[PATCH 2/9] perf: add task_clock software perf event support

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This patch adds support and documentation for
the task_clock perf event.

Signed-off-by: Nitesh Konkar <nitkon12@xxxxxxxxxxxxxxxxxx>
---
 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 @@
   &lt;event name='stalled_cycles_backend' enabled='no'/&gt;
   &lt;event name='ref_cpu_cycles' enabled='no'/&gt;
   &lt;event name='cpu_clock' enabled='no'/&gt;
+  &lt;event name='task_clock' enabled='no'/&gt;
 &lt;/perf&gt;
 ...
 </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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