[libvirt] [PATCH 1/1] perf: add more perf events support
Qiaowei Ren
qiaowei.ren at intel.com
Tue May 31 02:48:15 UTC 2016
With current perf framework, this patch adds support to more perf
events, including cache missing, cache peference, cpu cycles,
instrction, etc..
Signed-off-by: Qiaowei Ren <qiaowei.ren at intel.com>
---
include/libvirt/libvirt-domain.h | 39 ++++++++++++++++++++++++
src/libvirt-domain.c | 8 +++++
src/qemu/qemu_driver.c | 23 +++++++-------
src/util/virperf.c | 65 +++++++++++++++++++++++++++++++++++++++-
src/util/virperf.h | 4 +++
5 files changed, 126 insertions(+), 13 deletions(-)
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index cba4fa5..99c4c48 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -1928,6 +1928,45 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_MBML "mbml"
+/**
+ * VIR_PERF_PARAM_CACHE_MISSES:
+ *
+ * Macro for typed parameter name that represents cache_misses perf
+ * event which can be used to measure the amount of cache missing by
+ * applications running on the platform. It corresponds to the
+ * "perf.cache_misses" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CACHE_MISSES "cache_misses"
+
+/**
+ * VIR_PERF_PARAM_CACHE_REFERENCES:
+ *
+ * Macro for typed parameter name that represents cache_peferences
+ * perf event which can be used to measure the amount of cache hit
+ * by applications running on the platform. It corresponds to the
+ * "perf.cache_peferences" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CACHE_REFERENCES "cache_peferences"
+
+/**
+ * VIR_PERF_PARAM_INSTRUCTIONS:
+ *
+ * Macro for typed parameter name that represents instructions perf
+ * event which can be used to measure the amount of instructions
+ * by applications running on the platform. It corresponds to the
+ * "perf.instructions" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_INSTRUCTIONS "instructions"
+
+/**
+ * VIR_PERF_PARAM_CPU_CYCLES:
+ *
+ * Macro for typed parameter name that represents cpu_cycles perf event
+ * which can be used to measure how many cycles one instruction needs.
+ * It corresponds to the "perf.cpu_cycles" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CPU_CYCLES "cpu_cycles"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 73ae369..ef71b31 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11452,6 +11452,14 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.mbml" - the amount of data (bytes/s) sent through the memory controller
* on the socket as unsigned long long. It is produced by mbml
* perf event.
+ * "perf.cache_misses" - the amount of cache missing as unsigned long long.
+ * It is produced by cache_misses perf event.
+ * "perf.cache_peferences" - the amount of cache hit as unsigned long long.
+ * It is produced by cache_peferences perf event.
+ * "perf.instructions" - the amount of instructions as unsigned long long.
+ * It is produced by instructions perf event.
+ * "perf.cpu_cycles" - the amount of cycles one instruction needs as unsigned
+ * long long. It is produced by cpu_cycles perf event.
*
* Note that entire stats groups or individual stat fields may be missing from
* the output in case they are not supported by the given hypervisor, are not
diff --git a/src/qemu/qemu_driver.c b/src/qemu/qemu_driver.c
index 10d3e3d..d465ec5 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9756,6 +9756,10 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_CMT, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_MBMT, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_MBML, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_CACHE_MISSES, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_CACHE_REFERENCES, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_INSTRUCTIONS, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_CPU_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
@@ -19071,10 +19075,10 @@ qemuDomainGetStatsBlock(virQEMUDriverPtr driver,
#undef QEMU_ADD_COUNT_PARAM
static int
-qemuDomainGetStatsPerfRdt(virPerfPtr perf,
- virPerfEventType type,
- virDomainStatsRecordPtr record,
- int *maxparams)
+qemuDomainGetStatsPerfOneEvent(virPerfPtr perf,
+ virPerfEventType type,
+ virDomainStatsRecordPtr record,
+ int *maxparams)
{
char param_name[VIR_TYPED_PARAM_FIELD_LENGTH];
uint64_t value = 0;
@@ -19110,14 +19114,9 @@ qemuDomainGetStatsPerf(virQEMUDriverPtr driver ATTRIBUTE_UNUSED,
if (!virPerfEventIsEnabled(priv->perf, i))
continue;
- switch (i) {
- case VIR_PERF_EVENT_CMT:
- case VIR_PERF_EVENT_MBMT:
- case VIR_PERF_EVENT_MBML:
- if (qemuDomainGetStatsPerfRdt(priv->perf, i, record, maxparams) < 0)
- goto cleanup;
- break;
- }
+ if (qemuDomainGetStatsPerfOneEvent(priv->perf, i,
+ record, maxparams) < 0)
+ goto cleanup;
}
ret = 0;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index 450b3ba..38f2158 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -38,7 +38,9 @@ VIR_LOG_INIT("util.perf");
#define VIR_FROM_THIS VIR_FROM_PERF
VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
- "cmt", "mbmt", "mbml");
+ "cmt", "mbmt", "mbml",
+ "cache_misses", "cache_peferences",
+ "instructions", "cpu_cycles");
struct virPerfEvent {
int type;
@@ -186,6 +188,60 @@ virPerfRdtEnable(virPerfEventPtr event,
return -1;
}
+static int
+virPerfGeneralEnable(virPerfEventPtr event,
+ pid_t pid)
+{
+ struct perf_event_attr attr;
+
+ memset(&attr, 0, sizeof(attr));
+ attr.size = sizeof(attr);
+ attr.inherit = 1;
+ attr.disabled = 1;
+ attr.enable_on_exec = 0;
+
+ switch (event->type) {
+ case VIR_PERF_EVENT_CACHE_MISSES:
+ attr.type = PERF_TYPE_HARDWARE;
+ attr.config = PERF_COUNT_HW_CACHE_MISSES;
+ break;
+ case VIR_PERF_EVENT_CACHE_REFERENCES:
+ attr.type = PERF_TYPE_HARDWARE;
+ attr.config = PERF_COUNT_HW_CACHE_REFERENCES;
+ break;
+ case VIR_PERF_EVENT_INSTRUCTIONS:
+ attr.type = PERF_TYPE_HARDWARE;
+ attr.config = PERF_COUNT_HW_INSTRUCTIONS;
+ break;
+ case VIR_PERF_EVENT_CPU_CYCLES:
+ attr.type = PERF_TYPE_HARDWARE;
+ attr.config = PERF_COUNT_HW_CPU_CYCLES;
+ break;
+ }
+
+ event->fd = syscall(__NR_perf_event_open, &attr, pid, -1, -1, 0);
+ if (event->fd < 0) {
+ virReportSystemError(errno,
+ _("Unable to open perf event for %s"),
+ virPerfEventTypeToString(event->type));
+ goto error;
+ }
+
+ if (ioctl(event->fd, PERF_EVENT_IOC_ENABLE) < 0) {
+ virReportSystemError(errno,
+ _("Unable to enable perf event for %s"),
+ virPerfEventTypeToString(event->type));
+ goto error;
+ }
+
+ event->enabled = true;
+ return 0;
+
+ error:
+ VIR_FORCE_CLOSE(event->fd);
+ return -1;
+}
+
int
virPerfEventEnable(virPerfPtr perf,
virPerfEventType type,
@@ -202,6 +258,13 @@ virPerfEventEnable(virPerfPtr perf,
if (virPerfRdtEnable(event, pid) < 0)
return -1;
break;
+ case VIR_PERF_EVENT_CACHE_MISSES:
+ case VIR_PERF_EVENT_CACHE_REFERENCES:
+ case VIR_PERF_EVENT_INSTRUCTIONS:
+ case VIR_PERF_EVENT_CPU_CYCLES:
+ if (virPerfGeneralEnable(event, pid) < 0)
+ return -1;
+ break;
case VIR_PERF_EVENT_LAST:
virReportError(VIR_ERR_INTERNAL_ERROR,
_("Unexpected perf event type=%d"), type);
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 769e85a..2cab339 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -28,6 +28,10 @@ typedef enum {
VIR_PERF_EVENT_CMT,
VIR_PERF_EVENT_MBMT,
VIR_PERF_EVENT_MBML,
+ VIR_PERF_EVENT_CACHE_MISSES,
+ VIR_PERF_EVENT_CACHE_REFERENCES,
+ VIR_PERF_EVENT_INSTRUCTIONS,
+ VIR_PERF_EVENT_CPU_CYCLES,
VIR_PERF_EVENT_LAST
} virPerfEventType;
--
1.9.1
More information about the libvir-list
mailing list