[libvirt] [PATCH 9/9] perf: add emulation_faults software perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Fri Jan 27 11:01:08 UTC 2017
This patch adds support and documentation
for the emulation_faults perf event.
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 7 +++++++
docs/news.xml | 5 +++--
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 | 5 ++++-
src/util/virperf.h | 1 +
tests/genericxml2xmlindata/generic-perf.xml | 1 +
tools/virsh.pod | 5 +++++
10 files changed, 36 insertions(+), 3 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 249cfe4..6a83a96 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1945,6 +1945,7 @@
<event name='page_faults_min' enabled='no'/>
<event name='page_faults_maj' enabled='no'/>
<event name='alignment_faults' enabled='no'/>
+ <event name='emulation_faults' enabled='no'/>
</perf>
...
</pre>
@@ -2066,6 +2067,12 @@
platform</td>
<td><code>perf.alignment_faults</code></td>
</tr>
+ <tr>
+ <td><code>emulation_faults</code></td>
+ <td>the count of emulation faults by applications running on the
+ platform</td>
+ <td><code>perf.emulation_faults</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index b148b38..e0e1c50 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -138,8 +138,9 @@
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, page faults maj and
- alignment faults by applications running on the platform.
+ cpu migrations, page faults min, page faults maj,
+ alignment faults and emulation faults by applications
+ running on the platform.
</description>
</change>
<change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 6782bf5..3781618 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -441,6 +441,7 @@
<value>page_faults_min</value>
<value>page_faults_maj</value>
<value>alignment_faults</value>
+ <value>emulation_faults</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 7523872..73974d9 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2268,6 +2268,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_ALIGNMENT_FAULTS "alignment_faults"
+/**
+ * VIR_PERF_PARAM_EMULATION_FAULTS:
+ *
+ * Macro for typed parameter name that represents emulation_faults
+ * perf event which can be used to measure the count of emulation
+ * faults by applications running on the platform. It corresponds
+ * to the "perf.emulation_faults" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_EMULATION_FAULTS "emulation_faults"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index bad9fea..36b7baa 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11271,6 +11271,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.alignment_faults" - The count of alignment faults as unsigned long
* long. It is produced by the alignment_faults
* perf event
+ * "perf.emulation_faults" - The count of emulation faults as unsigned long
+ * long. It is produced by the emulation_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 89394be..f47ae92 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9557,6 +9557,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
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,
+ VIR_PERF_PARAM_EMULATION_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index c25c57a..9a8f211 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -47,7 +47,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"cpu_clock", "task_clock", "page_faults",
"context_switches", "cpu_migrations",
"page_faults_min", "page_faults_maj",
- "alignment_faults");
+ "alignment_faults", "emulation_faults");
struct virPerfEvent {
int type;
@@ -140,6 +140,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_ALIGNMENT_FAULTS,
.attrType = PERF_TYPE_SOFTWARE,
.attrConfig = PERF_COUNT_SW_ALIGNMENT_FAULTS},
+ {.type = VIR_PERF_EVENT_EMULATION_FAULTS,
+ .attrType = PERF_TYPE_SOFTWARE,
+ .attrConfig = PERF_COUNT_SW_EMULATION_FAULTS},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 1c51e50..0ef0d67 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -55,6 +55,7 @@ typedef enum {
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_EMULATION_FAULTS, /* Count of emulation faults */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index b48f96c..457aea0 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -34,6 +34,7 @@
<event name='page_faults_min' enabled='yes'/>
<event name='page_faults_maj' enabled='yes'/>
<event name='alignment_faults' enabled='yes'/>
+ <event name='emulation_faults' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 1f1b9c9..19d02a5 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -954,6 +954,7 @@ I<--perf> returns the statistics of all enabled perf events:
"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
+"perf.emulation_faults" - the count of emulation faults
See the B<perf> command for more details about each event.
@@ -2340,6 +2341,10 @@ B<Valid perf event names>
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
+ emulation_faults - Provides the count of emulation faults, that is when
+ the kernel traps on unimplemented instrucions and
+ emulates them for user space, for 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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