[PATCH 3/9] perf: add page_faults software perf event support

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

Signed-off-by: Nitesh Konkar <nitkon12@xxxxxxxxxxxxxxxxxx>
---
 docs/formatdomain.html.in                   |  6 ++++++
 docs/news.xml                               |  4 ++--
 docs/schemas/domaincommon.rng               |  1 +
 include/libvirt/libvirt-domain.h            | 11 +++++++++++
 src/libvirt-domain.c                        |  2 ++
 src/qemu/qemu_driver.c                      |  1 +
 src/util/virperf.c                          |  7 +++++--
 src/util/virperf.h                          |  1 +
 tests/genericxml2xmlindata/generic-perf.xml |  1 +
 tools/virsh.pod                             |  3 +++
 10 files changed, 33 insertions(+), 4 deletions(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 1ed5db7..2071eea 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1939,6 +1939,7 @@
   &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;event name='page_faults' enabled='no'/&gt;
 &lt;/perf&gt;
 ...
 </pre>
@@ -2027,6 +2028,11 @@
       <td>the count of task clock by applications running on the platform</td>
       <td><code>perf.task_clock</code></td>
     </tr>
+    <tr>
+      <td><code>page_faults</code></td>
+      <td>the count of page faults by applications running on the platform</td>
+      <td><code>perf.page_faults</code></td>
+    </tr>
   </table>
 
     <h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index 38373c0..14beed6 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -137,8 +137,8 @@
           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,
-          cpu clock and task clock by applications running on the
-          platform.
+          cpu clock, task clock and page faults by applications
+          running on the platform.
         </description>
       </change>
       <change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 6ee2c6f..a7727e7 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -435,6 +435,7 @@
               <value>ref_cpu_cycles</value>
               <value>cpu_clock</value>
               <value>task_clock</value>
+              <value>page_faults</value>
             </choice>
           </attribute>
           <attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index f4f1c74..36619b5 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2208,6 +2208,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
  */
 # define VIR_PERF_PARAM_TASK_CLOCK "task_clock"
 
+/**
+* VIR_PERF_PARAM_PAGE_FAULTS:
+*
+* Macro for typed parameter name that represents page_faults
+* perf event which can be used to measure the count of page
+* faults by applications running on the platform. It corresponds
+* to the "perf.page_faults" field in the *Stats APIs.
+*/
+# define VIR_PERF_PARAM_PAGE_FAULTS "page_faults"
+
+
 int virDomainGetPerfEvents(virDomainPtr dom,
                            virTypedParameterPtr *params,
                            int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 6875848..a923acc 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11254,6 +11254,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
  *                        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.
+ *     "perf.page_faults" - The count of page faults as unsigned long long. It is
+ *                         produced by the page_faults 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 285156d..88f649e 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9551,6 +9551,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
                                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,
+                               VIR_PERF_PARAM_PAGE_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
                                NULL) < 0)
         return -1;
 
diff --git a/src/util/virperf.c b/src/util/virperf.c
index e19cfea..3282aca 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", "task_clock");
+              "cpu_clock", "task_clock", "page_faults");
 
 struct virPerfEvent {
     int type;
@@ -118,7 +118,10 @@ static struct virPerfEventAttr attrs[] = {
      .attrConfig = PERF_COUNT_SW_CPU_CLOCK},
     {.type = VIR_PERF_EVENT_TASK_CLOCK,
      .attrType = PERF_TYPE_SOFTWARE,
-     .attrConfig = PERF_COUNT_SW_TASK_CLOCK}
+     .attrConfig = PERF_COUNT_SW_TASK_CLOCK},
+    {.type = VIR_PERF_EVENT_PAGE_FAULTS,
+     .attrType = PERF_TYPE_SOFTWARE,
+     .attrConfig = PERF_COUNT_SW_PAGE_FAULTS},
 };
 typedef struct virPerfEventAttr *virPerfEventAttrPtr;
 
diff --git a/src/util/virperf.h b/src/util/virperf.h
index b9e8a75..fbc5ae3 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -49,6 +49,7 @@ typedef enum {
     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_PAGE_FAULTS,   /* Count of page faults */
 
     VIR_PERF_EVENT_LAST
 } virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index 5ebc0a2..3f27887 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -28,6 +28,7 @@
     <event name='ref_cpu_cycles' enabled='yes'/>
     <event name='cpu_clock' enabled='yes'/>
     <event name='task_clock' enabled='yes'/>
+    <event name='page_faults' enabled='yes'/>
   </perf>
   <devices>
   </devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 958e473..f7be74e 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -948,6 +948,7 @@ I<--perf> returns the statistics of all enabled perf events:
 "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
+"perf.page_faults" - the count of page faults
 
 See the B<perf> command for more details about each event.
 
@@ -2316,6 +2317,8 @@ B<Valid perf event names>
               running on the platform.
   task_clock - Provides the task clock time consumed by applications
                running on the platform
+  page_faults - Provides the count of page faults 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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