[libvirt] [PATCHv4 4/8] qemu: bulk stats: implement VCPU group

This patch implements the VIR_DOMAIN_STATS_VCPU group of statistics. To do so, this patch also extracts a helper to gather the VCpu information. Signed-off-by: Francesco Romani <fromani(a)redhat.com&gt; --- include/libvirt/libvirt.h.in | 1 + src/libvirt.c | 12 +++ src/qemu/qemu_driver.c | 200 +++++++++++++++++++++++++++++-------------- 3 files changed, 149 insertions(+), 64 deletions(-) diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in index c005442..00eafc6 100644 --- a/include/libvirt/libvirt.h.in +++ b/include/libvirt/libvirt.h.in @@ -2513,6 +2513,7 @@ typedef enum { VIR_DOMAIN_STATS_STATE = (1 << 0), /* return domain state */ VIR_DOMAIN_STATS_CPU_TOTAL = (1 << 1), /* return domain CPU info */ VIR_DOMAIN_STATS_BALLOON = (1 << 2), /* return domain balloon info */ + VIR_DOMAIN_STATS_VCPU = (1 << 3), /* return domain virtual CPU info */ } virDomainStatsTypes; typedef enum { diff --git a/src/libvirt.c b/src/libvirt.c index 3fa86ab..ba7a780 100644 --- a/src/libvirt.c +++ b/src/libvirt.c @@ -21576,6 +21576,18 @@ virConnectGetDomainCapabilities(virConnectPtr conn, * "balloon.maximum" - the maximum memory in kiB allowed * as unsigned long long. * + * VIR_DOMAIN_STATS_VCPU: Return virtual CPU statistics. + * Due to VCPU hotplug, the vcpu.<num>.* array could be sparse. + * The actual size of the array correspond to "vcpu.current". + * The array size will never exceed "vcpu.maximum". + * The typed parameter keys are in this format: + * "vcpu.current" - current number of online virtual CPUs as unsigned int. + * "vcpu.maximum" - maximum number of online virtual CPUs as unsigned int. + * "vcpu.<num>.state" - state of the virtual CPU <num>, as int + * from virVcpuState enum. + * "vcpu.<num>.time" - virtual cpu time spent by virtual CPU <num> + * as unsigned long long. + * * Using 0 for @stats returns all stats groups supported by the given * hypervisor. * diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c index f677884..12bf5e4 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -1380,6 +1380,76 @@ qemuGetProcessInfo(unsigned long long *cpuTime, int *lastCpu, long *vm_rss, } +static int +qemuDomainHelperGetVcpus(virDomainObjPtr vm, virVcpuInfoPtr info, int maxinfo, + unsigned char *cpumaps, int maplen) +{ + int maxcpu, hostcpus; + size_t i, v; + qemuDomainObjPrivatePtr priv = vm->privateData; + + if ((hostcpus = nodeGetCPUCount()) < 0) + return -1; + + maxcpu = maplen * 8; + if (maxcpu > hostcpus) + maxcpu = hostcpus; + + /* Clamp to actual number of vcpus */ + if (maxinfo > priv->nvcpupids) + maxinfo = priv->nvcpupids; + + if (maxinfo >= 1) { + if (info != NULL) { + memset(info, 0, sizeof(*info) * maxinfo); + for (i = 0; i < maxinfo; i++) { + info[i].number = i; + info[i].state = VIR_VCPU_RUNNING; + + if (priv->vcpupids != NULL && + qemuGetProcessInfo(&(info[i].cpuTime), + &(info[i].cpu), + NULL, + vm->pid, + priv->vcpupids[i]) < 0) { + virReportSystemError(errno, "%s", + _("cannot get vCPU placement & pCPU time")); + return -1; + } + } + } + + if (cpumaps != NULL) { + memset(cpumaps, 0, maplen * maxinfo); + if (priv->vcpupids != NULL) { + for (v = 0; v < maxinfo; v++) { + unsigned char *cpumap = VIR_GET_CPUMAP(cpumaps, maplen, v); + virBitmapPtr map = NULL; + unsigned char *tmpmap = NULL; + int tmpmapLen = 0; + + if (virProcessGetAffinity(priv->vcpupids[v], + &map, maxcpu) < 0) + return -1; + virBitmapToData(map, &tmpmap, &tmpmapLen); + if (tmpmapLen > maplen) + tmpmapLen = maplen; + memcpy(cpumap, tmpmap, tmpmapLen); + + VIR_FREE(tmpmap); + virBitmapFree(map); + } + } else { + virReportError(VIR_ERR_OPERATION_INVALID, + "%s", _("cpu affinity is not available")); + return -1; + } + } + } + return maxinfo; +} + + static virDomainPtr qemuDomainLookupByID(virConnectPtr conn, int id) { @@ -5001,10 +5071,7 @@ qemuDomainGetVcpus(virDomainPtr dom, int maplen) { virDomainObjPtr vm; - size_t i; - int v, maxcpu, hostcpus; int ret = -1; - qemuDomainObjPrivatePtr priv; if (!(vm = qemuDomObjFromDomain(dom))) goto cleanup; @@ -5019,67 +5086,7 @@ qemuDomainGetVcpus(virDomainPtr dom, goto cleanup; } - priv = vm->privateData; - - if ((hostcpus = nodeGetCPUCount()) < 0) - goto cleanup; - - maxcpu = maplen * 8; - if (maxcpu > hostcpus) - maxcpu = hostcpus; - - /* Clamp to actual number of vcpus */ - if (maxinfo > priv->nvcpupids) - maxinfo = priv->nvcpupids; - - if (maxinfo >= 1) { - if (info != NULL) { - memset(info, 0, sizeof(*info) * maxinfo); - for (i = 0; i < maxinfo; i++) { - info[i].number = i; - info[i].state = VIR_VCPU_RUNNING; - - if (priv->vcpupids != NULL && - qemuGetProcessInfo(&(info[i].cpuTime), - &(info[i].cpu), - NULL, - vm->pid, - priv->vcpupids[i]) < 0) { - virReportSystemError(errno, "%s", - _("cannot get vCPU placement & pCPU time")); - goto cleanup; - } - } - } - - if (cpumaps != NULL) { - memset(cpumaps, 0, maplen * maxinfo); - if (priv->vcpupids != NULL) { - for (v = 0; v < maxinfo; v++) { - unsigned char *cpumap = VIR_GET_CPUMAP(cpumaps, maplen, v); - virBitmapPtr map = NULL; - unsigned char *tmpmap = NULL; - int tmpmapLen = 0; - - if (virProcessGetAffinity(priv->vcpupids[v], - &map, maxcpu) < 0) - goto cleanup; - virBitmapToData(map, &tmpmap, &tmpmapLen); - if (tmpmapLen > maplen) - tmpmapLen = maplen; - memcpy(cpumap, tmpmap, tmpmapLen); - - VIR_FREE(tmpmap); - virBitmapFree(map); - } - } else { - virReportError(VIR_ERR_OPERATION_INVALID, - "%s", _("cpu affinity is not available")); - goto cleanup; - } - } - } - ret = maxinfo; + ret = qemuDomainHelperGetVcpus(vm, info, maxinfo, cpumaps, maplen); cleanup: if (vm) @@ -17388,6 +17395,70 @@ qemuDomainGetStatsBalloon(virQEMUDriverPtr driver, return 0; } + +static int +qemuDomainGetStatsVcpu(virQEMUDriverPtr driver ATTRIBUTE_UNUSED, + virDomainObjPtr dom, + virDomainStatsRecordPtr record, + int *maxparams, + unsigned int privflags ATTRIBUTE_UNUSED) +{ + size_t i; + int ret = -1; + char param_name[VIR_TYPED_PARAM_FIELD_LENGTH]; + virVcpuInfoPtr cpuinfo = NULL; + + if (virTypedParamsAddUInt(&record->params, + &record->nparams, + maxparams, + "vcpu.current", + (unsigned) dom->def->vcpus) < 0) + return -1; + + if (virTypedParamsAddUInt(&record->params, + &record->nparams, + maxparams, + "vcpu.maximum", + (unsigned) dom->def->maxvcpus) < 0) + return -1; + + if (VIR_ALLOC_N(cpuinfo, dom->def->vcpus) < 0) + return -1; + + if (qemuDomainHelperGetVcpus(dom, cpuinfo, dom->def->vcpus, + NULL, 0) < 0) { + ret = 0; /* it's ok to be silent and go ahead */ + goto cleanup; + } + + for (i = 0; i < dom->def->vcpus; i++) { + snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH, + "vcpu.%u.state", cpuinfo[i].number); + if (virTypedParamsAddInt(&record->params, + &record->nparams, + maxparams, + param_name, + cpuinfo[i].state) < 0) + goto cleanup; + + snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH, + "vcpu.%u.time", cpuinfo[i].number); + if (virTypedParamsAddULLong(&record->params, + &record->nparams, + maxparams, + param_name, + cpuinfo[i].cpuTime) < 0) + goto cleanup; + } + + ret = 0; + + cleanup: + VIR_FREE(cpuinfo); + return ret; +} + + typedef int (*qemuDomainGetStatsFunc)(virQEMUDriverPtr driver, virDomainObjPtr dom, @@ -17405,6 +17476,7 @@ static struct qemuDomainGetStatsWorker qemuDomainGetStatsWorkers[] = { { qemuDomainGetStatsState, VIR_DOMAIN_STATS_STATE, false }, { qemuDomainGetStatsCpu, VIR_DOMAIN_STATS_CPU_TOTAL, false }, { qemuDomainGetStatsBalloon, VIR_DOMAIN_STATS_BALLOON, true }, + { qemuDomainGetStatsVcpu, VIR_DOMAIN_STATS_VCPU, false }, { NULL, 0, false } }; -- 1.9.3