[PATCH 1/2] perf: add cache_l1d perf event support

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This patch adds support and documentation for
a generalized hardware cache event called cache_l1d
perf event.

Signed-off-by: Nitesh Konkar <nitkon12@xxxxxxxxxxxxxxxxxx>
---
 docs/formatdomain.html.in                   |  7 +++++++
 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                          |  6 +++++-
 src/util/virperf.h                          |  1 +
 tests/genericxml2xmlindata/generic-perf.xml |  1 +
 tools/virsh.pod                             |  5 ++++-
 9 files changed, 33 insertions(+), 2 deletions(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index f7bef51..e192b77 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1937,6 +1937,7 @@
   &lt;event name='stalled_cycles_frontend' enabled='no'/&gt;
   &lt;event name='stalled_cycles_backend' enabled='no'/&gt;
   &lt;event name='ref_cpu_cycles' enabled='no'/&gt;
+  &lt;event name='cache_l1d' enabled='no'/&gt;
 &lt;/perf&gt;
 ...
 </pre>
@@ -2015,6 +2016,12 @@
          by applications running on the platform</td>
       <td><code>perf.ref_cpu_cycles</code></td>
     </tr>
+    <tr>
+      <td><code>cache_l1d</code></td>
+      <td>the count of total level 1 data cache by applications running on
+           the platform</td>
+      <td><code>perf.cache_l1d</code></td>
+    </tr>
   </table>
 
     <h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 4d76315..be0a609 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -433,6 +433,7 @@
               <value>stalled_cycles_frontend</value>
               <value>stalled_cycles_backend</value>
               <value>ref_cpu_cycles</value>
+              <value>cache_l1d</value>
             </choice>
           </attribute>
           <attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 6362947..479d417 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2188,6 +2188,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
  */
 # define VIR_PERF_PARAM_REF_CPU_CYCLES "ref_cpu_cycles"
 
+/**
+ * VIR_PERF_PARAM_CACHE_L1D:
+ *
+ * Macro for typed parameter name that represents cache_l1d
+ * perf event which can be used to measure the count of total
+ * level 1 data cache by applications running on the platform.
+ * It corresponds to the "perf.cache_l1d" field in the
+ * *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CACHE_L1D "cache_l1d"
+
 int virDomainGetPerfEvents(virDomainPtr dom,
                            virTypedParameterPtr *params,
                            int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 5b3e842..3023f30 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11250,6 +11250,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
  *                             CPU frequency scaling by applications running
  *                             as unsigned long long. It is produced by the
  *                             ref_cpu_cycles perf event.
+ *     "perf.cache_l1d" - The count of total level 1 data cache as unsigned
+ *                        long long. It is produced by cache_l1d 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 b359e77..80db495 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9859,6 +9859,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
                                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,
+                               VIR_PERF_PARAM_CACHE_L1D, VIR_TYPED_PARAM_BOOLEAN,
                                NULL) < 0)
         return -1;
 
diff --git a/src/util/virperf.c b/src/util/virperf.c
index f64692b..8554723 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -43,7 +43,8 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
               "cache_references", "cache_misses",
               "branch_instructions", "branch_misses",
               "bus_cycles", "stalled_cycles_frontend",
-              "stalled_cycles_backend", "ref_cpu_cycles");
+              "stalled_cycles_backend", "ref_cpu_cycles",
+              "cache_l1d");
 
 struct virPerfEvent {
     int type;
@@ -112,6 +113,9 @@ static struct virPerfEventAttr attrs[] = {
      .attrConfig = 0,
 # endif
     },
+    {.type = VIR_PERF_EVENT_CACHE_L1D,
+     .attrType = PERF_TYPE_HW_CACHE,
+     .attrConfig = PERF_COUNT_HW_CACHE_L1D},
 };
 typedef struct virPerfEventAttr *virPerfEventAttrPtr;
 
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 1f43c92..4c562af 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -47,6 +47,7 @@ typedef enum {
                                               the backend of the instruction
                                               processor pipeline */
     VIR_PERF_EVENT_REF_CPU_CYCLES,   /* Count of ref cpu cycles */
+    VIR_PERF_EVENT_CACHE_L1D, /* Count of level 1 data cache*/
 
     VIR_PERF_EVENT_LAST
 } virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index 437cd65..d1418d0 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -26,6 +26,7 @@
     <event name='stalled_cycles_frontend' enabled='yes'/>
     <event name='stalled_cycles_backend' enabled='yes'/>
     <event name='ref_cpu_cycles' enabled='yes'/>
+    <event name='cache_l1d' enabled='yes'/>
   </perf>
   <devices>
   </devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index ef91223..e039db5 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -951,7 +951,8 @@ I<--perf> returns the statistics of all enabled perf events:
 "perf.bus_cycles" - the count of bus cycles,
 "perf.stalled_cycles_frontend" - the count of stalled frontend cpu cycles,
 "perf.stalled_cycles_backend" - the count of stalled backend cpu cycles,
-"perf.ref_cpu_cycles" - the count of ref cpu cycles
+"perf.ref_cpu_cycles" - the count of ref cpu cycles,
+"perf.cache_l1d" - the count of level 1 data cache
 
 See the B<perf> command for more details about each event.
 
@@ -2316,6 +2317,8 @@ B<Valid perf event names>
   ref_cpu_cycles   -  Provides the count of total cpu cycles
                       not affected by CPU frequency scaling by
                       applications running on the platform.
+  cache_l1d - Provides the count of total level 1 data cache
+              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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