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perf: get rid of pointless virPerfGetEventAttr() method
The virPerfGetEventAttr method contains a totally pointless loop. Remove it, verify the array size statically, and then just use an array index to access the perf event. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
This commit is contained in:
Daniel P. Berrange
parent
c3d1df7b85
commit
5fca70ef57
@ -71,102 +71,109 @@ struct virPerf {
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# include <linux/perf_event.h>
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struct virPerfEventAttr {
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int type;
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unsigned int attrType;
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unsigned long long attrConfig;
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};
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static struct virPerfEventAttr attrs[] = {
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{.type = VIR_PERF_EVENT_CMT, .attrType = 0, .attrConfig = 1},
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{.type = VIR_PERF_EVENT_MBMT, .attrType = 0, .attrConfig = 2},
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{.type = VIR_PERF_EVENT_MBML, .attrType = 0, .attrConfig = 3},
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{.type = VIR_PERF_EVENT_CPU_CYCLES,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_CPU_CYCLES},
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{.type = VIR_PERF_EVENT_INSTRUCTIONS,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_INSTRUCTIONS},
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{.type = VIR_PERF_EVENT_CACHE_REFERENCES,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_CACHE_REFERENCES},
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{.type = VIR_PERF_EVENT_CACHE_MISSES,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_CACHE_MISSES},
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{.type = VIR_PERF_EVENT_BRANCH_INSTRUCTIONS,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_BRANCH_INSTRUCTIONS},
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{.type = VIR_PERF_EVENT_BRANCH_MISSES,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_BRANCH_MISSES},
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{.type = VIR_PERF_EVENT_BUS_CYCLES,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_BUS_CYCLES},
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{.type = VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND},
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{.type = VIR_PERF_EVENT_STALLED_CYCLES_BACKEND,
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_STALLED_CYCLES_BACKEND},
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{.type = VIR_PERF_EVENT_REF_CPU_CYCLES,
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[VIR_PERF_EVENT_CMT] = {
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.attrType = 0,
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.attrConfig = 1
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},
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[VIR_PERF_EVENT_MBMT] = {
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.attrType = 0,
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.attrConfig = 2
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},
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[VIR_PERF_EVENT_MBML] {
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.attrType = 0,
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.attrConfig = 3
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},
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[VIR_PERF_EVENT_CPU_CYCLES] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_CPU_CYCLES
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},
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[VIR_PERF_EVENT_INSTRUCTIONS] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_INSTRUCTIONS
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},
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[VIR_PERF_EVENT_CACHE_REFERENCES] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_CACHE_REFERENCES
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},
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[VIR_PERF_EVENT_CACHE_MISSES] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_CACHE_MISSES
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},
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[VIR_PERF_EVENT_BRANCH_INSTRUCTIONS] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_BRANCH_INSTRUCTIONS
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},
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[VIR_PERF_EVENT_BRANCH_MISSES] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_BRANCH_MISSES
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},
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[VIR_PERF_EVENT_BUS_CYCLES] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_BUS_CYCLES
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},
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[VIR_PERF_EVENT_STALLED_CYCLES_FRONTEND] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_STALLED_CYCLES_FRONTEND
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},
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[VIR_PERF_EVENT_STALLED_CYCLES_BACKEND] = {
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_STALLED_CYCLES_BACKEND
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},
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[VIR_PERF_EVENT_REF_CPU_CYCLES] = {
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# ifdef PERF_COUNT_HW_REF_CPU_CYCLES
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_REF_CPU_CYCLES
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.attrType = PERF_TYPE_HARDWARE,
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.attrConfig = PERF_COUNT_HW_REF_CPU_CYCLES
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# else
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.attrType = 0,
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.attrConfig = 0,
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.attrType = 0,
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.attrConfig = 0,
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# endif
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},
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{.type = VIR_PERF_EVENT_CPU_CLOCK,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_CPU_CLOCK},
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{.type = VIR_PERF_EVENT_TASK_CLOCK,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_TASK_CLOCK},
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{.type = VIR_PERF_EVENT_PAGE_FAULTS,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_PAGE_FAULTS},
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{.type = VIR_PERF_EVENT_CONTEXT_SWITCHES,
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.attrType = PERF_TYPE_SOFTWARE,
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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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{.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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{.type = VIR_PERF_EVENT_ALIGNMENT_FAULTS,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_ALIGNMENT_FAULTS},
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{.type = VIR_PERF_EVENT_EMULATION_FAULTS,
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_EMULATION_FAULTS},
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[VIR_PERF_EVENT_CPU_CLOCK] = {
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_CPU_CLOCK
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},
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[VIR_PERF_EVENT_TASK_CLOCK] = {
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_TASK_CLOCK
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},
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[VIR_PERF_EVENT_PAGE_FAULTS] = {
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_PAGE_FAULTS
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},
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[VIR_PERF_EVENT_CONTEXT_SWITCHES] = {
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_CONTEXT_SWITCHES
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},
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[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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[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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},
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[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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[VIR_PERF_EVENT_ALIGNMENT_FAULTS] = {
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_ALIGNMENT_FAULTS
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},
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[VIR_PERF_EVENT_EMULATION_FAULTS] = {
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.attrType = PERF_TYPE_SOFTWARE,
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.attrConfig = PERF_COUNT_SW_EMULATION_FAULTS
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},
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};
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verify(ARRAY_CARDINALITY(attrs) == VIR_PERF_EVENT_LAST);
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typedef struct virPerfEventAttr *virPerfEventAttrPtr;
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static virPerfEventAttrPtr
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virPerfGetEventAttr(virPerfEventType type)
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{
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size_t i;
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if (type >= VIR_PERF_EVENT_LAST) {
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virReportError(VIR_ERR_INTERNAL_ERROR,
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_("Event '%d' is not supported"),
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type);
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return NULL;
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}
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for (i = 0; i < VIR_PERF_EVENT_LAST; i++) {
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if (i == type)
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return attrs + i;
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}
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return NULL;
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}
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static int
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virPerfRdtAttrInit(void)
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{
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@ -224,9 +231,9 @@ virPerfEventEnable(virPerfPtr perf,
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char *buf = NULL;
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struct perf_event_attr attr;
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virPerfEventPtr event = virPerfGetEvent(perf, type);
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virPerfEventAttrPtr event_attr = virPerfGetEventAttr(type);
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virPerfEventAttrPtr event_attr = &attrs[type];
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if (!event || !event_attr)
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if (!event)
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return -1;
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if (event->enabled)
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@ -237,7 +244,7 @@ virPerfEventEnable(virPerfPtr perf,
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type == VIR_PERF_EVENT_MBML)) {
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virReportError(VIR_ERR_ARGUMENT_UNSUPPORTED,
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_("unable to enable host cpu perf event for %s"),
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virPerfEventTypeToString(event->type));
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virPerfEventTypeToString(type));
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return -1;
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}
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