[libvirt] [PATCH 4/4] perf: add ref_cpu_cycles perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Tue Dec 13 16:01:41 UTC 2016
This patch adds support and documentation for
the ref_cpu_cycles perf event.
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 6 ++++++
docs/news.html.in | 4 ++--
docs/schemas/domaincommon.rng | 1 +
include/libvirt/libvirt-domain.h | 10 ++++++++++
src/libvirt-domain.c | 3 +++
src/qemu/qemu_driver.c | 1 +
src/util/virperf.c | 5 ++++-
src/util/virperf.h | 5 +++--
tests/genericxml2xmlindata/generic-perf.xml | 1 +
tools/virsh.pod | 5 ++++-
10 files changed, 35 insertions(+), 6 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 6cff639..3dbd449 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1932,6 +1932,7 @@
<event name='bus_cycles' enabled='no'/>
<event name='stalled_cycles_frontend' enabled='no'/>
<event name='stalled_cycles_backend' enabled='no'/>
+ <event name='ref_cpu_cycles' enabled='no'/>
</perf>
...
</pre>
@@ -2002,6 +2003,11 @@
<td>the count of stalled cycles backend by applications running on the platform</td>
<td><code>perf.stalled_cycles_backend</code></td>
</tr>
+ <tr>
+ <td><code>ref_cpu_cycles</code></td>
+ <td>the count of ref cpu cycles by applications running on the platform</td>
+ <td><code>perf.ref_cpu_cycles</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.html.in b/docs/news.html.in
index 4e0a4da..21c7de1 100644
--- a/docs/news.html.in
+++ b/docs/news.html.in
@@ -32,8 +32,8 @@
<li>perf: Add more perf statistics<br/>
Add support to get the count of branch instructions
executed, branch misses, bus cycles, stalled cycles
- frontend, stalled cycles backend by applications
- running on the platform
+ frontend, stalled cycles backend and ref cpu cycles
+ by applications running on the platform
</li>
</ul>
</li>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index e5b5fb5..4d76315 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -432,6 +432,7 @@
<value>bus_cycles</value>
<value>stalled_cycles_frontend</value>
<value>stalled_cycles_backend</value>
+ <value>ref_cpu_cycles</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 86db4ae..1723f83 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2175,6 +2175,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_STALLED_CYCLES_BACKEND "stalled_cycles_backend"
+/**
+ * VIR_PERF_PARAM_REF_CPU_CYCLES:
+ *
+ * Macro for typed parameter name that represents ref_cpu_cycles
+ * perf event which can be used to measure the count of ref cpu cycles
+ * by applications running on the platform. It corresponds to the
+ * "perf.ref_cpu_cycles" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_REF_CPU_CYCLES "ref_cpu_cycles"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index de865b0..09d45c9 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11242,6 +11242,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.stalled_cycles_backend" - The count of stalled cycles backend
* as unsigned long long. It is produced
* by stalled_cycles_backend perf event.
+ * "perf.ref_cpu_cycles" - The count of ref cpu cycles as unsigned
+ * long long. It is produced by
+ * ref_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 cf92e43..398aefc 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9857,6 +9857,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_BUS_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_STALLED_CYCLES_FRONTEND, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_STALLED_CYCLES_BACKEND, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_REF_CPU_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index c9a0e39..49ec258 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -43,7 +43,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"cache_references", "cache_misses",
"branch_instructions", "branch_misses",
"bus_cycles", "stalled_cycles_frontend",
- "stalled_cycles_backend");
+ "stalled_cycles_backend", "ref_cpu_cycles");
struct virPerfEvent {
int type;
@@ -103,6 +103,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_STALLED_CYCLES_BACKEND,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_STALLED_CYCLES_BACKEND},
+ {.type = VIR_PERF_EVENT_REF_CPU_CYCLES,
+ .attrType = PERF_TYPE_HARDWARE,
+ .attrConfig = PERF_COUNT_HW_REF_CPU_CYCLES},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 6dfad34..c002510 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -40,8 +40,9 @@ typedef enum {
for applications */
VIR_PERF_EVENT_BRANCH_MISSES, /* Count of branch misses for applications */
VIR_PERF_EVENT_BUS_CYCLES, /* Count of bus cycles for applications*/
- VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND, /*Count of stalled cycles frontend*/
- VIR_PERF_EVENT_STALLED_CYCLES_BACKEND, /*Count of stalled cycles backend*/
+ VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND, /* Count of stalled cycles frontend */
+ VIR_PERF_EVENT_STALLED_CYCLES_BACKEND, /* Count of stalled cycles backend */
+ VIR_PERF_EVENT_REF_CPU_CYCLES, /* Count of ref cpu cycles */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index f01d574..437cd65 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -25,6 +25,7 @@
<event name='bus_cycles' enabled='yes'/>
<event name='stalled_cycles_frontend' enabled='yes'/>
<event name='stalled_cycles_backend' enabled='yes'/>
+ <event name='ref_cpu_cycles' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index ada1dce..539717c 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -950,7 +950,8 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.branch_misses" - the count of branch misses,
"perf.bus_cycles" - the count of bus cycles,
"perf.stalled_cycles_frontend" - the count of stalled cycles frontend,
-"perf.stalled_cycles_backend" - the count of stalled cycles backend
+"perf.stalled_cycles_backend" - the count of stalled cycles backend,
+"perf.ref_cpu_cycles" - the count of ref cpu cycles
See the B<perf> command for more details about each event.
@@ -2310,6 +2311,8 @@ B<Valid perf event names>
stalled_cycles_backend - Provides the count of stalled cycles
backend by applications running on
the platform.
+ ref_cpu_cycles - Provides the count of ref cpu cycles
+ by applications running on the platform.
B<Note>: The statistics can be retrieved using the B<domstats> command using
the I<--perf> flag.
--
1.9.3
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