[libvirt] [PATCHv6 04/11] qemu: bulk stats: implement VCPU group
Peter Krempa
pkrempa at redhat.com
Mon Sep 15 15:42:48 UTC 2014
From: Francesco Romani <fromani at redhat.com>
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 at redhat.com>
Signed-off-by: Peter Krempa <pkrempa at redhat.com>
---
Notes:
Version 6:
- changed indexing of the returned parameters from the retuned array that
is not filled if the guest is offline to the local index and stopped
returning the CPU time once the guest is offline.
include/libvirt/libvirt.h.in | 1 +
src/libvirt.c | 12 +++
src/qemu/qemu_driver.c | 205 +++++++++++++++++++++++++++++--------------
3 files changed, 154 insertions(+), 64 deletions(-)
diff --git a/include/libvirt/libvirt.h.in b/include/libvirt/libvirt.h.in
index a5033ed..4b851a5 100644
--- a/include/libvirt/libvirt.h.in
+++ b/include/libvirt/libvirt.h.in
@@ -2515,6 +2515,7 @@ 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 b3b71a0..1d91c99 100644
--- a/src/libvirt.c
+++ b/src/libvirt.c
@@ -21609,6 +21609,18 @@ 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 825727d..fd4bcae 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)
{
@@ -4959,10 +5029,7 @@ 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;
@@ -4977,67 +5044,7 @@ 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)
@@ -17468,6 +17475,75 @@ qemuDomainGetStatsBalloon(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
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) {
+ virResetLastError();
+ 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.%zu.state", i);
+ if (virTypedParamsAddInt(&record->params,
+ &record->nparams,
+ maxparams,
+ param_name,
+ cpuinfo[i].state) < 0)
+ goto cleanup;
+
+ /* stats below are available only if the VM is alive */
+ if (!virDomainObjIsActive(dom))
+ continue;
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "vcpu.%zu.time", i);
+ 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,
@@ -17485,6 +17561,7 @@ 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 }
};
--
2.1.0
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