO_WEIGHT)) { - int rc; if (param->type != VIR_TYPED_PARAM_UINT) { qemuReportError(VIR_ERR_INVALID_ARG, "%s", _("invalid type for blkio weight tunable, expected a 'unsigned int'")); @@ -5691,6 +5772,43 @@ static int qemuDomainSetBlkioParameters(virDomainPtr dom, _("unable to set blkio weight tunable")); ret = -1; } + } else if(STREQ(param->field, VIR_DOMAIN_BLKIO_WEIGHT_DEVICE)) { + int ndevices; + virBlkioWeightDevicePtr tmp = NULL; + if (param->type != VIR_TYPED_PARAM_STRING) { + qemuReportError(VIR_ERR_INVALID_ARG, "%s", + _("invalid type for blkio weight_device tunable, expected a 'char *'")); + ret = -1; + continue; + } + + if (parseBlkioWeightDeviceStr(params[i].value.s, + &tmp, + &ndevices) < 0) { + qemuReportError(VIR_ERR_INVALID_ARG, "%s", + _("invalid format for blkio weight_device")); + ret = -1; + continue; + } + for (i = 0; i < ndevices; i++) { + char *weight_device = NULL; + + virAsprintf(&weight_device, "%d:%d %d", + tmp[i].major, + tmp[i].minor, + tmp[i].weight); + if (weight_device) { + rc = virCgroupSetBlkioWeightDevice(group, weight_device); + VIR_FREE(weight_device); + weight_device = NULL; + if (rc != 0) { + virReportSystemError(-rc, "%s", + _("unable to set blkio weight_device tunable")); + ret = -1; + break; + } + } + } } else { qemuReportError(VIR_ERR_INVALID_ARG, _("Parameter `%s' not supported"), param->field); @@ -5720,6 +5838,21 @@ static int qemuDomainSetBlkioParameters(virDomainPtr dom, } persistentDef->blkio.weight = params[i].value.ui; + } else if (STREQ(param->field, VIR_DOMAIN_BLKIO_WEIGHT_DEVICE)) { + virBlkioWeightDevicePtr tmp = NULL; + int ndevices; + if (parseBlkioWeightDeviceStr(params[i].value.s, + &tmp, + &ndevices) < 0) { + qemuReportError(VIR_ERR_INVALID_ARG, + _("invalid device weight format: %s"), + params[i].value.s); + ret = -1; + continue; + } + VIR_FREE(persistentDef->blkio.weight_devices); + persistentDef->blkio.weight_devices = tmp; + persistentDef->blkio.ndevices = ndevices; } else { qemuReportError(VIR_ERR_INVALID_ARG, _("Parameter `%s' not supported"), param->field); @@ -5746,6 +5879,7 @@ static int qemuDomainGetBlkioParameters(virDomainPtr dom, { struct qemud_driver *driver = dom->conn->privateData; int i; + char *weight_device; virCgroupPtr group = NULL; virDomainObjPtr vm = NULL; virDomainDefPtr persistentDef = NULL; @@ -5839,6 +5973,23 @@ static int qemuDomainGetBlkioParameters(virDomainPtr dom, } param->value.ui = val; break; + case 1: /* blkio.weight_device */ + { + param->type = VIR_TYPED_PARAM_STRING; + rc = virCgroupGetBlkioWeightDevice(group, &weight_device); + if (rc != 0) { + virReportSystemError(-rc, "%s", + _("unable to get blkio weight_device")); + goto cleanup; + } + if (virStrcpyStatic(param->field, VIR_DOMAIN_BLKIO_WEIGHT_DEVICE) == NULL) { + qemuReportError(VIR_ERR_INTERNAL_ERROR, + "%s", _("Field blkio weight_device too long for destination")); + goto cleanup; + } + param->value.s = weight_device; + break; + } default: break; @@ -5862,6 +6013,22 @@ static int qemuDomainGetBlkioParameters(virDomainPtr dom, param->value.ui = persistentDef->blkio.weight; break; + case 1: /* blkio.weight_device */ + { + if (virBlkioWeightDeviceToStr(persistentDef->blkio.weight_devices, + persistentDef->blkio.ndevices, + &param->value.s) < 0) + goto cleanup; + param->type = VIR_TYPED_PARAM_STRING; + if (virStrcpyStatic(param->field, VIR_DOMAIN_BLKIO_WEIGHT_DEVICE) == NULL) { + qemuReportError(VIR_ERR_INTERNAL_ERROR, + "%s", _("Field blkio weight_device too long for destination")); + goto cleanup; + } + + break; + } + default: break; /* should not hit here */ diff --git a/src/util/cgroup.c b/src/util/cgroup.c index f3ec80f..e29c964 100644 --- a/src/util/cgroup.c +++ b/src/util/cgroup.c @@ -977,6 +977,39 @@ int virCgroupGetBlkioWeight(virCgroupPtr group, unsigned int *weight) } /** + * virCgroupSetBlkioWeightDevice: + * + * @group: The cgroup to change io weight device for + * @weight_device: The Weight device for this cgroup + * + * Returns: 0 on success + */ +int virCgroupSetBlkioWeightDevice(virCgroupPtr group, + const char *weight_device) +{ + return virCgroupSetValueStr(group, + VIR_CGROUP_CONTROLLER_BLKIO, + "blkio.weight_device", + weight_device); +} + +/** + * virCgroupGetBlkioWeightDevice: + * + * @group: The cgroup to get weight_device for + * @weight_device: returned weight_device string + * + * Returns: 0 on success + */ +int virCgroupGetBlkioWeightDevice(virCgroupPtr group, + char **weight_device) +{ + return virCgroupGetValueStr(group, + VIR_CGROUP_CONTROLLER_BLKIO, + "blkio.weight_device", weight_device); +} + +/** * virCgroupSetMemory: * * @group: The cgroup to change memory for diff --git a/src/util/cgroup.h b/src/util/cgroup.h index d190bb3..87e196b 100644 --- a/src/util/cgroup.h +++ b/src/util/cgroup.h @@ -55,6 +55,9 @@ int virCgroupAddTask(virCgroupPtr group, pid_t pid); int virCgroupSetBlkioWeight(virCgroupPtr group, unsigned int weight); int virCgroupGetBlkioWeight(virCgroupPtr group, unsigned int *weight); +int virCgroupSetBlkioWeightDevice(virCgroupPtr group, const char *weight_device); +int virCgroupGetBlkioWeightDevice(virCgroupPtr group, char **weight_device); + int virCgroupSetMemory(virCgroupPtr group, unsigned long long kb); int virCgroupGetMemoryUsage(virCgroupPtr group, unsigned long *kb); diff --git a/tools/virsh.c b/tools/virsh.c index 15b9bdd..3ed8e70 100644 --- a/tools/virsh.c +++ b/tools/virsh.c @@ -3983,6 +3983,8 @@ static const vshCmdOptDef opts_blkiotune[] = { {"domain", VSH_OT_DATA, VSH_OFLAG_REQ, N_("domain name, id or uuid")}, {"weight", VSH_OT_INT, VSH_OFLAG_NONE, N_("IO Weight in range [100, 1000]")}, + {"weight-device", VSH_OT_STRING, VSH_OFLAG_NONE, + N_("per device IO Weight, in the form of major:minor,weight")}, {"config", VSH_OT_BOOL, 0, N_("affect next boot")}, {"live", VSH_OT_BOOL, 0, N_("affect running domain")}, {"current", VSH_OT_BOOL, 0, N_("affect current domain")}, @@ -3993,6 +3995,7 @@ static bool cmdBlkiotune(vshControl * ctl, const vshCmd * cmd) { virDomainPtr dom; + const char *weight_device = NULL; int weight = 0; int nparams = 0; int rv = 0; @@ -4037,6 +4040,16 @@ cmdBlkiotune(vshControl * ctl, const vshCmd * cmd) } } + rv = vshCommandOptString(cmd, "weight-device", &weight_device); + if (rv < 0) { + vshError(ctl, "%s", + _("Unable to parse string parameter")); + goto cleanup; + } + if (rv > 0) { + nparams++; + } + if (nparams == 0) { /* get the number of blkio parameters */ if (virDomainGetBlkioParameters(dom, NULL, &nparams, flags) != 0) { @@ -4084,6 +4097,10 @@ cmdBlkiotune(vshControl * ctl, const vshCmd * cmd) vshPrint(ctl, "%-15s: %d\n", params[i].field, params[i].value.b); break; + case VIR_TYPED_PARAM_STRING: + vshPrint(ctl, "%-15s: %s\n", params[i].field, + params[i].value.s); + break; default: vshPrint(ctl, "unimplemented blkio parameter type\n"); } @@ -4104,6 +4121,20 @@ cmdBlkiotune(vshControl * ctl, const vshCmd * cmd) sizeof(temp->field)); weight = 0; } + + if (weight_device) { + int len = strlen(weight_device) + 1; + temp->type = VIR_TYPED_PARAM_STRING; + temp->value.s = vshMalloc(ctl, len); + if (!temp->value.s) { + goto cleanup; + } + strncpy(temp->value.s, weight_device, strlen(weight_device)); + temp->value.s[len-1] = '\0'; + weight_device = NULL; + strncpy(temp->field, VIR_DOMAIN_BLKIO_WEIGHT_DEVICE, + sizeof(temp->field)); + } } if (virDomainSetBlkioParameters(dom, params, nparams, flags) != 0) vshError(ctl, "%s", _("Unable to change blkio parameters")); diff --git a/tools/virsh.pod b/tools/virsh.pod index 81d7a1e..75bf24e 100644 --- a/tools/virsh.pod +++ b/tools/virsh.pod @@ -835,12 +835,15 @@ value are kilobytes (i.e. blocks of 1024 bytes). =back -=item B<blkiotune> I<domain-id> [I<--weight> B<weight>] [[I<--config>] +=item B<blkiotune> I<domain-id> [I<--weight> B<weight>] +[I<--weight-device> B<weight-device>] [[I<--config>] [I<--live>] | [I<--current>]] Display or set the blkio parameters. QEMU/KVM supports I<--weight>. I<--weight> is in range [100, 1000]. +B<weight-device> is in the format of major:minor,weight;major:minor,weight. + If I<--live> is specified, affect a running guest. If I<--config> is specified, affect the next boot of a persistent guest. If I<--current> is specified, affect the current guest state. -- 1.7.3.1