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perf: add page_faults_maj software perf event support
This patch adds support and documentation for the page_faults_maj perf event. Signed-off-by: Nitesh Konkar <nitkon12@linux.vnet.ibm.com>
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@ -1953,6 +1953,7 @@
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<event name='context_switches' enabled='no'/>
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<event name='cpu_migrations' enabled='no'/>
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<event name='page_faults_min' enabled='no'/>
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<event name='page_faults_maj' enabled='no'/>
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</perf>
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...
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</pre>
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@ -2073,6 +2074,14 @@
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applications running on the platform</td>
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<td><code>perf.page_faults_min</code></td>
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</tr>
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<tr>
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<td><code>page_faults_maj</code></td>
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<td>the count of major page faults, that is, where the
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page was not present in the page cache, and
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therefore had to be fetched from storage, by
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applications running on the platform</td>
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<td><code>perf.page_faults_maj</code></td>
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</tr>
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</table>
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<h3><a name="elementsDevices">Devices</a></h3>
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@ -439,6 +439,7 @@
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<value>context_switches</value>
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<value>cpu_migrations</value>
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<value>page_faults_min</value>
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<value>page_faults_maj</value>
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</choice>
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</attribute>
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<attribute name="enabled">
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@ -2250,6 +2250,16 @@ void virDomainStatsRecordListFree(virDomainStatsRecordPtr *stats);
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*/
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# define VIR_PERF_PARAM_PAGE_FAULTS_MIN "page_faults_min"
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/**
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* VIR_PERF_PARAM_PAGE_FAULTS_MAJ:
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*
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* Macro for typed parameter name that represents page_faults_maj
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* perf event which can be used to measure the count of major page
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* faults by applications running on the platform. It corresponds
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* to the "perf.page_faults_maj" field in the *Stats APIs.
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*/
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# define VIR_PERF_PARAM_PAGE_FAULTS_MAJ "page_faults_maj"
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int virDomainGetPerfEvents(virDomainPtr dom,
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virTypedParameterPtr *params,
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int *nparams,
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@ -11266,6 +11266,9 @@ virConnectGetDomainCapabilities(virConnectPtr conn,
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* "perf.page_faults_min" - The count of minor page faults as unsigned
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* long long. It is produced by the
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* page_faults_min perf event.
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* "perf.page_faults_maj" - The count of major page faults as unsigned
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* long long. It is produced by the
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* page_faults_maj perf event.
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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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* the output in case they are not supported by the given hypervisor, are not
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@ -9573,6 +9573,7 @@ qemuDomainSetPerfEvents(virDomainPtr dom,
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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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VIR_PERF_PARAM_PAGE_FAULTS_MIN, VIR_TYPED_PARAM_BOOLEAN,
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VIR_PERF_PARAM_PAGE_FAULTS_MAJ, VIR_TYPED_PARAM_BOOLEAN,
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NULL) < 0)
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return -1;
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@ -46,7 +46,7 @@ VIR_ENUM_IMPL(virPerfEvent, VIR_PERF_EVENT_LAST,
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"stalled_cycles_backend", "ref_cpu_cycles",
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"cpu_clock", "task_clock", "page_faults",
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"context_switches", "cpu_migrations",
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"page_faults_min");
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"page_faults_min", "page_faults_maj");
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struct virPerfEvent {
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int type;
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@ -133,6 +133,9 @@ static struct virPerfEventAttr attrs[] = {
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{.type = VIR_PERF_EVENT_PAGE_FAULTS_MIN,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_PAGE_FAULTS_MIN},
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{.type = VIR_PERF_EVENT_PAGE_FAULTS_MAJ,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_PAGE_FAULTS_MAJ},
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};
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typedef struct virPerfEventAttr *virPerfEventAttrPtr;
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@ -53,6 +53,7 @@ typedef enum {
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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_PAGE_FAULTS_MIN, /* Count of minor page faults */
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VIR_PERF_EVENT_PAGE_FAULTS_MAJ, /* Count of major page faults */
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VIR_PERF_EVENT_LAST
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} virPerfEventType;
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@ -32,6 +32,7 @@
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<event name='context_switches' enabled='yes'/>
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<event name='cpu_migrations' enabled='yes'/>
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<event name='page_faults_min' enabled='yes'/>
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<event name='page_faults_maj' enabled='yes'/>
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</perf>
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<devices>
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</devices>
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@ -970,6 +970,7 @@ I<--perf> returns the statistics of all enabled perf events:
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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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"perf.page_faults_min" - the count of minor page faults
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"perf.page_faults_maj" - the count of major page faults
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See the B<perf> command for more details about each event.
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@ -2351,6 +2352,8 @@ B<Valid perf event names>
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applications running on the platform.
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page_faults_min - Provides the count minor page faults
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by applications running on the platform.
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page_faults_maj - Provides the count major page faults
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by 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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the I<--perf> flag.
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