[libvirt] [PATCH v2 1/2] perf: add one more perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Wed Dec 7 10:57:36 UTC 2016
With current perf framework, this patch adds support and documentation
for branch instructions perf event.
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 6 ++++++
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 | 2 ++
tests/genericxml2xmlindata/generic-perf.xml | 1 +
tools/virsh.pod | 3 +++
9 files changed, 32 insertions(+), 1 deletion(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 6bd02cc..ee8d312 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1927,6 +1927,7 @@
<event name='instructions' enabled='yes'/>
<event name='cache_references' enabled='no'/>
<event name='cache_misses' enabled='no'/>
+ <event name='branch_instructions' enabled='no'/>
</perf>
...
</pre>
@@ -1972,6 +1973,11 @@
<td>the count of cache misses by applications running on the platform</td>
<td><code>perf.cache_misses</code></td>
</tr>
+ <tr>
+ <td><code>branch_instructions</code></td>
+ <td>the count of branch instructions by applications running on the platform</td>
+ <td><code>perf.branch_instructions</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index bb903ef..5fdc036 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -427,6 +427,7 @@
<value>instructions</value>
<value>cache_references</value>
<value>cache_misses</value>
+ <value>branch_instructions</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index a8435ab..aad2541 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2125,6 +2125,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_CPU_CYCLES "cpu_cycles"
+/**
+ * VIR_PERF_PARAM_BRANCH_INSTRUCTIONS:
+ *
+ * Macro for typed parameter name that represents branch instructions
+ * perf event which can be used to measure the count of branch instructions
+ * by applications running on the platform. It corresponds to the
+ * "perf.branch_instructions" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_BRANCH_INSTRUCTIONS "branch_instructions"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index ce199f0..fa28217 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11213,6 +11213,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.cpu_cycles" - The count of cpu cycles (total/elapsed) as an
* unsigned long long. It is produced by cpu_cycles
* perf event.
+ * "perf.branch_instructions" - The count of branch instructions as unsigned
+ * long long. It is produced by branch_instructions
+ * 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 3517aa2..c7fad30 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9852,6 +9852,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_INSTRUCTIONS, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CACHE_REFERENCES, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CACHE_MISSES, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_BRANCH_INSTRUCTIONS, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index 5d57962..635faf1 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -40,7 +40,8 @@ VIR_LOG_INIT("util.perf");
VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"cmt", "mbmt", "mbml",
"cpu_cycles", "instructions",
- "cache_references", "cache_misses");
+ "cache_references", "cache_misses",
+ "branch_instructions");
struct virPerfEvent {
int type;
@@ -85,6 +86,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_CACHE_MISSES,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_CACHE_MISSES},
+ {.type = VIR_PERF_EVENT_BRANCH_INSTRUCTIONS,
+ .attrType = PERF_TYPE_HARDWARE,
+ .attrConfig = PERF_COUNT_HW_BRANCH_INSTRUCTIONS},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 3fca2d0..8ebc03c 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -36,6 +36,8 @@ typedef enum {
VIR_PERF_EVENT_INSTRUCTIONS, /* Count of instructions for application */
VIR_PERF_EVENT_CACHE_REFERENCES, /* Cache hits by applications */
VIR_PERF_EVENT_CACHE_MISSES, /* Cache misses by applications */
+ VIR_PERF_EVENT_BRANCH_INSTRUCTIONS, /* Count of branch instructions
+ for applications */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index a914133..92e5847 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -20,6 +20,7 @@
<event name='instructions' enabled='yes'/>
<event name='cache_references' enabled='no'/>
<event name='cache_misses' enabled='no'/>
+ <event name='branch_instructions' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 247d235..493465d 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -2289,6 +2289,9 @@ B<Valid perf event names>
(total/elapsed). May be used with
instructions in order to get a cycles
per instruction.
+ branch_instructions - Provides the count of branch instructions
+ executed 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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