[libvirt] [PATCH 2/9] perf: add task_clock software perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Fri Jan 27 11:01:01 UTC 2017
This patch adds support and documentation for
the task_clock perf event.
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 6 ++++++
docs/news.xml | 5 +++--
docs/schemas/domaincommon.rng | 1 +
include/libvirt/libvirt-domain.h | 10 ++++++++++
src/libvirt-domain.c | 2 ++
src/qemu/qemu_driver.c | 1 +
src/util/virperf.c | 5 ++++-
src/util/virperf.h | 1 +
tests/genericxml2xmlindata/generic-perf.xml | 1 +
tools/virsh.pod | 3 +++
10 files changed, 32 insertions(+), 3 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index e44e758..1ed5db7 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1938,6 +1938,7 @@
<event name='stalled_cycles_backend' enabled='no'/>
<event name='ref_cpu_cycles' enabled='no'/>
<event name='cpu_clock' enabled='no'/>
+ <event name='task_clock' enabled='no'/>
</perf>
...
</pre>
@@ -2021,6 +2022,11 @@
<td>the count of cpu clock by applications running on the platform</td>
<td><code>perf.cpu_clock</code></td>
</tr>
+ <tr>
+ <td><code>task_clock</code></td>
+ <td>the count of task clock by applications running on the platform</td>
+ <td><code>perf.task_clock</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index ec113ab..38373c0 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -136,8 +136,9 @@
<description>
Add support to get the count of branch instructions
executed, branch misses, bus cycles, stalled frontend
- cpu cycles, stalled backend cpu cycles, ref cpu cycles
- and cpu clock by applications running on the platform.
+ cpu cycles, stalled backend cpu cycles, ref cpu cycles,
+ cpu clock and task clock by applications running on the
+ platform.
</description>
</change>
<change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 86a39c8..6ee2c6f 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -434,6 +434,7 @@
<value>stalled_cycles_backend</value>
<value>ref_cpu_cycles</value>
<value>cpu_clock</value>
+ <value>task_clock</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index bffe955..f4f1c74 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2198,6 +2198,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_CPU_CLOCK "cpu_clock"
+/**
+ * VIR_PERF_PARAM_TASK_CLOCK:
+ *
+ * Macro for typed parameter name that represents task_clock
+ * perf event which can be used to measure the count of task
+ * clock by applications running on the platform. It corresponds
+ * to the "perf.task_clock" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_TASK_CLOCK "task_clock"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 001cdd7..6875848 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11252,6 +11252,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* ref_cpu_cycles perf event.
* "perf.cpu_clock" - The count of cpu clock as unsigned long long. It is
* produced by the cpu_clock perf event.
+ * "perf.task_clock" - The count of task clock as unsigned long long. It is
+ * produced by the task_clock 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 ff4803c..285156d 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9550,6 +9550,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_STALLED_CYCLES_BACKEND, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_REF_CPU_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CPU_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_TASK_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index 3629e5b..e19cfea 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -44,7 +44,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"branch_instructions", "branch_misses",
"bus_cycles", "stalled_cycles_frontend",
"stalled_cycles_backend", "ref_cpu_cycles",
- "cpu_clock");
+ "cpu_clock", "task_clock");
struct virPerfEvent {
int type;
@@ -116,6 +116,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_CPU_CLOCK,
.attrType = PERF_TYPE_SOFTWARE,
.attrConfig = PERF_COUNT_SW_CPU_CLOCK},
+ {.type = VIR_PERF_EVENT_TASK_CLOCK,
+ .attrType = PERF_TYPE_SOFTWARE,
+ .attrConfig = PERF_COUNT_SW_TASK_CLOCK}
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 81f1e20..b9e8a75 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -48,6 +48,7 @@ typedef enum {
processor pipeline */
VIR_PERF_EVENT_REF_CPU_CYCLES, /* Count of ref cpu cycles */
VIR_PERF_EVENT_CPU_CLOCK, /* Count of cpu clock */
+ VIR_PERF_EVENT_TASK_CLOCK, /* Count of task clock */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index 3e7834e..5ebc0a2 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -27,6 +27,7 @@
<event name='stalled_cycles_backend' enabled='yes'/>
<event name='ref_cpu_cycles' enabled='yes'/>
<event name='cpu_clock' enabled='yes'/>
+ <event name='task_clock' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 2f0bf36..958e473 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -947,6 +947,7 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.stalled_cycles_backend" - the count of stalled backend cpu cycles,
"perf.ref_cpu_cycles" - the count of ref cpu cycles
"perf.cpu_clock" - the count of cpu clock
+"perf.task_clock" - the count of task clock
See the B<perf> command for more details about each event.
@@ -2313,6 +2314,8 @@ B<Valid perf event names>
applications running on the platform.
cpu_clock - Provides the cpu clock time consumed by applications
running on the platform.
+ task_clock - Provides the task clock time consumed 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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