Adding the interface in qemu to report CMT statistic information
through command 'virsh domstats --cpu-total'.
Below is a typical output:
# virsh domstats 1 --cpu-total
Domain: 'ubuntu16.04-base'
...
cpu.cache.monitor.count=2
cpu.cache.monitor.0.name=vcpus_1
cpu.cache.monitor.0.vcpus=1
cpu.cache.monitor.0.bank.count=2
cpu.cache.monitor.0.bank.0.id=0
cpu.cache.monitor.0.bank.0.bytes=4505600
cpu.cache.monitor.0.bank.1.id=1
cpu.cache.monitor.0.bank.1.bytes=5586944
cpu.cache.monitor.1.name=vcpus_4-6
cpu.cache.monitor.1.vcpus=4,5,6
cpu.cache.monitor.1.bank.count=2
cpu.cache.monitor.1.bank.0.id=0
cpu.cache.monitor.1.bank.0.bytes=17571840
cpu.cache.monitor.1.bank.1.id=1
cpu.cache.monitor.1.bank.1.bytes=29106176
Signed-off-by: Wang Huaqiang <huaqiang.wang@xxxxxxxxx>
---
src/libvirt-domain.c | 12 ++++
src/qemu/qemu_driver.c | 183 ++++++++++++++++++++++++++++++++++++++++++++++++-
tools/virsh.pod | 14 ++++
3 files changed, 208 insertions(+), 1 deletion(-)
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 5b76458..73d602e 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11415,6 +11415,18 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "cpu.user" - user cpu time spent in nanoseconds as unsigned long long.
* "cpu.system" - system cpu time spent in nanoseconds as unsigned long
* long.
+ * "cpu.cache.monitor.count" - the number of cache monitors for this domain
+ * "cpu.cache.monitor.<num>.name" - the name of cache monitor <num>
+ * "cpu.cache.monitor.<num>.vcpus" - vcpu list of cache monitor <num>
+ * "cpu.cache.monitor.<num>.bank.count" - the number of cache banks in
+ * cache monitor <num>
+ * "cpu.cache.monitor.<num>.bank.<index>.id" - host allocated cache id for
+ * bank <index> in cache
+ * monitor <num>
+ * "cpu.cache.monitor.<num>.bank.<index>.bytes" - the number of bytes of
+ * last level cache that the
+ * domain is using on cache
+ * bank <index>
*
* VIR_DOMAIN_STATS_BALLOON:
* Return memory balloon device information.
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 7fb9102..ac2be35 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -19929,6 +19929,181 @@ typedef enum {
#define HAVE_JOB(flags) ((flags) & QEMU_DOMAIN_STATS_HAVE_JOB)
+typedef struct _virQEMUResctrlMonData virQEMUResctrlMonData;
+typedef virQEMUResctrlMonData *virQEMUResctrlMonDataPtr;
+struct _virQEMUResctrlMonData {
+ char *name;
+ char *vcpus;
+ virResctrlMonitorStatsPtr *stats;
+ size_t nstats;
+};
+
+
+static void
+qemuDomainFreeResctrlMonData(virQEMUResctrlMonDataPtr *resdata,
+ size_t nresdata)
+{
+ size_t i = 0;
+
+ for (i = 0; i < nresdata; i++) {
+ VIR_FREE(resdata[i]->name);
+ VIR_FREE(resdata[i]->vcpus);
+ virResctrlMonitorFreeStats(resdata[i]->stats, resdata[i]->nstats);
+ VIR_FREE(resdata[i]);
+ }
+
+ VIR_FREE(resdata);
+}
+
+
+/**
+ * qemuDomainGetResctrlMonData:
+ * @dom: Pointer for the domain that the resctrl monitors reside in
+ * @resdata: Pointer of virQEMUResctrlMonDataPtr pointer for receiving the
+ * virQEMUResctrlMonDataPtr array. Caller is responsible for
+ * freeing the array.
+ * @nresdata: Pointer of size_t to report the size virQEMUResctrlMonDataPtr
+ * array to caller. If *@nresdata is not 0, even if function
+ * returns an error, the caller is also required to call
+ * qemuDomainFreeResctrlMonData to free the array in *@resdata
+ * @tag: Could be VIR_RESCTRL_MONITOR_TYPE_CACHE for getting cache statistics
+ * from @dom cache monitors. VIR_RESCTRL_MONITOR_TYPE_MEMBW for
+ * getting memory bandwidth statistics from memory bandwidth monitors.
+ *
+ * Get cache or memory bandwidth statistics from @dom monitors.
+ *
+ * Returns -1 on failure, or 0 on success.
+ */
+static int
+qemuDomainGetResctrlMonData(virDomainObjPtr dom,
+ virQEMUResctrlMonDataPtr **resdata,
+ size_t *nresdata,
+ virResctrlMonitorType tag)
+{
+ virDomainResctrlDefPtr resctrl = NULL;
+ virQEMUResctrlMonDataPtr res = NULL;
+ size_t i = 0;
+ size_t j = 0;
+
+ for (i = 0; i < dom->def->nresctrls; i++) {
+ resctrl = dom->def->resctrls[i];
+
+ for (j = 0; j < resctrl->nmonitors; j++) {
+ virDomainResctrlMonDefPtr domresmon = NULL;
+ virResctrlMonitorPtr monitor = NULL;
+
+ domresmon = resctrl->monitors[j];
+ monitor = domresmon->instance;
+
+ if (domresmon->tag != tag)
+ continue;
+
+ if (VIR_ALLOC(res) < 0)
+ return -1;
+
+ /* If virBitmapFormat successfully returns an vcpu string, then
+ * res.vcpus is assigned with an memory space holding it,
+ * let this newly allocated memory buffer to be freed along with
+ * the free of 'res' */
+ if (!(res->vcpus = virBitmapFormat(domresmon->vcpus)))
+ goto error;
+
+ if (VIR_STRDUP(res->name, virResctrlMonitorGetID(monitor)) < 0)
+ goto error;
+
+ if (virResctrlMonitorGetCacheOccupancy(monitor,
+ &res->stats,
+ &res->nstats) < 0)
+ goto error;
+
+ if (VIR_APPEND_ELEMENT(*resdata, *nresdata, res) < 0)
+ goto error;
+ }
+ }
+
+ return 0;
+
+ error:
+ if (res)
+ qemuDomainFreeResctrlMonData(&res, 1);
+
+ return -1;
+}
+
+
+static int
+qemuDomainGetStatsCpuCache(virDomainObjPtr dom,
+ virDomainStatsRecordPtr record,
+ int *maxparams)
+{
+ char param_name[VIR_TYPED_PARAM_FIELD_LENGTH];
+ virQEMUResctrlMonDataPtr *resdata = NULL;
+ size_t nresdata = 0;
+ size_t i = 0;
+ size_t j = 0;
+ int ret = -1;
+
+ if (!virDomainObjIsActive(dom))
+ return 0;
+
+ if (qemuDomainGetResctrlMonData(dom, &resdata, &nresdata,
+ VIR_RESCTRL_MONITOR_TYPE_CACHE) < 0)
+ goto cleanup;
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.cache.monitor.count");
+ if (virTypedParamsAddUInt(&record->params, &record->nparams,
+ maxparams, param_name, nresdata) < 0)
+ goto cleanup;
+
+ for (i = 0; i < nresdata; i++) {
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.cache.monitor.%zu.name", i);
+ if (virTypedParamsAddString(&record->params,
+ &record->nparams,
+ maxparams,
+ param_name,
+ resdata[i]->name) < 0)
+ goto cleanup;
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.cache.monitor.%zu.vcpus", i);
+ if (virTypedParamsAddString(&record->params, &record->nparams,
+ maxparams, param_name,
+ resdata[i]->vcpus) < 0)
+ goto cleanup;
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.cache.monitor.%zu.bank.count", i);
+ if (virTypedParamsAddUInt(&record->params, &record->nparams,
+ maxparams, param_name,
+ resdata[i]->nstats) < 0)
+ goto cleanup;
+
+ for (j = 0; j < resdata[i]->nstats; j++) {
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.cache.monitor.%zu.bank.%zu.id", i, j);
+ if (virTypedParamsAddUInt(&record->params, &record->nparams,
+ maxparams, param_name,
+ resdata[i]->stats[j]->id) < 0)
+ goto cleanup;
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.cache.monitor.%zu.bank.%zu.bytes", i, j);
+ if (virTypedParamsAddUInt(&record->params, &record->nparams,
+ maxparams, param_name,
+ resdata[i]->stats[j]->val) < 0)
+ goto cleanup;
+ }
+ }
+
+ ret = 0;
+ cleanup:
+ qemuDomainFreeResctrlMonData(resdata, nresdata);
+ return ret;
+}
+
+
static int
qemuDomainGetStatsCpuCgroup(virDomainObjPtr dom,
virDomainStatsRecordPtr record,
@@ -19976,7 +20151,13 @@ qemuDomainGetStatsCpu(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
int *maxparams,
unsigned int privflags ATTRIBUTE_UNUSED)
{
- return qemuDomainGetStatsCpuCgroup(dom, record, maxparams);
+ if (qemuDomainGetStatsCpuCgroup(dom, record, maxparams) < 0)
+ return -1;
+
+ if (qemuDomainGetStatsCpuCache(dom, record, maxparams) < 0)
+ return -1;
+
+ return 0;
}
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 4876656..86a4996 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -1012,6 +1012,20 @@ I<--cpu-total> returns:
"cpu.time" - total cpu time spent for this domain in nanoseconds
"cpu.user" - user cpu time spent in nanoseconds
"cpu.system" - system cpu time spent in nanoseconds
+ "cpu.cache.monitor.count" - the number of cache monitors for this
+ domain
+ "cpu.cache.monitor.<num>.name" - the name of cache monitor <num>
+ "cpu.cache.monitor.<num>.vcpus" - vcpu list of cache monitor <num>
+ "cpu.cache.monitor.<num>.bank.count" - the number of cache banks
+ in cache monitor <num>
+ "cpu.cache.monitor.<num>.bank.<index>.id" - host allocated cache id
+ for bank <index> in
+ cache monitor <num>
+ "cpu.cache.monitor.<num>.bank.<index>.bytes" - the number of bytes
+ of last level cache
+ that the domain is
+ using on cache bank
+ <index>
I<--balloon> returns:
--
2.7.4
--
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