[libvirt] [PATCH 1/2] perf: add cache_l1d perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Fri Jan 6 12:55:41 UTC 2017
This patch adds support and documentation for
a generalized hardware cache event called cache_l1d
perf event.
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 7 +++++++
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 | 6 +++++-
src/util/virperf.h | 1 +
tests/genericxml2xmlindata/generic-perf.xml | 1 +
tools/virsh.pod | 5 ++++-
9 files changed, 33 insertions(+), 2 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index f7bef51..e192b77 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1937,6 +1937,7 @@
<event name='stalled_cycles_frontend' enabled='no'/>
<event name='stalled_cycles_backend' enabled='no'/>
<event name='ref_cpu_cycles' enabled='no'/>
+ <event name='cache_l1d' enabled='no'/>
</perf>
...
</pre>
@@ -2015,6 +2016,12 @@
by applications running on the platform</td>
<td><code>perf.ref_cpu_cycles</code></td>
</tr>
+ <tr>
+ <td><code>cache_l1d</code></td>
+ <td>the count of total level 1 data cache by applications running on
+ the platform</td>
+ <td><code>perf.cache_l1d</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 4d76315..be0a609 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -433,6 +433,7 @@
<value>stalled_cycles_frontend</value>
<value>stalled_cycles_backend</value>
<value>ref_cpu_cycles</value>
+ <value>cache_l1d</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 6362947..479d417 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2188,6 +2188,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_REF_CPU_CYCLES "ref_cpu_cycles"
+/**
+ * VIR_PERF_PARAM_CACHE_L1D:
+ *
+ * Macro for typed parameter name that represents cache_l1d
+ * perf event which can be used to measure the count of total
+ * level 1 data cache by applications running on the platform.
+ * It corresponds to the "perf.cache_l1d" field in the
+ * *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CACHE_L1D "cache_l1d"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 5b3e842..3023f30 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11250,6 +11250,8 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* CPU frequency scaling by applications running
* as unsigned long long. It is produced by the
* ref_cpu_cycles perf event.
+ * "perf.cache_l1d" - The count of total level 1 data cache as unsigned
+ * long long. It is produced by cache_l1d 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 b359e77..80db495 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9859,6 +9859,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_STALLED_CYCLES_FRONTEND, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_STALLED_CYCLES_BACKEND, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_REF_CPU_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_CACHE_L1D, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index f64692b..8554723 100644
--- a/src/util/virperf.c
+++ b/src/util/virperf.c
@@ -43,7 +43,8 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
"cache_references", "cache_misses",
"branch_instructions", "branch_misses",
"bus_cycles", "stalled_cycles_frontend",
- "stalled_cycles_backend", "ref_cpu_cycles");
+ "stalled_cycles_backend", "ref_cpu_cycles",
+ "cache_l1d");
struct virPerfEvent {
int type;
@@ -112,6 +113,9 @@ static struct virPerfEventAttr attrs[] = {
.attrConfig = 0,
# endif
},
+ {.type = VIR_PERF_EVENT_CACHE_L1D,
+ .attrType = PERF_TYPE_HW_CACHE,
+ .attrConfig = PERF_COUNT_HW_CACHE_L1D},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 1f43c92..4c562af 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -47,6 +47,7 @@ typedef enum {
the backend of the instruction
processor pipeline */
VIR_PERF_EVENT_REF_CPU_CYCLES, /* Count of ref cpu cycles */
+ VIR_PERF_EVENT_CACHE_L1D, /* Count of level 1 data cache*/
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index 437cd65..d1418d0 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -26,6 +26,7 @@
<event name='stalled_cycles_frontend' enabled='yes'/>
<event name='stalled_cycles_backend' enabled='yes'/>
<event name='ref_cpu_cycles' enabled='yes'/>
+ <event name='cache_l1d' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index ef91223..e039db5 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -951,7 +951,8 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.bus_cycles" - the count of bus cycles,
"perf.stalled_cycles_frontend" - the count of stalled frontend cpu cycles,
"perf.stalled_cycles_backend" - the count of stalled backend cpu cycles,
-"perf.ref_cpu_cycles" - the count of ref cpu cycles
+"perf.ref_cpu_cycles" - the count of ref cpu cycles,
+"perf.cache_l1d" - the count of level 1 data cache
See the B<perf> command for more details about each event.
@@ -2316,6 +2317,8 @@ B<Valid perf event names>
ref_cpu_cycles - Provides the count of total cpu cycles
not affected by CPU frequency scaling by
applications running on the platform.
+ cache_l1d - Provides the count of total level 1 data cache
+ 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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