[libvirt] [PATCH] perf: add branch_misses perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Sun Dec 11 13:30:11 UTC 2016
This patch adds support and documentation
for the branch_misses 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 | 4 ++++
src/qemu/qemu_driver.c | 1 +
src/util/virperf.c | 5 ++++-
src/util/virperf.h | 1 +
tests/genericxml2xmlindata/generic-perf.xml | 1 +
tools/virsh.pod | 5 ++++-
9 files changed, 32 insertions(+), 2 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 9218eec..086af55 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1928,6 +1928,7 @@
<event name='cache_references' enabled='no'/>
<event name='cache_misses' enabled='no'/>
<event name='branch_instructions' enabled='no'/>
+ <event name='branch_misses' enabled='no'/>
</perf>
...
</pre>
@@ -1978,6 +1979,11 @@
<td>the count of branch instructions by applications running on the platform</td>
<td><code>perf.branch_instructions</code></td>
</tr>
+ <tr>
+ <td><code>branch_misses</code></td>
+ <td>the count of branch misses by applications running on the platform</td>
+ <td><code>perf.branch_misses</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index c004233..bf8818d 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -428,6 +428,7 @@
<value>cache_references</value>
<value>cache_misses</value>
<value>branch_instructions</value>
+ <value>branch_misses</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index f43c976..3290b10 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2135,6 +2135,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_BRANCH_INSTRUCTIONS "branch_instructions"
+/**
+ * VIR_PERF_PARAM_BRANCH_MISSES:
+ *
+ * Macro for typed parameter name that represents branch_misses
+ * perf event which can be used to measure the count of branch misses
+ * by applications running on the platform. It corresponds to the
+ * "perf.branch_misses" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_BRANCH_MISSES "branch_misses"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 6481abf..a91f432 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11229,6 +11229,10 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.branch_instructions" - The count of branch instructions as
* unsigned long long. It is produced by
* branch_instructions perf event.
+ * "perf.branch_misses" - The count of branch misses as
+ * unsigned long long. It is produced by
+ * branch_misses 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 842de0a..0f3a283 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9853,6 +9853,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
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,
+ VIR_PERF_PARAM_BRANCH_MISSES, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index 635faf1..7f630da 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -41,7 +41,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"cmt", "mbmt", "mbml",
"cpu_cycles", "instructions",
"cache_references", "cache_misses",
- "branch_instructions");
+ "branch_instructions", "branch_misses");
struct virPerfEvent {
int type;
@@ -89,6 +89,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_BRANCH_INSTRUCTIONS,
.attrType = PERF_TYPE_HARDWARE,
.attrConfig = PERF_COUNT_HW_BRANCH_INSTRUCTIONS},
+ {.type = VIR_PERF_EVENT_BRANCH_MISSES,
+ .attrType = PERF_TYPE_HARDWARE,
+ .attrConfig = PERF_COUNT_HW_BRANCH_MISSES},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 8ebc03c..7049a5b 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -38,6 +38,7 @@ typedef enum {
VIR_PERF_EVENT_CACHE_MISSES, /* Cache misses by applications */
VIR_PERF_EVENT_BRANCH_INSTRUCTIONS, /* Count of branch instructions
for applications */
+ VIR_PERF_EVENT_BRANCH_MISSES, /* Count of branch misses for applications */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index 92e5847..a1e4e1c 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -21,6 +21,7 @@
<event name='cache_references' enabled='no'/>
<event name='cache_misses' enabled='no'/>
<event name='branch_instructions' enabled='yes'/>
+ <event name='branch_misses' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 869062a..74c05c9 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -946,7 +946,8 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.instructions" - the count of instructions,
"perf.cache_references" - the count of cache hits,
"perf.cache_misses" - the count of caches misses,
-"perf.branch_instructions" - the count of application branch instructions
+"perf.branch_instructions" - the count of branch instructions,
+"perf.branch_misses" - the count of branch misses
See the B<perf> command for more details about each event.
@@ -2296,6 +2297,8 @@ B<Valid perf event names>
branch_instructions - Provides the count of branch instructions
executed by applications running on the
platform.
+ branch_misses - Provides the count of branch misses 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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