Hello,

My earlier patch with commit id : ae16c95f1bb5591c27676c5de8d383e5612c3568 (Link: https://www.redhat.com/archives/libvir-list/2017-January/msg00226.html )
computed the .attrConfig value incorrectly. The right way to  compute .attrConfig value for a PERF_TYPE_HW_CACHE event is listed here (https://linux.die.net/man/2/perf_event_open) . I somehow missed this info at the time of sending the patch and have sent another patch to rectify it.

Link: https://www.redhat.com/archives/libvir-list/2017-January/msg00679.html

I think this patch needs to be in before 3.0.0 is released else a wrong value shall be displayed on enabling and displaying cache_l1d perf event.

Thanks,
Nitesh Konkar.


On Sat, Jan 14, 2017 at 1:49 PM, Nitesh Konkar <niteshkonkar.libvirt@gmail.com> wrote:
This patch computes the .attrConfig value for
cache_l1d correctly and updates the documentation.
The cache_l1d perf event now is renamed as
cache_l1dra perf event for measuring read accesses
for level 1 data cache

Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>
---
 docs/formatdomain.html.in                   | 12 ++++++------
 docs/news.xml                               |  5 +++--
 docs/schemas/domaincommon.rng               |  2 +-
 include/libvirt/libvirt-domain.h            | 12 ++++++------
 src/libvirt-domain.c                        |  5 +++--
 src/qemu/qemu_driver.c                      |  2 +-
 src/util/virperf.c                          |  8 +++++---
 src/util/virperf.h                          |  2 +-
 tests/genericxml2xmlindata/generic-perf.xml |  2 +-
 tools/virsh.pod                             |  6 +++---
 10 files changed, 30 insertions(+), 26 deletions(-)

diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 30cb196..a8ee2db 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1937,7 +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;event name='cache_l1dra' enabled='no'/&gt;
 &lt;/perf&gt;
 ...
 </pre>
@@ -2013,14 +2013,14 @@
     <tr>
       <td><code>ref_cpu_cycles</code></td>
       <td>the count of total cpu cycles not affected by CPU frequency scaling
-         by applications running on the platform</td>
+          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>
+      <td><code>cache_l1dra</code></td>
+      <td>the count of total read accesses for level 1 data cache by
+          applications running on the platform</td>
+      <td><code>perf.cache_l1dra</code></td>
     </tr>
   </table>

diff --git a/docs/news.xml b/docs/news.xml
index baafcff..93ab40c 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -82,8 +82,9 @@
         <description>
           Add support to get the count of branch instructions
           executed, branch misses, bus cycles, stalled frontend
-          cpu cycles, stalled backend cpu cycles, and ref cpu
-          cycles by applications running on the platform.
+          cpu cycles, stalled backend cpu cycles, ref cpu
+          cycles and cache l1dra by applications running on the
+          platform.
         </description>
       </change>
       <change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index be0a609..a65ad13 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -433,7 +433,7 @@
               <value>stalled_cycles_frontend</value>
               <value>stalled_cycles_backend</value>
               <value>ref_cpu_cycles</value>
-              <value>cache_l1d</value>
+              <value>cache_l1dra</value>
             </choice>
           </attribute>
           <attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 1e0e74c..3da0e9b 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2189,15 +2189,15 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
 # define VIR_PERF_PARAM_REF_CPU_CYCLES "ref_cpu_cycles"

 /**
- * VIR_PERF_PARAM_CACHE_L1D:
+ * VIR_PERF_PARAM_CACHE_L1DRA:
  *
- * Macro for typed parameter name that represents cache_l1d
+ * Macro for typed parameter name that represents cache_l1dra
  * 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.
+ * read accesses for level 1 data cache by applications running
+ * on the platform. It corresponds to the "perf.cache_l1dra"
+ * field in the *Stats APIs.
  */
-# define VIR_PERF_PARAM_CACHE_L1D "cache_l1d"
+# define VIR_PERF_PARAM_CACHE_L1DRA "cache_l1dra"

 int virDomainGetPerfEvents(virDomainPtr dom,
                            virTypedParameterPtr *params,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 3023f30..fa39069 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11250,8 +11250,9 @@ 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.
+ *     "perf.cache_l1dra" - The count of total read accesses for level 1 data
+ *                          cache as unsigned long long. It is produced by
+ *                          cache_l1dra 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 42f9889..7e2ea96 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9877,7 +9877,7 @@ 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,
+                               VIR_PERF_PARAM_CACHE_L1DRA, VIR_TYPED_PARAM_BOOLEAN,
                                NULL) < 0)
         return -1;

diff --git a/src/util/virperf.c b/src/util/virperf.c
index 8554723..11e64df 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",
-              "cache_l1d");
+              "cache_l1dra");

 struct virPerfEvent {
     int type;
@@ -113,9 +113,11 @@ static struct virPerfEventAttr attrs[] = {
      .attrConfig = 0,
 # endif
     },
-    {.type = VIR_PERF_EVENT_CACHE_L1D,
+    {.type = VIR_PERF_EVENT_CACHE_L1DRA,
      .attrType = PERF_TYPE_HW_CACHE,
-     .attrConfig = PERF_COUNT_HW_CACHE_L1D},
+     .attrConfig = (PERF_COUNT_HW_CACHE_L1D) |
+                   (PERF_COUNT_HW_CACHE_OP_READ << 8) |
+                   (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16)},
 };
 typedef struct virPerfEventAttr *virPerfEventAttrPtr;

diff --git a/src/util/virperf.h b/src/util/virperf.h
index 4c562af..36ceb3a 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -47,7 +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_CACHE_L1DRA, /* Count of read accesses for level 1 data cache */

     VIR_PERF_EVENT_LAST
 } virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index d1418d0..9b01aef 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -26,7 +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'/>
+    <event name='cache_l1dra' enabled='yes'/>
   </perf>
   <devices>
   </devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index cfa7a24..798c02e 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -946,7 +946,7 @@ I<--perf> returns the statistics of all enabled perf events:
 "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.cache_l1d" - the count of level 1 data cache
+"perf.cache_l1dra" - the count of read accesses for level 1 data cache

 See the B<perf> command for more details about each event.

@@ -2311,8 +2311,8 @@ 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.
+  cache_l1dra - Provides the count of total read accesses for 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