[PATCH 8/9] perf: add alignment_faults software perf event support

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

Signed-off-by: Nitesh Konkar <nitkon12@xxxxxxxxxxxxxxxxxx>
---
 docs/formatdomain.html.in                   |  7 +++++++
 docs/news.xml                               |  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                          |  6 +++++-
 src/util/virperf.h                          |  1 +
 tests/genericxml2xmlindata/generic-perf.xml |  1 +
 tools/virsh.pod                             |  4 ++++
 10 files changed, 35 insertions(+), 3 deletions(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 50a6bdb..249cfe4 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1944,6 +1944,7 @@
   &lt;event name='cpu_migrations' enabled='no'/&gt;
   &lt;event name='page_faults_min' enabled='no'/&gt;
   &lt;event name='page_faults_maj' enabled='no'/&gt;
+  &lt;event name='alignment_faults' enabled='no'/&gt;
 &lt;/perf&gt;
 ...
 </pre>
@@ -2059,6 +2060,12 @@
           platform</td>
       <td><code>perf.page_faults_maj</code></td>
     </tr>
+    <tr>
+      <td><code>alignment_faults</code></td>
+      <td>the count of alignment faults by applications running on the
+          platform</td>
+      <td><code>perf.alignment_faults</code></td>
+    </tr>
   </table>
 
     <h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index fe533f2..b148b38 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -138,8 +138,8 @@
           executed, branch misses, bus cycles, stalled frontend
           cpu cycles, stalled backend cpu cycles, ref cpu cycles,
           cpu clock, task clock, page faults, context switches,
-          cpu migrations, page faults min and page faults maj by
-          applications running on the platform.
+          cpu migrations, page faults min, page faults maj and
+          alignment faults by applications running on the platform.
         </description>
       </change>
       <change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 5f986d6..6782bf5 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -440,6 +440,7 @@
               <value>cpu_migrations</value>
               <value>page_faults_min</value>
               <value>page_faults_maj</value>
+              <value>alignment_faults</value>
             </choice>
           </attribute>
           <attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index d16200f..7523872 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2258,6 +2258,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
  */
 # define VIR_PERF_PARAM_PAGE_FAULTS_MAJ  "page_faults_maj"
 
+/**
+ * VIR_PERF_PARAM_ALIGNMENT_FAULTS:
+ *
+ * Macro for typed parameter name that represents alignment_faults
+ * perf event which can be used to measure the count of alignment
+ * faults by applications running on the platform. It corresponds
+ * to the "perf.alignment_faults" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_ALIGNMENT_FAULTS  "alignment_faults"
+
 int virDomainGetPerfEvents(virDomainPtr dom,
                            virTypedParameterPtr *params,
                            int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 1d7c181..bad9fea 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11268,6 +11268,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
  *     "perf.page_faults_maj" - The count of major page faults as unsigned long
  *                              long. It is produced by the page_faults_maj
  *                              perf event
+ *     "perf.alignment_faults" - The count of alignment faults as unsigned long
+ *                              long. It is produced by the alignment_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 c88bf5a..89394be 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9556,6 +9556,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
                                VIR_PERF_PARAM_CPU_MIGRATIONS, VIR_TYPED_PARAM_BOOLEAN,
                                VIR_PERF_PARAM_PAGE_FAULTS_MIN, VIR_TYPED_PARAM_BOOLEAN,
                                VIR_PERF_PARAM_PAGE_FAULTS_MAJ, VIR_TYPED_PARAM_BOOLEAN,
+                               VIR_PERF_PARAM_ALIGNMENT_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
                                NULL) < 0)
         return -1;
 
diff --git a/src/util/virperf.c b/src/util/virperf.c
index 37f61e2..c25c57a 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -46,7 +46,8 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
               "stalled_cycles_backend", "ref_cpu_cycles",
               "cpu_clock", "task_clock", "page_faults",
               "context_switches", "cpu_migrations",
-              "page_faults_min", "page_faults_maj");
+              "page_faults_min", "page_faults_maj",
+              "alignment_faults");
 
 struct virPerfEvent {
     int type;
@@ -136,6 +137,9 @@ static struct virPerfEventAttr attrs[] = {
     {.type = VIR_PERF_EVENT_PAGE_FAULTS_MAJ,
      .attrType = PERF_TYPE_SOFTWARE,
      .attrConfig = PERF_COUNT_SW_PAGE_FAULTS_MAJ},
+    {.type = VIR_PERF_EVENT_ALIGNMENT_FAULTS,
+     .attrType = PERF_TYPE_SOFTWARE,
+     .attrConfig = PERF_COUNT_SW_ALIGNMENT_FAULTS},
 };
 typedef struct virPerfEventAttr *virPerfEventAttrPtr;
 
diff --git a/src/util/virperf.h b/src/util/virperf.h
index e99c870..1c51e50 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -54,6 +54,7 @@ typedef enum {
     VIR_PERF_EVENT_CPU_MIGRATIONS,   /* Count of cpu migrations */
     VIR_PERF_EVENT_PAGE_FAULTS_MIN,   /* Count of minor page faults */
     VIR_PERF_EVENT_PAGE_FAULTS_MAJ,   /* Count of major page faults */
+    VIR_PERF_EVENT_ALIGNMENT_FAULTS,   /* Count of alignment faults */
 
     VIR_PERF_EVENT_LAST
 } virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index a5b6dfb..b48f96c 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -33,6 +33,7 @@
     <event name='cpu_migrations' enabled='yes'/>
     <event name='page_faults_min' enabled='yes'/>
     <event name='page_faults_maj' enabled='yes'/>
+    <event name='alignment_faults' enabled='yes'/>
   </perf>
   <devices>
   </devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index d6bec4d..1f1b9c9 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -953,6 +953,7 @@ I<--perf> returns the statistics of all enabled perf events:
 "perf.cpu_migrations" - the count of cpu migrations
 "perf.page_faults_min" - the count of minor page faults
 "perf.page_faults_maj" - the count of major page faults
+"perf.alignment_faults" - the count of alignment faults
 
 See the B<perf> command for more details about each event.
 
@@ -2336,6 +2337,9 @@ B<Valid perf event names>
                     the page was not present in the page cache, and therefore
                     had to be fetched from storage, by applications
                     running on the platform
+  alignment_faults - Provides the count of alignment faults, that is when
+                     the load or store is not aligned properly, 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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