[libvirt] [PATCH 6/7] perf: add cache_l1dpm perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Thu Jan 19 04:58:43 UTC 2017
This patch adds support and documentation for
a generalized hardware cache event named cache_l1dpm
perf event for measuring prefetch misses on level 1
data cache
Signed-off-by: Nitesh Konkar <nitkon12 at linux.vnet.ibm.com>
---
docs/formatdomain.html.in | 7 +++++++
docs/news.xml | 3 ++-
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(+), 2 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index 245120d..179efe3 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1942,6 +1942,7 @@
<event name='cache_l1dwa' enabled='no'/>
<event name='cache_l1dwm' enabled='no'/>
<event name='cache_l1dpa' enabled='no'/>
+ <event name='cache_l1dpm' enabled='no'/>
</perf>
...
</pre>
@@ -2050,6 +2051,12 @@
cache by applications running on the platform</td>
<td><code>perf.cache_l1dpa</code></td>
</tr>
+ <tr>
+ <td><code>cache_l1dpm</code></td>
+ <td>the count of total prefetch misses for level 1 data
+ cache by applications running on the platform</td>
+ <td><code>perf.cache_l1dpm</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index 1f362e2..954c2af 100644
--- a/docs/news.xml
+++ b/docs/news.xml
@@ -108,7 +108,8 @@
executed, branch misses, bus cycles, stalled frontend
cpu cycles, stalled backend cpu cycles, ref cpu cycles,
cache l1dra, cache l1drm, cache l1dwa, cache l1dwm,
- cache l1dpa by applications running on the platform.
+ cache l1dpa and cache l1dpm by applications running on
+ the platform.
</description>
</change>
<change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 83a205a..05d3579 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -438,6 +438,7 @@
<value>cache_l1dwa</value>
<value>cache_l1dwm</value>
<value>cache_l1dpa</value>
+ <value>cache_l1dpm</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 9db4969..6c84c98 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2243,6 +2243,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_CACHE_L1DPA "cache_l1dpa"
+/*
+ * VIR_PERF_PARAM_CACHE_L1DPM:
+ *
+ *Macro for typed parameter name that represents cache_l1dpm
+ *perf event which can be used to measure the count of total
+ *prefetch misses for level 1 data cache by applications
+ *running on the platform. It corresponds to the
+ *"perf.cache_l1dpm" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CACHE_L1DPM "cache_l1dpm"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 089d3f5..1f34175 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11265,6 +11265,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.cache_l1dpa" - The count of total prefetch accesses for level 1
* data cache as unsigned long long. It is produced by
* cache_l1dpa perf event.
+ * "perf.cache_l1dpm" - The count of total prefetch misses for level 1
+ * data cache as unsigned long long. It is produced by
+ * cache_l1dpm 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 8acb706..356bc38 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9882,6 +9882,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_CACHE_L1DWA, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CACHE_L1DWM, VIR_TYPED_PARAM_BOOLEAN,
VIR_PERF_PARAM_CACHE_L1DPA, VIR_TYPED_PARAM_BOOLEAN,
+ VIR_PERF_PARAM_CACHE_L1DPM, VIR_TYPED_PARAM_BOOLEAN,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index df2a91a..788b817 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",
"cache_l1dra", "cache_l1drm", "cache_l1dwa",
- "cache_l1dwm", "cache_l1dpa");
+ "cache_l1dwm", "cache_l1dpa", "cache_l1dpm");
struct virPerfEvent {
int type;
@@ -139,6 +139,11 @@ static struct virPerfEventAttr attrs[] = {
.attrConfig = (PERF_COUNT_HW_CACHE_L1D) |
(PERF_COUNT_HW_CACHE_OP_PREFETCH << 8) |
(PERF_COUNT_HW_CACHE_RESULT_ACCESS << 16)},
+ {.type = VIR_PERF_EVENT_CACHE_L1DPM,
+ .attrType = PERF_TYPE_HW_CACHE,
+ .attrConfig = (PERF_COUNT_HW_CACHE_L1D) |
+ (PERF_COUNT_HW_CACHE_OP_PREFETCH << 8) |
+ (PERF_COUNT_HW_CACHE_RESULT_MISS << 16)},
};
typedef struct virPerfEventAttr *virPerfEventAttrPtr;
diff --git a/src/util/virperf.h b/src/util/virperf.h
index 78c8557..1ec5c3a 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -52,6 +52,7 @@ typedef enum {
VIR_PERF_EVENT_CACHE_L1DWA, /* Count of write accesses for level 1 data cache */
VIR_PERF_EVENT_CACHE_L1DWM, /* Count of write misses for level 1 data cache */
VIR_PERF_EVENT_CACHE_L1DPA, /* Count of prefetch accesses for level 1 data cache */
+ VIR_PERF_EVENT_CACHE_L1DPM, /* Count of prefetch misses 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 a575f89..875d092 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -31,6 +31,7 @@
<event name='cache_l1dwa' enabled='yes'/>
<event name='cache_l1dwm' enabled='yes'/>
<event name='cache_l1dpa' enabled='yes'/>
+ <event name='cache_l1dpm' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index c599aa5..467a7d6 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -951,6 +951,7 @@ I<--perf> returns the statistics of all enabled perf events:
"perf.cache_l1dwa" - the count of write accesses for level 1 data cache,
"perf.cache_l1dwm" - the count of write misses for level 1 data cache,
"perf.cache_l1dpa" - the count of prefetch accesses for level 1 data cache
+"perf.cache_l1dpm" - the count of prefetch misses for level 1 data cache
See the B<perf> command for more details about each event.
@@ -2325,6 +2326,8 @@ B<Valid perf event names>
data cache by applications running on the platform.
cache_l1dpa - Provides the count of total prefetch accesses for
level 1 data cache by applications running on the platform.
+ cache_l1dpm - Provides the count of total prefetch misses 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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