Re: [libvirt] [PATCH v2 1/2] perf: add one more perf event support

With current perf framework, this patch adds support and documentation for branch instructions perf event. Signed-off-by: Nitesh Konkar <nitkon12(a)linux.vnet.ibm.com&gt; --- docs/formatdomain.html.in | 6 ++++++ docs/schemas/domaincommon.rng | 1 + include/libvirt/libvirt-domain.h | 10 ++++++++++ src/libvirt-domain.c | 3 +++ src/qemu/qemu_driver.c | 1 + src/util/virperf.c | 6 +++++- src/util/virperf.h | 2 ++ tests/genericxml2xmlindata/generic-perf.xml | 1 + tools/virsh.pod | 3 +++ 9 files changed, 32 insertions(+), 1 deletion(-) diff --git a/docs/formatdomain.html.in b/docs/formatdomain.html.in index 6bd02cc..ee8d312 100644 --- a/docs/formatdomain.html.in +++ b/docs/formatdomain.html.in @@ -1927,6 +1927,7 @@ &lt;event name='instructions' enabled='yes'/&gt; &lt;event name='cache_references' enabled='no'/&gt; &lt;event name='cache_misses' enabled='no'/&gt; + &lt;event name='branch_instructions' enabled='no'/&gt; &lt;/perf&gt; ... </pre> @@ -1972,6 +1973,11 @@ <td>the count of cache misses by applications running on the platform</td> <td><code>perf.cache_misses</code></td> </tr> + <tr> + <td><code>branch_instructions</code></td> + <td>the count of branch instructions by applications running on the platform</td> + <td><code>perf.branch_instructions</code></td> + </tr> </table> <h3><a name="elementsDevices">Devices</a></h3> diff --git a/docs/schemas/domaincommon.rng b/docs/schemas/domaincommon.rng index bb903ef..5fdc036 100644 --- a/docs/schemas/domaincommon.rng +++ b/docs/schemas/domaincommon.rng @@ -427,6 +427,7 @@ <value>instructions</value> <value>cache_references</value> <value>cache_misses</value> + <value>branch_instructions</value> </choice> </attribute> <attribute name="enabled"> diff --git a/include/libvirt/libvirt-domain.h b/include/libvirt/libvirt-domain.h index a8435ab..aad2541 100644 --- a/include/libvirt/libvirt-domain.h +++ b/include/libvirt/libvirt-domain.h @@ -2125,6 +2125,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats); */ # define VIR_PERF_PARAM_CPU_CYCLES "cpu_cycles" +/** + * VIR_PERF_PARAM_BRANCH_INSTRUCTIONS: + * + * Macro for typed parameter name that represents branch instructions

+ * perf event which can be used to measure the count of branch instructions + * by applications running on the platform. It corresponds to the + * "perf.branch_instructions" field in the *Stats APIs. + */ +# define VIR_PERF_PARAM_BRANCH_INSTRUCTIONS "branch_instructions" + int virDomainGetPerfEvents(virDomainPtr dom, virTypedParameterPtr *params, int *nparams, diff --git a/src/libvirt-domain.c b/src/libvirt-domain.c index ce199f0..fa28217 100644 --- a/src/libvirt-domain.c +++ b/src/libvirt-domain.c @@ -11213,6 +11213,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn, * "perf.cpu_cycles" - The count of cpu cycles (total/elapsed) as an * unsigned long long. It is produced by cpu_cycles * perf event. + * "perf.branch_instructions" - The count of branch instructions as unsigned + * long long. It is produced by branch_instructions + * 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 3517aa2..c7fad30 100644 --- a/src/qemu/qemu_driver.c +++ b/src/qemu/qemu_driver.c @@ -9852,6 +9852,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom, VIR_PERF_PARAM_INSTRUCTIONS, VIR_TYPED_PARAM_BOOLEAN, VIR_PERF_PARAM_CACHE_REFERENCES, VIR_TYPED_PARAM_BOOLEAN, VIR_PERF_PARAM_CACHE_MISSES, VIR_TYPED_PARAM_BOOLEAN, + VIR_PERF_PARAM_BRANCH_INSTRUCTIONS, VIR_TYPED_PARAM_BOOLEAN, NULL) < 0) return -1; diff --git a/src/util/virperf.c b/src/util/virperf.c index 5d57962..635faf1 100644 --- a/src/util/virperf.c +++ b/src/util/virperf.c @@ -40,7 +40,8 @@ VIR_LOG_INIT("util.perf"); VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST, "cmt", "mbmt", "mbml", "cpu_cycles", "instructions", - "cache_references", "cache_misses"); + "cache_references", "cache_misses", + "branch_instructions"); struct virPerfEvent { int type; @@ -85,6 +86,9 @@ static struct virPerfEventAttr attrs[] = { {.type = VIR_PERF_EVENT_CACHE_MISSES, .attrType = PERF_TYPE_HARDWARE, .attrConfig = PERF_COUNT_HW_CACHE_MISSES}, + {.type = VIR_PERF_EVENT_BRANCH_INSTRUCTIONS, + .attrType = PERF_TYPE_HARDWARE, + .attrConfig = PERF_COUNT_HW_BRANCH_INSTRUCTIONS}, }; typedef struct virPerfEventAttr *virPerfEventAttrPtr; diff --git a/src/util/virperf.h b/src/util/virperf.h index 3fca2d0..8ebc03c 100644 --- a/src/util/virperf.h +++ b/src/util/virperf.h @@ -36,6 +36,8 @@ typedef enum { VIR_PERF_EVENT_INSTRUCTIONS, /* Count of instructions for application */ VIR_PERF_EVENT_CACHE_REFERENCES, /* Cache hits by applications */ VIR_PERF_EVENT_CACHE_MISSES, /* Cache misses by applications */ + VIR_PERF_EVENT_BRANCH_INSTRUCTIONS, /* Count of branch instructions + for applications */ VIR_PERF_EVENT_LAST } virPerfEventType; diff --git a/tests/genericxml2xmlindata/generic-perf.xml b/tests/genericxml2xmlindata/generic-perf.xml index a914133..92e5847 100644 --- a/tests/genericxml2xmlindata/generic-perf.xml +++ b/tests/genericxml2xmlindata/generic-perf.xml @@ -20,6 +20,7 @@ <event name='instructions' enabled='yes'/> <event name='cache_references' enabled='no'/> <event name='cache_misses' enabled='no'/> + <event name='branch_instructions' enabled='yes'/> </perf> <devices> </devices> diff --git a/tools/virsh.pod b/tools/virsh.pod index 247d235..493465d 100644 --- a/tools/virsh.pod +++ b/tools/virsh.pod

@@ -2289,6 +2289,9 @@ B<Valid perf event names> (total/elapsed). May be used with instructions in order to get a cycles per instruction. + branch_instructions - Provides the count of branch instructions + executed by applications running on the + platform. B<Note>: The statistics can be retrieved using the B<domstats> command using the I<--perf> flag.