[libvirt] [PATCH] bhyve: implement domainGetCPUStats
Roman Bogorodskiy
bogorodskiy at gmail.com
Tue Apr 22 17:44:47 UTC 2014
For per CPU stats, implement virBhyveGetDomainPercpuStats() that
uses bhyvectl tool to obtain the guest's vcpu stats.
For total CPU stats, add virBhyveGetDomainTotalCpuStats() that
gets the hypervisor process CPU stats using kvm (kernel
memory interface).
---
configure.ac | 7 +++
src/bhyve/bhyve_driver.c | 38 +++++++++++++
src/bhyve/bhyve_process.c | 136 ++++++++++++++++++++++++++++++++++++++++++++++
src/bhyve/bhyve_process.h | 10 ++++
4 files changed, 191 insertions(+)
diff --git a/configure.ac b/configure.ac
index ea85851..dbfada2 100644
--- a/configure.ac
+++ b/configure.ac
@@ -2678,6 +2678,13 @@ AC_CHECK_DECLS([cpuset_getaffinity],
#include <sys/cpuset.h>
])
+# Check for BSD kvm (kernel memory interface)
+if test $with_freebsd = yes; then
+ AC_CHECK_LIB([kvm], [kvm_getprocs], [],
+ [AC_MSG_ERROR([BSD kernel memory interface library is required to build on FreeBSD])]
+ )
+fi
+
# Check if we need to look for ifconfig
if test "$want_ifconfig" = "yes"; then
AC_PATH_PROG([IFCONFIG_PATH], [ifconfig])
diff --git a/src/bhyve/bhyve_driver.c b/src/bhyve/bhyve_driver.c
index 0cafe4c..25b0dce 100644
--- a/src/bhyve/bhyve_driver.c
+++ b/src/bhyve/bhyve_driver.c
@@ -930,6 +930,43 @@ bhyveDomainGetMetadata(virDomainPtr dom,
}
static int
+bhyveDomainGetCPUStats(virDomainPtr dom,
+ virTypedParameterPtr params ATTRIBUTE_UNUSED,
+ unsigned int nparams,
+ int start_cpu,
+ unsigned int ncpus,
+ unsigned int flags)
+{
+ virDomainObjPtr vm = NULL;
+ int ret = -1;
+
+ virCheckFlags(VIR_TYPED_PARAM_STRING_OKAY, -1);
+
+ if (!(vm = bhyveDomObjFromDomain(dom)))
+ return ret;
+
+ if (virDomainGetCPUStatsEnsureACL(dom->conn, vm->def) < 0)
+ goto cleanup;
+
+ if (!virDomainObjIsActive(vm)) {
+ virReportError(VIR_ERR_OPERATION_INVALID, "%s",
+ _("domain is not running"));
+ goto cleanup;
+ }
+
+ if (start_cpu == -1)
+ ret = virBhyveGetDomainTotalCpuStats(vm, params, nparams);
+ else
+ ret = virBhyveGetDomainPercpuStats(vm, params, nparams,
+ start_cpu, ncpus);
+
+ cleanup:
+ if (vm)
+ virObjectUnlock(vm);
+ return ret;
+}
+
+static int
bhyveNodeGetCPUStats(virConnectPtr conn,
int cpuNum,
virNodeCPUStatsPtr params,
@@ -1198,6 +1235,7 @@ static virDriver bhyveDriver = {
.domainOpenConsole = bhyveDomainOpenConsole, /* 1.2.4 */
.domainSetMetadata = bhyveDomainSetMetadata, /* 1.2.4 */
.domainGetMetadata = bhyveDomainGetMetadata, /* 1.2.4 */
+ .domainGetCPUStats = bhyveDomainGetCPUStats, /* 1.2.4 */
.nodeGetCPUStats = bhyveNodeGetCPUStats, /* 1.2.2 */
.nodeGetMemoryStats = bhyveNodeGetMemoryStats, /* 1.2.2 */
.nodeGetInfo = bhyveNodeGetInfo, /* 1.2.3 */
diff --git a/src/bhyve/bhyve_process.c b/src/bhyve/bhyve_process.c
index a557bc5..e1f4324 100644
--- a/src/bhyve/bhyve_process.c
+++ b/src/bhyve/bhyve_process.c
@@ -22,7 +22,11 @@
#include <config.h>
#include <fcntl.h>
+#include <kvm.h>
+#include <sys/param.h>
#include <sys/types.h>
+#include <sys/sysctl.h>
+#include <sys/user.h>
#include <sys/ioctl.h>
#include <net/if.h>
#include <net/if_tap.h>
@@ -41,11 +45,15 @@
#include "virnetdev.h"
#include "virnetdevbridge.h"
#include "virnetdevtap.h"
+#include "virtypedparam.h"
#define VIR_FROM_THIS VIR_FROM_BHYVE
VIR_LOG_INIT("bhyve.bhyve_process");
+#define BHYVE_TOTAL_CPU_STAT_PARAM 1
+#define BHYVE_PER_CPU_STAT_PARAM 1
+
static virDomainObjPtr
bhyveProcessAutoDestroy(virDomainObjPtr vm,
virConnectPtr conn ATTRIBUTE_UNUSED,
@@ -246,3 +254,131 @@ virBhyveProcessStop(bhyveConnPtr driver,
virCommandFree(cmd);
return ret;
}
+
+static int
+virBhyveExtractCpuTotal(char **const groups,
+ void *opaque)
+{
+ return virStrToLong_ull(groups[0], NULL, 10, opaque);
+}
+
+int
+virBhyveGetDomainTotalCpuStats(virDomainObjPtr vm,
+ virTypedParameterPtr params ATTRIBUTE_UNUSED,
+ unsigned int nparams)
+{
+ struct kinfo_proc* kp;
+ kvm_t* kd;
+ char errbuf[_POSIX2_LINE_MAX];
+ int nprocs;
+ int ret = -1;
+
+ if (nparams == 0)
+ return BHYVE_TOTAL_CPU_STAT_PARAM;
+
+ if ((kd = kvm_openfiles(NULL, NULL, NULL, O_RDONLY, errbuf)) == NULL) {
+ virReportError(VIR_ERR_SYSTEM_ERROR,
+ _("Unable to get kvm descriptor: %s"),
+ errbuf);
+ return -1;
+
+ }
+
+ kp = kvm_getprocs(kd, KERN_PROC_PID, vm->pid, &nprocs);
+ if (kp == NULL || nprocs != 1) {
+ virReportError(VIR_ERR_SYSTEM_ERROR,
+ _("Unable to obtain information about pid: %d"),
+ (int)vm->pid);
+ goto cleanup;
+ }
+
+ if (virTypedParameterAssign(¶ms[0], VIR_DOMAIN_CPU_STATS_CPUTIME,
+ VIR_TYPED_PARAM_ULLONG,
+ kp->ki_runtime * 1000ul) < 0)
+ goto cleanup;
+
+ ret = nparams;
+
+ cleanup:
+ kvm_close(kd);
+
+ return ret;
+}
+
+#define TSC_TO_NSEC(x) (unsigned long long)((double)x * (1000.0 * 1000.0 * 1000.0 / (double)tsc_freq))
+
+int
+virBhyveGetDomainPercpuStats(virDomainObjPtr vm,
+ virTypedParameterPtr params,
+ unsigned int nparams,
+ int start_cpu,
+ unsigned int ncpus)
+{
+ virCommandPtr cmd = NULL;
+ int need_cpus, ret = -1;
+ size_t i, tsc_freq_size;
+ unsigned long long tsc_freq;
+
+ if (nparams == 0 && ncpus != 0)
+ return BHYVE_PER_CPU_STAT_PARAM;
+
+ if (ncpus == 0)
+ return vm->def->vcpus;
+
+ if (start_cpu >= vm->def->vcpus) {
+ virReportError(VIR_ERR_INVALID_ARG,
+ _("start_cpu %d larger than maximum of %d"),
+ start_cpu, vm->def->vcpus - 1);
+ goto cleanup;
+ }
+
+ need_cpus = MIN(vm->def->vcpus, start_cpu + ncpus);
+
+ tsc_freq_size = sizeof(tsc_freq);
+ if (sysctlbyname("machdep.tsc_freq", &tsc_freq, &tsc_freq_size, NULL, 0) < 0) {
+ virReportSystemError(errno,
+ _("sysctl failed for '%s'"),
+ "machdep.tsc_freq");
+ return -1;
+ }
+
+ for (i = start_cpu; i < need_cpus; i++) {
+ unsigned long long cpu_stats;
+
+ const char *regexes[] = {
+ "^vcpu total runtime\\s+([0-9]+)$"
+ };
+ int vars[] = {
+ 1,
+ };
+
+ cmd = virCommandNew(BHYVECTL);
+ virCommandAddArgPair(cmd, "--vm", vm->def->name);
+ virCommandAddArg(cmd, "--get-stats");
+ virCommandAddArgFormat(cmd, "--cpu=%zu", i);
+
+ if (virCommandRunRegex(cmd,
+ 1,
+ regexes,
+ vars,
+ virBhyveExtractCpuTotal,
+ &cpu_stats,
+ NULL) < 0)
+ goto cleanup;
+
+ if (virTypedParameterAssign(¶ms[(i - start_cpu) * nparams],
+ VIR_DOMAIN_CPU_STATS_VCPUTIME,
+ VIR_TYPED_PARAM_ULLONG,
+ TSC_TO_NSEC(cpu_stats)) < 0)
+ goto cleanup;
+
+ virCommandFree(cmd);
+ cmd = NULL;
+ }
+
+ ret = nparams;
+
+ cleanup:
+ virCommandFree(cmd);
+ return ret;
+}
diff --git a/src/bhyve/bhyve_process.h b/src/bhyve/bhyve_process.h
index f91504e..2cc577a 100644
--- a/src/bhyve/bhyve_process.h
+++ b/src/bhyve/bhyve_process.h
@@ -34,6 +34,16 @@ int virBhyveProcessStop(bhyveConnPtr driver,
virDomainObjPtr vm,
virDomainShutoffReason reason);
+int virBhyveGetDomainTotalCpuStats(virDomainObjPtr vm,
+ virTypedParameterPtr params,
+ unsigned int nparams);
+
+int virBhyveGetDomainPercpuStats(virDomainObjPtr vm,
+ virTypedParameterPtr params,
+ unsigned int nparams,
+ int start_cpu,
+ unsigned int ncpus);
+
typedef enum {
VIR_BHYVE_PROCESS_START_AUTODESTROY = 1 << 0,
} bhyveProcessStartFlags;
--
1.9.0
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