[libvirt] [PATCH 3/7] perf: add cache_l1dwa perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Thu Jan 19 04:58:40 UTC 2017
This patch adds support and documentation for
a generalized hardware cache event named cache_l1dwa
perf event for measuring write accesses on level 1
data cache
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 7 +++++++
docs/news.xml | 4 ++--
docs/schemas/domaincommon.rng | 1 +
include/libvirt/libvirt-domain.h | 11 +++++++++++
src/libvirt-domain.c | 3 +++
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, 36 insertions(+), 3 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 9db6d38..4c24ead 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1939,6 +1939,7 @@
<event name='ref_cpu_cycles' enabled='no'/>
<event name='cache_l1dra' enabled='no'/>
<event name='cache_l1drm' enabled='no'/>
+ <event name='cache_l1dwa' enabled='no'/>
</perf>
...
</pre>
@@ -2029,6 +2030,12 @@
applications running on the platform</td>
<td><code>perf.cache_l1drm</code></td>
</tr>
+ <tr>
+ <td><code>cache_l1dwa</code></td>
+ <td>the count of total write accesses for level 1 data cache by
+ applications running on the platform</td>
+ <td><code>perf.cache_l1dwa</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index fe83ce4..129cbc9 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -107,8 +107,8 @@
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,
- cache l1dra and cache l1drm by applications running on
- the platform.
+ cache l1dra, cache l1drm and cache l1dwa by applications
+ running on the platform.
</description>
</change>
<change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 6a7c83c..9ad5937 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -435,6 +435,7 @@
<value>ref_cpu_cycles</value>
<value>cache_l1dra</value>
<value>cache_l1drm</value>
+ <value>cache_l1dwa</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index abf0e14..b02eb49 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2210,6 +2210,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_CACHE_L1DRM "cache_l1drm"
+/*
+ * VIR_PERF_PARAM_CACHE_L1DWA:
+ *
+ * Macro for typed parameter name that represents cache_l1dwa
+ * perf event which can be used to measure the count of total
+ * write accesses for level 1 data cache by applications running
+ * on the platform. It corresponds to the "perf.cache_l1dwa"
+ * field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CACHE_L1DWA "cache_l1dwa"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 7183905..92e8bf1 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11256,6 +11256,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.cache_l1drm" - The count of total read misses for level 1 data
* cache as unsigned long long. It is produced by
* cache_l1drm perf event.
+ * "perf.cache_l1dwa" - The count of total write accesses for level 1 data
+ * cache as unsigned long long. It is produced by
+ * cache_l1dwa 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 da50f95..c2f55d3 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9879,6 +9879,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_REF_CPU_CYCLES, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CACHE_L1DRA, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CACHE_L1DRM, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_CACHE_L1DWA, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index 4b9fc9a..c4cea33 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",
- "cache_l1dra", "cache_l1drm");
+ "cache_l1dra", "cache_l1drm", "cache_l1dwa");
struct virPerfEvent {
int type;
@@ -123,6 +123,11 @@ static struct virPerfEventAttr attrs[] = {
.attrConfig = (PERF_COUNT_HW_CACHE_L1D) |
(PERF_COUNT_HW_CACHE_OP_READ << 8) |
(PERF_COUNT_HW_CACHE_RESULT_MISS << 16)},
+ {.type = VIR_PERF_EVENT_CACHE_L1DWA,
+ .attrType = PERF_TYPE_HW_CACHE,
+ .attrConfig = (PERF_COUNT_HW_CACHE_L1D) |
+ (PERF_COUNT_HW_CACHE_OP_WRITE << 8) |
+ (PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16)},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 37058b0..5671ec7 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_CACHE_L1DRA, /* Count of read accesses for level 1 data cache */
VIR_PERF_EVENT_CACHE_L1DRM, /* Count of read misses for level 1 data cache */
+ VIR_PERF_EVENT_CACHE_L1DWA, /* Count of write accesses for level 1 data cache */
VIR_PERF_EVENT_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index bb8a085..e9d29a1 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='cache_l1dra' enabled='yes'/>
<event name='cache_l1drm' enabled='yes'/>
+ <event name='cache_l1dwa' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index c1bdbdd..c06c96b 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.cache_l1dra" - the count of read accesses for level 1 data cache,
"perf.cache_l1drm" - the count of read misses for level 1 data cache
+"perf.cache_l1dwa" - the count of write accesses for level 1 data cache
See the B<perf> command for more details about each event.
@@ -2316,6 +2317,8 @@ B<Valid perf event names>
data cache by applications running on the platform.
cache_l1drm - Provides the count of total read misses for level 1
data cache by applications running on the platform.
+ cache_l1dwa - Provides the count of total write accesses for 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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