[libvirt] [PATCH 5/7] perf: add cache_l1dpa perf event support
Nitesh Konkar
niteshkonkar.libvirt at gmail.com
Thu Jan 19 04:58:42 UTC 2017
This patch adds support and documentation for
a generalized hardware cache event named cache_l1dpa
perf event for measuring prefetch 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 | 5 ++++-
10 files changed, 37 insertions(+), 4 deletions(-)
diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in
index d5c2aad..245120d 100644
--- a/docs/formatdomain.html.in
+++ b/docs/formatdomain.html.in
@@ -1941,6 +1941,7 @@
<event name='cache_l1drm' enabled='no'/>
<event name='cache_l1dwa' enabled='no'/>
<event name='cache_l1dwm' enabled='no'/>
+ <event name='cache_l1dpa' enabled='no'/>
</perf>
...
</pre>
@@ -2043,6 +2044,12 @@
applications running on the platform</td>
<td><code>perf.cache_l1dwm</code></td>
</tr>
+ <tr>
+ <td><code>cache_l1dpa</code></td>
+ <td>the count of total prefetch accesses for level 1 data
+ cache by applications running on the platform</td>
+ <td><code>perf.cache_l1dpa</code></td>
+ </tr>
</table>
<h3><a name="elementsDevices">Devices</a></h3>
diff --git a/docs/news.xml b/docs/news.xml
index eb2e815..1f362e2 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, cache l1drm, cache l1dwa and cache l1dwm by
- applications running on the platform.
+ cache l1dra, cache l1drm, cache l1dwa, cache l1dwm,
+ cache l1dpa by applications running on the platform.
</description>
</change>
<change>
diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng
index 91ad636..83a205a 100644
--- a/docs/schemas/domaincommon.rng
+++ b/docs/schemas/domaincommon.rng
@@ -437,6 +437,7 @@
<value>cache_l1drm</value>
<value>cache_l1dwa</value>
<value>cache_l1dwm</value>
+ <value>cache_l1dpa</value>
</choice>
</attribute>
<attribute name="enabled">
diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h
index 0d8d731..9db4969 100644
--- a/include/libvirt/libvirt-domain.h
+++ b/include/libvirt/libvirt-domain.h
@@ -2232,6 +2232,17 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
*/
# define VIR_PERF_PARAM_CACHE_L1DWM "cache_l1dwm"
+/*
+ * VIR_PERF_PARAM_CACHE_L1DPA:
+ *
+ *Macro for typed parameter name that represents cache_l1dpa
+ *perf event which can be used to measure the count of total
+ *prefetch accesses for level 1 data cache by applications
+ *running on the platform. It corresponds to the
+ *"perf.cache_l1dpa" field in the *Stats APIs.
+ */
+# define VIR_PERF_PARAM_CACHE_L1DPA "cache_l1dpa"
+
int virDomainGetPerfEvents(virDomainPtr dom,
virTypedParameterPtr *params,
int *nparams,
diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c
index 3a5a776..089d3f5 100644
--- a/src/libvirt-domain.c
+++ b/src/libvirt-domain.c
@@ -11262,6 +11262,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
* "perf.cache_l1dwm" - The count of total write misses for level 1 data
* cache as unsigned long long. It is produced by
* cache_l1dwm perf event.
+ * "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.
*
* 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 205d2d2..8acb706 100644
--- a/src/qemu/qemu_driver.c
+++ b/src/qemu/qemu_driver.c
@@ -9881,6 +9881,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
VIR_PERF_PARAM_CACHE_L1DRM, VIR_TYPED_PARAM_BOOLEAN,
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,
NULL) < 0)
return -1;
diff --git a/src/util/virperf.c b/src/util/virperf.c
index 384a3e1..df2a91a 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_l1dwm", "cache_l1dpa");
struct virPerfEvent {
int type;
@@ -134,6 +134,11 @@ static struct virPerfEventAttr attrs[] = {
.attrConfig = (PERF_COUNT_HW_CACHE_L1D) |
(PERF_COUNT_HW_CACHE_OP_WRITE << 8) |
(PERF_COUNT_HW_CACHE_RESULT_MISS << 16)},
+ {.type = VIR_PERF_EVENT_CACHE_L1DPA,
+ .attrType = PERF_TYPE_HW_CACHE,
+ .attrConfig = (PERF_COUNT_HW_CACHE_L1D) |
+ (PERF_COUNT_HW_CACHE_OP_PREFETCH << 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 13967d8..78c8557 100644
--- a/src/util/virperf.h
+++ b/src/util/virperf.h
@@ -51,6 +51,7 @@ typedef enum {
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_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_LAST
} virPerfEventType;
diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml
index 4351fb2..a575f89 100644
--- a/tests/genericxml2xmlindata/generic-perf.xml
+++ b/tests/genericxml2xmlindata/generic-perf.xml
@@ -30,6 +30,7 @@
<event name='cache_l1drm' enabled='yes'/>
<event name='cache_l1dwa' enabled='yes'/>
<event name='cache_l1dwm' enabled='yes'/>
+ <event name='cache_l1dpa' enabled='yes'/>
</perf>
<devices>
</devices>
diff --git a/tools/virsh.pod b/tools/virsh.pod
index de7856b..c599aa5 100644
--- a/tools/virsh.pod
+++ b/tools/virsh.pod
@@ -949,7 +949,8 @@ I<--perf> returns the statistics of all enabled perf events:
"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,
-"perf.cache_l1dwm" - the count of write misses 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
See the B<perf> command for more details about each event.
@@ -2322,6 +2323,8 @@ B<Valid perf event names>
data cache by applications running on the platform.
cache_l1dwm - Provides the count of total write misses for level 1
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.
B<Note>: The statistics can be retrieved using the B<domstats> command using
the I<--perf> flag.
--
1.9.3
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