[libvirt] [PATCH 3/9] perf: add page_faults software perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Fri Jan 27 11:01:02 UTC 2017
This patch adds support and documentation
for the page_faults perf event.
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 6 ++++++
docs/news.xml | 4 ++--
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 | 7 +++++--
src/util/virperf.h | 1 +
tests/genericxml2xmlindata/generic-perf.xml | 1 +
tools/virsh.pod | 3 +++
10 files changed, 33 insertions(+), 4 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 1ed5db7..2071eea 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1939,6 +1939,7 @@
<event name='ref_cpu_cycles' enabled='no'/>
<event name='cpu_clock' enabled='no'/>
<event name='task_clock' enabled='no'/>
+ <event name='page_faults' enabled='no'/>
</perf>
...
</pre>
@@ -2027,6 +2028,11 @@
<td>the count of task clock by applications running on the platform</td>
<td><code>perf.task_clock</code></td>
</tr>
+ <tr>
+ <td><code>page_faults</code></td>
+ <td>the count of page faults by applications running on the platform</td>
+ <td><code>perf.page_faults</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index 38373c0..14beed6 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -137,8 +137,8 @@
Add support to get the count of branch instructions
executed, branch misses, bus cycles, stalled frontend
cpu cycles, stalled backend cpu cycles, ref cpu cycles,
- cpu clock and task clock by applications running on the
- platform.
+ cpu clock, task clock and page faults by applications
+ running on the platform.
</description>
</change>
<change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 6ee2c6f..a7727e7 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -435,6 +435,7 @@
<value>ref_cpu_cycles</value>
<value>cpu_clock</value>
<value>task_clock</value>
+ <value>page_faults</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index f4f1c74..36619b5 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2208,6 +2208,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_TASK_CLOCK "task_clock"
+/**
+* VIR_PERF_PARAM_PAGE_FAULTS:
+*
+* Macro for typed parameter name that represents page_faults
+* perf event which can be used to measure the count of page
+* faults by applications running on the platform. It corresponds
+* to the "perf.page_faults" field in the *Stats APIs.
+*/
+# define VIR_PERF_PARAM_PAGE_FAULTS "page_faults"
+
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 6875848..a923acc 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11254,6 +11254,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* produced by the cpu_clock perf event.
* "perf.task_clock" - The count of task clock as unsigned long long. It is
* produced by the task_clock perf event.
+ * "perf.page_faults" - The count of page faults as unsigned long long. It is
+ * produced by the page_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 285156d..88f649e 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9551,6 +9551,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_REF_CPU_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CPU_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_TASK_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_PAGE_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index e19cfea..3282aca 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",
- "cpu_clock", "task_clock");
+ "cpu_clock", "task_clock", "page_faults");
struct virPerfEvent {
int type;
@@ -118,7 +118,10 @@ static struct virPerfEventAttr attrs[] = {
.attrConfig = PERF_COUNT_SW_CPU_CLOCK},
{.type = VIR_PERF_EVENT_TASK_CLOCK,
.attrType = PERF_TYPE_SOFTWARE,
- .attrConfig = PERF_COUNT_SW_TASK_CLOCK}
+ .attrConfig = PERF_COUNT_SW_TASK_CLOCK},
+ {.type = VIR_PERF_EVENT_PAGE_FAULTS,
+ .attrType = PERF_TYPE_SOFTWARE,
+ .attrConfig = PERF_COUNT_SW_PAGE_FAULTS},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index b9e8a75..fbc5ae3 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -49,6 +49,7 @@ typedef enum {
VIR_PERF_EVENT_REF_CPU_CYCLES, /* Count of ref cpu cycles */
VIR_PERF_EVENT_CPU_CLOCK, /* Count of cpu clock */
VIR_PERF_EVENT_TASK_CLOCK, /* Count of task clock */
+ VIR_PERF_EVENT_PAGE_FAULTS, /* Count of page faults */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index 5ebc0a2..3f27887 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -28,6 +28,7 @@
<event name='ref_cpu_cycles' enabled='yes'/>
<event name='cpu_clock' enabled='yes'/>
<event name='task_clock' enabled='yes'/>
+ <event name='page_faults' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 958e473..f7be74e 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -948,6 +948,7 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.ref_cpu_cycles" - the count of ref cpu cycles
"perf.cpu_clock" - the count of cpu clock
"perf.task_clock" - the count of task clock
+"perf.page_faults" - the count of page faults
See the B<perf> command for more details about each event.
@@ -2316,6 +2317,8 @@ B<Valid perf event names>
running on the platform.
task_clock - Provides the task clock time consumed by applications
running on the platform
+ page_faults - Provides the count of page faults 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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