[libvirt] [PATCH v2 06/10] perf: add page_faults_min software perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Thu Feb 23 14:55:35 UTC 2017
This patch adds support and documentation
for the page_faults_min perf event.
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 9 +++++++++
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 | 1 +
tests/genericxml2xmlindata/generic-perf.xml | 1 +
tools/virsh.pod | 3 +++
9 files changed, 34 insertions(+), 1 deletion(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 49f1e5e..0d2834b 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1941,6 +1941,7 @@
<event name='page_faults' enabled='no'/>
<event name='context_switches' enabled='no'/>
<event name='cpu_migrations' enabled='no'/>
+ <event name='page_faults_min' enabled='no'/>
</perf>
...
</pre>
@@ -2053,6 +2054,14 @@
applications running on the platform</td>
<td><code>perf.cpu_migrations</code></td>
</tr>
+ <tr>
+ <td><code>page_faults_min</code></td>
+ <td>the count of minor page faults, that is, where the
+ page was present in the page cache, and therefore
+ the fault avoided loading it from storage, by
+ applications running on the platform</td>
+ <td><code>perf.page_faults_min</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index a14b18a..b8914d5 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -438,6 +438,7 @@
<value>page_faults</value>
<value>context_switches</value>
<value>cpu_migrations</value>
+ <value>page_faults_min</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 7e24f50..b7e6c71 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2240,6 +2240,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_CPU_MIGRATIONS "cpu_migrations"
+/**
+ * VIR_PERF_PARAM_PAGE_FAULTS_MIN:
+ *
+ * Macro for typed parameter name that represents page_faults_min
+ * perf event which can be used to measure the count of minor page
+ * faults by applications running on the platform. It corresponds
+ * to the "perf.page_faults_min" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_PAGE_FAULTS_MIN "page_faults_min"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 27be5cd..2e95532 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11263,6 +11263,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* processor to another, as unsigned long
* long. It is produced by the cpu_migrations
* perf event.
+ * "perf.page_faults_min" - The count of minor page faults as unsigned
+ * long long. It is produced by the
+ * page_faults_min 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 640d06b..8523e1f 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9574,6 +9574,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_PAGE_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CONTEXT_SWITCHES, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CPU_MIGRATIONS, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_PAGE_FAULTS_MIN, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index 0127c82..9e41df9 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -45,7 +45,8 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"bus_cycles", "stalled_cycles_frontend",
"stalled_cycles_backend", "ref_cpu_cycles",
"cpu_clock", "task_clock", "page_faults",
- "context_switches", "cpu_migrations");
+ "context_switches", "cpu_migrations",
+ "page_faults_min");
struct virPerfEvent {
int type;
@@ -129,6 +130,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_CPU_MIGRATIONS,
.attrType = PERF_TYPE_SOFTWARE,
.attrConfig = PERF_COUNT_SW_CPU_MIGRATIONS},
+ {.type = VIR_PERF_EVENT_PAGE_FAULTS_MIN,
+ .attrType = PERF_TYPE_SOFTWARE,
+ .attrConfig = PERF_COUNT_SW_PAGE_FAULTS_MIN},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 90ae007..aa90273 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -52,6 +52,7 @@ typedef enum {
VIR_PERF_EVENT_PAGE_FAULTS, /* Count of total page faults */
VIR_PERF_EVENT_CONTEXT_SWITCHES, /* Count of context switches */
VIR_PERF_EVENT_CPU_MIGRATIONS, /* Count of cpu migrations */
+ VIR_PERF_EVENT_PAGE_FAULTS_MIN, /* Count of minor page faults */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index f856318..62ad973 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -31,6 +31,7 @@
<event name='page_faults' enabled='yes'/>
<event name='context_switches' enabled='yes'/>
<event name='cpu_migrations' enabled='yes'/>
+ <event name='page_faults_min' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index 65532b9..6194aaf 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -969,6 +969,7 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.page_faults" - the count of page faults
"perf.context_switches" - the count of context switches.
"perf.cpu_migrations" - the count of cpu migrations
+ "perf.page_faults_min" - the count of minor page faults
See the B<perf> command for more details about each event.
@@ -2348,6 +2349,8 @@ B<Valid perf event names>
by applications running on the platform
cpu_migrations - Provides the count cpu migrations by
applications running on the platform
+ page_faults_min - Provides the count minor 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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