[libvirt] [PATCH 5/9] perf: add cpu_migrations software perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Fri Jan 27 11:01:04 UTC 2017
This patch adds support and documentation
for the cpu_migrations 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 | 9 +++++++++
src/libvirt-domain.c | 5 ++++-
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 | 4 ++++
10 files changed, 33 insertions(+), 4 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 4ed6e02..f0efab1 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1941,6 +1941,7 @@
<event name='task_clock' enabled='no'/>
<event name='page_faults' enabled='no'/>
<event name='context_switches' enabled='no'/>
+ <event name='cpu_migrations' enabled='no'/>
</perf>
...
</pre>
@@ -2039,6 +2040,11 @@
<td>the count of context switches by applications running on the platform</td>
<td><code>perf.context_switches</code></td>
</tr>
+ <tr>
+ <td><code>cpu_migrations</code></td>
+ <td>the count of cpu migrations by applications running on the platform</td>
+ <td><code>perf.cpu_migrations</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index fb872f5..0489c42 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, task clock, page faults and context switches
- by applications running on the platform.
+ cpu clock, task clock, page faults, context switches and
+ cpu migrations by applications running on the platform.
</description>
</change>
<change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index e4e1358..5bd06cb 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -437,6 +437,7 @@
<value>task_clock</value>
<value>page_faults</value>
<value>context_switches</value>
+ <value>cpu_migrations</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index e71bfa7..b4abdb0 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2228,6 +2228,15 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_CONTEXT_SWITCHES "context_switches"
+/**
+ * VIR_PERF_PARAM_CPU_MIGRATIONS:
+ *
+ * Macro for typed parameter name that represents cpu_migrations
+ * perf event which can be used to measure the count of cpu
+ * migrations by applications running on the platform. It corresponds
+ * to the "perf.cpu_migrations" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CPU_MIGRATIONS "cpu_migrations"
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 42720f1..d063414 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11255,10 +11255,13 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "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.
+ * produced by the page_faults perf event.
* "perf.context_switches" - The count of context switches as unsigned long
* long. It is produced by the context_switches
* perf event.
+ * "perf.cpu_migrations" - The count of cpu migrations as unsigned long
+ * long. It is produced by the cpu_migrations
+ * 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 c579b61..3fb7032 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9553,6 +9553,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_TASK_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
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,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index c004061..4559845 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -45,7 +45,7 @@ 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");
+ "context_switches", "cpu_migrations");
struct virPerfEvent {
int type;
@@ -126,6 +126,9 @@ static struct virPerfEventAttr attrs[] = {
{.type = VIR_PERF_EVENT_CONTEXT_SWITCHES,
.attrType = PERF_TYPE_SOFTWARE,
.attrConfig = PERF_COUNT_SW_CONTEXT_SWITCHES},
+ {.type = VIR_PERF_EVENT_CPU_MIGRATIONS,
+ .attrType = PERF_TYPE_SOFTWARE,
+ .attrConfig = PERF_COUNT_SW_CPU_MIGRATIONS},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index b937d9a..b769ebc 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -51,6 +51,7 @@ typedef enum {
VIR_PERF_EVENT_TASK_CLOCK, /* Count of task clock */
VIR_PERF_EVENT_PAGE_FAULTS, /* Count of page faults */
VIR_PERF_EVENT_CONTEXT_SWITCHES, /* Count of context switches */
+ VIR_PERF_EVENT_CPU_MIGRATIONS, /* Count of cpu migrations */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index 29a2273..f856318 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -30,6 +30,7 @@
<event name='task_clock' enabled='yes'/>
<event name='page_faults' enabled='yes'/>
<event name='context_switches' enabled='yes'/>
+ <event name='cpu_migrations' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index d0bf016..a5e8ccd 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -950,6 +950,7 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.task_clock" - the count of task clock
"perf.page_faults" - the count of page faults
"perf.context_switches" - the count of context switches
+"perf.cpu_migrations" - the count of cpu migrations
See the B<perf> command for more details about each event.
@@ -2322,6 +2323,9 @@ B<Valid perf event names>
running on the platform
context_switches - Provides the count of context switches by applications
running on the platform
+ cpu_migrations - Provides the count of cpu migrations, that is, where the
+ process moved from one logical processor to another, 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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