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perf: add cpu_migrations software perf event support
This patch adds support and documentation for the cpu_migrations perf event. Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>
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@ -1951,6 +1951,7 @@
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<event name='task_clock' enabled='no'/>
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<event name='task_clock' enabled='no'/>
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<event name='page_faults' enabled='no'/>
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<event name='page_faults' enabled='no'/>
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<event name='context_switches' enabled='no'/>
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<event name='context_switches' enabled='no'/>
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<event name='cpu_migrations' enabled='no'/>
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</perf>
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</perf>
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...
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...
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</pre>
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</pre>
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@ -2056,6 +2057,13 @@
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the platform</td>
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the platform</td>
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<td><code>perf.context_switches</code></td>
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<td><code>perf.context_switches</code></td>
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</tr>
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</tr>
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<tr>
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<td><code>cpu_migrations</code></td>
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<td>the count of cpu migrations, that is, where the process
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moved from one logical processor to another, by
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applications running on the platform</td>
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<td><code>perf.cpu_migrations</code></td>
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</tr>
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</table>
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</table>
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<h3><a name="elementsDevices">Devices</a></h3>
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<h3><a name="elementsDevices">Devices</a></h3>
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@ -437,6 +437,7 @@
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<value>task_clock</value>
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<value>task_clock</value>
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<value>page_faults</value>
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<value>page_faults</value>
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<value>context_switches</value>
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<value>context_switches</value>
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<value>cpu_migrations</value>
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</choice>
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</choice>
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</attribute>
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</attribute>
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<attribute name="enabled">
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<attribute name="enabled">
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@ -2230,6 +2230,15 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
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*/
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*/
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# define VIR_PERF_PARAM_CONTEXT_SWITCHES "context_switches"
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# define VIR_PERF_PARAM_CONTEXT_SWITCHES "context_switches"
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/**
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* VIR_PERF_PARAM_CPU_MIGRATIONS:
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*
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* Macro for typed parameter name that represents cpu_migrations
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* perf event which can be used to measure the count of cpu
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* migrations by applications running on the platform. It corresponds
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* to the "perf.cpu_migrations" field in the *Stats APIs.
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*/
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# define VIR_PERF_PARAM_CPU_MIGRATIONS "cpu_migrations"
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int virDomainGetPerfEvents(virDomainPtr dom,
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int virDomainGetPerfEvents(virDomainPtr dom,
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virTypedParameterPtr *params,
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virTypedParameterPtr *params,
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@ -11259,6 +11259,10 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
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* "perf.context_switches" - The count of context switches as unsigned long
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* "perf.context_switches" - The count of context switches as unsigned long
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* long. It is produced by the context_switches
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* long. It is produced by the context_switches
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* perf event.
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* perf event.
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* "perf.cpu_migrations" - The count of cpu migrations, from one logical
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* processor to another, as unsigned long
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* long. It is produced by the cpu_migrations
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* perf event.
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*
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*
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* Note that entire stats groups or individual stat fields may be missing from
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* Note that entire stats groups or individual stat fields may be missing from
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* the output in case they are not supported by the given hypervisor, are not
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* the output in case they are not supported by the given hypervisor, are not
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@ -9571,6 +9571,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
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VIR_PERF_PARAM_TASK_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
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VIR_PERF_PARAM_TASK_CLOCK, VIR_TYPED_PARAM_BOOLEAN,
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VIR_PERF_PARAM_PAGE_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
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VIR_PERF_PARAM_PAGE_FAULTS, VIR_TYPED_PARAM_BOOLEAN,
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VIR_PERF_PARAM_CONTEXT_SWITCHES, VIR_TYPED_PARAM_BOOLEAN,
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VIR_PERF_PARAM_CONTEXT_SWITCHES, VIR_TYPED_PARAM_BOOLEAN,
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VIR_PERF_PARAM_CPU_MIGRATIONS, VIR_TYPED_PARAM_BOOLEAN,
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NULL) < 0)
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NULL) < 0)
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return -1;
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return -1;
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@ -45,7 +45,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
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"bus_cycles", "stalled_cycles_frontend",
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"bus_cycles", "stalled_cycles_frontend",
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"stalled_cycles_backend", "ref_cpu_cycles",
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"stalled_cycles_backend", "ref_cpu_cycles",
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"cpu_clock", "task_clock", "page_faults",
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"cpu_clock", "task_clock", "page_faults",
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"context_switches");
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"context_switches", "cpu_migrations");
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struct virPerfEvent {
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struct virPerfEvent {
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int type;
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int type;
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@ -126,6 +126,9 @@ static struct virPerfEventAttr attrs[] = {
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{.type = VIR_PERF_EVENT_CONTEXT_SWITCHES,
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{.type = VIR_PERF_EVENT_CONTEXT_SWITCHES,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_CONTEXT_SWITCHES},
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.attrConfig = PERF_COUNT_SW_CONTEXT_SWITCHES},
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{.type = VIR_PERF_EVENT_CPU_MIGRATIONS,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_CPU_MIGRATIONS},
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};
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};
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typedef struct virPerfEventAttr *virPerfEventAttrPtr;
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typedef struct virPerfEventAttr *virPerfEventAttrPtr;
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@ -51,6 +51,7 @@ typedef enum {
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VIR_PERF_EVENT_TASK_CLOCK, /* Count of task clock time*/
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VIR_PERF_EVENT_TASK_CLOCK, /* Count of task clock time*/
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VIR_PERF_EVENT_PAGE_FAULTS, /* Count of total page faults */
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VIR_PERF_EVENT_PAGE_FAULTS, /* Count of total page faults */
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VIR_PERF_EVENT_CONTEXT_SWITCHES, /* Count of context switches */
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VIR_PERF_EVENT_CONTEXT_SWITCHES, /* Count of context switches */
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VIR_PERF_EVENT_CPU_MIGRATIONS, /* Count of cpu migrations */
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VIR_PERF_EVENT_LAST
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VIR_PERF_EVENT_LAST
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} virPerfEventType;
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} virPerfEventType;
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@ -30,6 +30,7 @@
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<event name='task_clock' enabled='yes'/>
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<event name='task_clock' enabled='yes'/>
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<event name='page_faults' enabled='yes'/>
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<event name='page_faults' enabled='yes'/>
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<event name='context_switches' enabled='yes'/>
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<event name='context_switches' enabled='yes'/>
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<event name='cpu_migrations' enabled='yes'/>
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</perf>
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</perf>
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<devices>
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<devices>
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</devices>
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</devices>
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@ -968,6 +968,7 @@ I<--perf> returns the statistics of all enabled perf events:
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"perf.task_clock" - the count of task clock time
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"perf.task_clock" - the count of task clock time
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"perf.page_faults" - the count of page faults
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"perf.page_faults" - the count of page faults
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"perf.context_switches" - the count of context switches
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"perf.context_switches" - the count of context switches
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"perf.cpu_migrations" - the count of cpu migrations
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See the B<perf> command for more details about each event.
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See the B<perf> command for more details about each event.
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@ -2345,6 +2346,8 @@ B<Valid perf event names>
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applications running on the platform.
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applications running on the platform.
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context_switches - Provides the count of context switches
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context_switches - Provides the count of context switches
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by applications running on the platform.
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by applications running on the platform.
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cpu_migrations - Provides the count cpu migrations by
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applications running on the platform.
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B<Note>: The statistics can be retrieved using the B<domstats> command using
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B<Note>: The statistics can be retrieved using the B<domstats> command using
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the I<--perf> flag.
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the I<--perf> flag.
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