[libvirt] [PATCHv6 17/18] qemu: Report cache occupancy (CMT) with domstats
Wang Huaqiang
huaqiang.wang at intel.com
Mon Oct 22 07:00:03 UTC 2018
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 at intel.com>
---
src/libvirt-domain.c | 9 ++
src/libvirt_private.syms | 1 +
src/qemu/qemu_driver.c | 229 +++++++++++++++++++++++++++++++++++++++++++++++
src/util/virresctrl.c | 130 +++++++++++++++++++++++++++
src/util/virresctrl.h | 12 +++
5 files changed, 381 insertions(+)
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 7690339..4895f9f 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11345,6 +11345,15 @@ 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" - tocal cache monitoring groups
+ * "cpu.cache.monitor.M.name" - name of cache monitoring group 'M'
+ * "cpu.cache.monitor.M.vcpus" - vcpus for cache monitoring group 'M'
+ * "cpu.cache.monitor.M.bank.count" - total bank number of cache monitoring
+ * group 'M'
+ * "cpu.cache.monitor.M.bank.N.id" - OS assigned cache bank id for cache
+ * 'N' in cache monitoring group 'M'
+ * "cpu.cache.monitor.M.bank.N.bytes" - monitor's cache occupancy of cache
+ * bank 'N' in cache monitoring group 'M'
*
* VIR_DOMAIN_STATS_BALLOON:
* Return memory balloon device information.
diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
index cbc86ce..64ff1d0 100644
--- a/src/libvirt_private.syms
+++ b/src/libvirt_private.syms
@@ -2683,6 +2683,7 @@ virResctrlInfoNew;
virResctrlMonitorAddPID;
virResctrlMonitorCreate;
virResctrlMonitorDeterminePath;
+virResctrlMonitorGetCacheOccupancy;
virResctrlMonitorGetID;
virResctrlMonitorIsRunning;
virResctrlMonitorNew;
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 12a5f8f..9828118 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -102,6 +102,7 @@
#include "virnuma.h"
#include "dirname.h"
#include "netdev_bandwidth_conf.h"
+#include "c-ctype.h"
#define VIR_FROM_THIS VIR_FROM_QEMU
@@ -19698,6 +19699,230 @@ typedef enum {
#define HAVE_JOB(flags) ((flags) & QEMU_DOMAIN_STATS_HAVE_JOB)
+/* In terms of the output of virBitmapFormat, both '1-3' and '1,3' are valid
+ * outputs and represent different vcpu set. But it is not easy to
+ * differentiate these two vcpu set formats at first glance.
+ *
+ * This function could be used to clear this ambiguity, it substitutes all '-'
+ * with ',' while generates semantically correct vcpu set.
+ * e.g. vcpu set string '1-3' will be replaced by string '1,2,3'. */
+static char *
+qemuDomainVcpuFormatHelper(const char *vcpus)
+{
+ size_t i = 0;
+ int last = 0;
+ int start = 0;
+ char * tmp = NULL;
+ bool firstnum = true;
+ const char *cur = vcpus;
+ virBuffer buf = VIR_BUFFER_INITIALIZER;
+ char *ret = NULL;
+
+ if (virStringIsEmpty(cur))
+ return NULL;
+
+ while (*cur != '\0') {
+ if (!c_isdigit(*cur))
+ goto cleanup;
+
+ if (virStrToLong_i(cur, &tmp, 10, &start) < 0)
+ goto cleanup;
+ if (start < 0)
+ goto cleanup;
+
+ cur = tmp;
+
+ virSkipSpaces(&cur);
+
+ if (*cur == ',' || *cur == 0) {
+ if (!firstnum)
+ virBufferAddChar(&buf, ',');
+ virBufferAsprintf(&buf, "%d", start);
+ firstnum = false;
+ } else if (*cur == '-') {
+ cur++;
+ virSkipSpaces(&cur);
+
+ if (virStrToLong_i(cur, &tmp, 10, &last) < 0)
+ goto cleanup;
+
+ if (last < start)
+ goto cleanup;
+ cur = tmp;
+
+ for (i = start; i <= last; i++) {
+ if (!firstnum)
+
+ virBufferAddChar(&buf, ',');
+ virBufferAsprintf(&buf, "%ld", i);
+ firstnum = 0;
+ }
+
+ virSkipSpaces(&cur);
+ }
+
+ if (*cur == ',') {
+ cur++;
+ virSkipSpaces(&cur);
+ } else if (*cur == 0) {
+ break;
+ } else {
+ goto cleanup;
+ }
+ }
+
+ ret = virBufferContentAndReset(&buf);
+ cleanup:
+ virBufferFreeAndReset(&buf);
+ return ret;
+}
+
+
+static int
+qemuDomainGetStatsCpuResource(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
+ virDomainObjPtr dom,
+ virDomainStatsRecordPtr record,
+ int *maxparams,
+ unsigned int privflags ATTRIBUTE_UNUSED,
+ virResctrlMonitorType restag)
+{
+ char param_name[VIR_TYPED_PARAM_FIELD_LENGTH];
+ virDomainResctrlMonDefPtr domresmon = NULL;
+ virResctrlMonitorStatsPtr stats = NULL;
+ size_t nstats = 0;
+ virDomainResctrlDefPtr resctrl = NULL;
+ unsigned int nmonitors = 0;
+ unsigned int imonitor = 0;
+ const char *restype = NULL;
+ char *rawvcpus = NULL;
+ char *vcpus = NULL;
+ size_t i = 0;
+ size_t j = 0;
+ int ret = -1;
+
+ if (!virDomainObjIsActive(dom))
+ return 0;
+
+ if (restag == VIR_RESCTRL_MONITOR_TYPE_CACHE) {
+ restype = "cache";
+ } else {
+ VIR_DEBUG("Invalid CPU resource type");
+ return -1;
+ }
+
+ for (i = 0; i < dom->def->nresctrls; i++) {
+ resctrl = dom->def->resctrls[i];
+
+ for (j = 0; j < resctrl->nmonitors; j++) {
+ domresmon = resctrl->monitors[j];
+ if (virResctrlMonitorIsRunning(domresmon->instance) &&
+ domresmon->tag == restag)
+ nmonitors++;
+ }
+ }
+
+ if (nmonitors) {
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.%s.monitor.count", restype);
+ if (virTypedParamsAddUInt(&record->params,
+ &record->nparams,
+ maxparams,
+ param_name,
+ nmonitors) < 0)
+ goto cleanup;
+ }
+
+ for (i = 0; i < dom->def->nresctrls; i++) {
+ resctrl = dom->def->resctrls[i];
+
+ for (j = 0; j < resctrl->nmonitors; j++) {
+ size_t l = 0;
+ virResctrlMonitorPtr monitor = resctrl->monitors[j]->instance;
+ const char *id = virResctrlMonitorGetID(monitor);
+
+ if (!id)
+ goto cleanup;
+
+ domresmon = resctrl->monitors[j];
+
+ if (!virResctrlMonitorIsRunning(domresmon->instance))
+ continue;
+
+ if (!(rawvcpus = virBitmapFormat(domresmon->vcpus)))
+ goto cleanup;
+
+ vcpus = qemuDomainVcpuFormatHelper(rawvcpus);
+ if (!vcpus)
+ goto cleanup;
+
+ if (virResctrlMonitorGetCacheOccupancy(monitor, &stats,
+ &nstats) < 0)
+ goto cleanup;
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.%s.monitor.%d.name", restype, imonitor);
+ if (virTypedParamsAddString(&record->params,
+ &record->nparams,
+ maxparams,
+ param_name,
+ id) < 0)
+ goto cleanup;
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.%s.monitor.%d.vcpus", restype, imonitor);
+
+ if (virTypedParamsAddString(&record->params,
+ &record->nparams,
+ maxparams,
+ param_name,
+ vcpus) < 0)
+ goto cleanup;
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.%s.monitor.%d.bank.count", restype, imonitor);
+ if (virTypedParamsAddUInt(&record->params,
+ &record->nparams,
+ maxparams,
+ param_name,
+ nstats) < 0)
+ goto cleanup;
+
+ for (l = 0; l < nstats; l++) {
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.%s.monitor.%d.bank.%ld.id",
+ restype, imonitor, l);
+ if (virTypedParamsAddUInt(&record->params,
+ &record->nparams,
+ maxparams,
+ param_name,
+ stats[l].id) < 0)
+ goto cleanup;
+
+
+ snprintf(param_name, VIR_TYPED_PARAM_FIELD_LENGTH,
+ "cpu.%s.monitor.%d.bank.%ld.bytes",
+ restype, imonitor, l);
+ if (virTypedParamsAddUInt(&record->params,
+ &record->nparams,
+ maxparams,
+ param_name,
+ stats[l].val) < 0)
+ goto cleanup;
+ }
+
+ VIR_FREE(stats);
+ VIR_FREE(vcpus);
+ imonitor++;
+ }
+ }
+
+ ret = 0;
+ cleanup:
+ VIR_FREE(vcpus);
+ return ret;
+}
+
+
static int
qemuDomainGetStatsCpu(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
virDomainObjPtr dom,
@@ -19735,6 +19960,10 @@ qemuDomainGetStatsCpu(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
return -1;
}
+ if (qemuDomainGetStatsCpuResource(driver, dom, record, maxparams, privflags,
+ VIR_RESCTRL_MONITOR_TYPE_CACHE) < 0)
+ return -1;
+
return 0;
}
diff --git a/src/util/virresctrl.c b/src/util/virresctrl.c
index fa4c05e..5cccb1c 100644
--- a/src/util/virresctrl.c
+++ b/src/util/virresctrl.c
@@ -2710,3 +2710,133 @@ virResctrlMonitorIsRunning(virResctrlMonitorPtr monitor)
return ret;
}
+
+
+static int
+virResctrlMonitorStatsSorter(const void *a,
+ const void *b)
+{
+ return ((virResctrlMonitorStatsPtr)a)->id
+ - ((virResctrlMonitorStatsPtr)b)->id;
+}
+
+
+/*
+ * virResctrlMonitorGetStats
+ *
+ * @monitor: The monitor that the statistic data will be retrieved from.
+ * @resource: The name for resource name. 'llc_occupancy' for cache resource.
+ * "mbm_total_bytes" and "mbm_local_bytes" for memory bandwidth resource.
+ * @stats: Array of virResctrlMonitorStatsPtr for holding cache or memory
+ * bandwidth usage data.
+ * @nstats: A size_t pointer to hold the returned array length of @stats
+ *
+ * Get cache or memory bandwidth utilization information.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+static int
+virResctrlMonitorGetStats(virResctrlMonitorPtr monitor,
+ const char *resource,
+ virResctrlMonitorStatsPtr *stats,
+ size_t *nstats)
+{
+ int rv = -1;
+ int ret = -1;
+ DIR *dirp = NULL;
+ char *datapath = NULL;
+ struct dirent *ent = NULL;
+ virResctrlMonitorStatsPtr stat = NULL;
+
+ if (!monitor) {
+ virReportError(VIR_ERR_INTERNAL_ERROR, "%s",
+ _("Invalid resctrl monitor"));
+ return -1;
+ }
+
+ if (virAsprintf(&datapath, "%s/mon_data", monitor->path) < 0)
+ return -1;
+
+ if (virDirOpen(&dirp, datapath) < 0)
+ goto cleanup;
+
+ *nstats = 0;
+ while (virDirRead(dirp, &ent, datapath) > 0) {
+ char *node_id = NULL;
+
+ if (VIR_ALLOC(stat) < 0)
+ goto cleanup;
+
+ /* Looking for directory that contains resource utilization
+ * information file. The directory name is arranged in format
+ * "mon_<node_name>_<node_id>". For example, "mon_L3_00" and
+ * "mon_L3_01" are two target directories for a two nodes system
+ * with resource utilization data file for each node respectively.
+ */
+ if (ent->d_type != DT_DIR)
+ continue;
+
+ /* Looking for directory has a prefix 'mon_L' */
+ if (!(node_id = STRSKIP(ent->d_name, "mon_L")))
+ continue;
+
+ /* Looking for directory has another '_' */
+ node_id = strchr(node_id, '_');
+ if (!node_id)
+ continue;
+
+ /* Skip the character '_' */
+ if (!(node_id = STRSKIP(node_id, "_")))
+ continue;
+
+ /* The node ID number should be here, parsing it. */
+ if (virStrToLong_uip(node_id, NULL, 0, &stat->id) < 0)
+ goto cleanup;
+
+ rv = virFileReadValueUint(&stat->val, "%s/%s/%s", datapath,
+ ent->d_name, resource);
+ if (rv == -2) {
+ virReportError(VIR_ERR_INTERNAL_ERROR,
+ _("File '%s/%s/%s' does not exist."),
+ datapath, ent->d_name, resource);
+ }
+ if (rv < 0)
+ goto cleanup;
+
+ if (VIR_APPEND_ELEMENT(*stats, *nstats, *stat) < 0)
+ goto cleanup;
+ }
+
+ /* Sort in id's ascending order */
+ qsort(*stats, *nstats, sizeof(*stat), virResctrlMonitorStatsSorter);
+
+ ret = 0;
+ cleanup:
+ VIR_FREE(datapath);
+ VIR_FREE(stat);
+ VIR_DIR_CLOSE(dirp);
+ return ret;
+}
+
+
+/*
+ * virResctrlMonitorGetCacheOccupancy
+ *
+ * @monitor: The monitor that the statistic data will be retrieved from.
+ * @caches: Array of virResctrlMonitorStatsPtr for receiving cache occupancy
+ * data. Caller is responsible to free this array.
+ * @ncaches: A size_t pointer to hold the returned array length of @caches
+ *
+ * Get cache or memory bandwidth utilization information.
+ *
+ * Returns 0 on success, -1 on error.
+ */
+
+int
+virResctrlMonitorGetCacheOccupancy(virResctrlMonitorPtr monitor,
+ virResctrlMonitorStatsPtr *caches,
+ size_t *ncaches)
+{
+ return virResctrlMonitorGetStats(monitor, "llc_occupancy",
+ caches, ncaches);
+}
diff --git a/src/util/virresctrl.h b/src/util/virresctrl.h
index 8d8fdc2..004c40e 100644
--- a/src/util/virresctrl.h
+++ b/src/util/virresctrl.h
@@ -191,6 +191,13 @@ virResctrlInfoGetMonitorPrefix(virResctrlInfoPtr resctrl,
typedef struct _virResctrlMonitor virResctrlMonitor;
typedef virResctrlMonitor *virResctrlMonitorPtr;
+typedef struct _virResctrlMonitorStats virResctrlMonitorStats;
+typedef virResctrlMonitorStats *virResctrlMonitorStatsPtr;
+struct _virResctrlMonitorStats {
+ unsigned int id;
+ unsigned int val;
+};
+
virResctrlMonitorPtr
virResctrlMonitorNew(void);
@@ -222,4 +229,9 @@ virResctrlMonitorRemove(virResctrlMonitorPtr monitor);
bool
virResctrlMonitorIsRunning(virResctrlMonitorPtr monitor);
+
+int
+virResctrlMonitorGetCacheOccupancy(virResctrlMonitorPtr monitor,
+ virResctrlMonitorStatsPtr *caches,
+ size_t *ncaches);
#endif /* __VIR_RESCTRL_H__ */
--
2.7.4
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