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perf_counter: move the event overflow output bits to record_type
Per suggestion from Paul, move the event overflow bits to record_type and sanitize the enums a bit. Breaks the ABI -- again ;-) Suggested-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Corey Ashford <cjashfor@linux.vnet.ibm.com> Orig-LKML-Reference: <20090402091319.151921176@chello.nl> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Zijlstra
Ingo Molnar
parent
9dd499889b
commit
8a057d8491
@ -73,15 +73,6 @@ enum sw_event_ids {
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PERF_SW_EVENTS_MAX = 7,
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};
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/*
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* IRQ-notification data record type:
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*/
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enum perf_counter_record_type {
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PERF_RECORD_SIMPLE = 0,
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PERF_RECORD_IRQ = 1,
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PERF_RECORD_GROUP = 2,
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};
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#define __PERF_COUNTER_MASK(name) \
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(((1ULL << PERF_COUNTER_##name##_BITS) - 1) << \
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PERF_COUNTER_##name##_SHIFT)
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@ -102,6 +93,17 @@ enum perf_counter_record_type {
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#define PERF_COUNTER_EVENT_SHIFT 0
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#define PERF_COUNTER_EVENT_MASK __PERF_COUNTER_MASK(EVENT)
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/*
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* Bits that can be set in hw_event.record_type to request information
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* in the overflow packets.
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*/
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enum perf_counter_record_format {
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PERF_RECORD_IP = 1U << 0,
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PERF_RECORD_TID = 1U << 1,
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PERF_RECORD_GROUP = 1U << 2,
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PERF_RECORD_CALLCHAIN = 1U << 3,
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};
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/*
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* Bits that can be set in hw_event.read_format to request that
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* reads on the counter should return the indicated quantities,
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@ -125,8 +127,8 @@ struct perf_counter_hw_event {
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__u64 config;
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__u64 irq_period;
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__u64 record_type;
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__u64 read_format;
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__u32 record_type;
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__u32 read_format;
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__u64 disabled : 1, /* off by default */
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nmi : 1, /* NMI sampling */
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@ -137,12 +139,10 @@ struct perf_counter_hw_event {
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exclude_kernel : 1, /* ditto kernel */
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exclude_hv : 1, /* ditto hypervisor */
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exclude_idle : 1, /* don't count when idle */
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include_tid : 1, /* include the tid */
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mmap : 1, /* include mmap data */
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munmap : 1, /* include munmap data */
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callchain : 1, /* add callchain data */
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__reserved_1 : 51;
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__reserved_1 : 53;
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__u32 extra_config_len;
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__u32 __reserved_4;
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@ -212,15 +212,21 @@ struct perf_event_header {
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enum perf_event_type {
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PERF_EVENT_GROUP = 1,
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PERF_EVENT_MMAP = 1,
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PERF_EVENT_MUNMAP = 2,
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PERF_EVENT_MMAP = 2,
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PERF_EVENT_MUNMAP = 3,
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PERF_EVENT_OVERFLOW = 1UL << 31,
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__PERF_EVENT_IP = 1UL << 30,
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__PERF_EVENT_TID = 1UL << 29,
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__PERF_EVENT_CALLCHAIN = 1UL << 28,
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/*
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* Half the event type space is reserved for the counter overflow
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* bitfields, as found in hw_event.record_type.
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*
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* These events will have types of the form:
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* PERF_EVENT_COUNTER_OVERFLOW { | __PERF_EVENT_* } *
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*/
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PERF_EVENT_COUNTER_OVERFLOW = 1UL << 31,
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__PERF_EVENT_IP = PERF_RECORD_IP,
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__PERF_EVENT_TID = PERF_RECORD_TID,
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__PERF_EVENT_GROUP = PERF_RECORD_GROUP,
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__PERF_EVENT_CALLCHAIN = PERF_RECORD_CALLCHAIN,
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};
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#ifdef __KERNEL__
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@ -1765,27 +1765,34 @@ static void perf_output_end(struct perf_output_handle *handle)
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rcu_read_unlock();
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}
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static void perf_output_simple(struct perf_counter *counter,
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int nmi, struct pt_regs *regs)
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void perf_counter_output(struct perf_counter *counter,
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int nmi, struct pt_regs *regs)
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{
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int ret;
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u64 record_type = counter->hw_event.record_type;
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struct perf_output_handle handle;
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struct perf_event_header header;
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u64 ip;
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struct {
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u32 pid, tid;
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} tid_entry;
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struct {
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u64 event;
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u64 counter;
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} group_entry;
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struct perf_callchain_entry *callchain = NULL;
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int callchain_size = 0;
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header.type = PERF_EVENT_OVERFLOW;
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header.type = PERF_EVENT_COUNTER_OVERFLOW;
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header.size = sizeof(header);
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ip = instruction_pointer(regs);
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header.type |= __PERF_EVENT_IP;
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header.size += sizeof(ip);
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if (record_type & PERF_RECORD_IP) {
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ip = instruction_pointer(regs);
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header.type |= __PERF_EVENT_IP;
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header.size += sizeof(ip);
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}
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if (counter->hw_event.include_tid) {
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if (record_type & PERF_RECORD_TID) {
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/* namespace issues */
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tid_entry.pid = current->group_leader->pid;
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tid_entry.tid = current->pid;
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@ -1794,7 +1801,13 @@ static void perf_output_simple(struct perf_counter *counter,
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header.size += sizeof(tid_entry);
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}
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if (counter->hw_event.callchain) {
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if (record_type & PERF_RECORD_GROUP) {
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header.type |= __PERF_EVENT_GROUP;
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header.size += sizeof(u64) +
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counter->nr_siblings * sizeof(group_entry);
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}
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if (record_type & PERF_RECORD_CALLCHAIN) {
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callchain = perf_callchain(regs);
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if (callchain) {
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@ -1810,71 +1823,37 @@ static void perf_output_simple(struct perf_counter *counter,
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return;
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perf_output_put(&handle, header);
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perf_output_put(&handle, ip);
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if (counter->hw_event.include_tid)
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if (record_type & PERF_RECORD_IP)
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perf_output_put(&handle, ip);
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if (record_type & PERF_RECORD_TID)
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perf_output_put(&handle, tid_entry);
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if (record_type & PERF_RECORD_GROUP) {
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struct perf_counter *leader, *sub;
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u64 nr = counter->nr_siblings;
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perf_output_put(&handle, nr);
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leader = counter->group_leader;
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list_for_each_entry(sub, &leader->sibling_list, list_entry) {
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if (sub != counter)
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sub->hw_ops->read(sub);
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group_entry.event = sub->hw_event.config;
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group_entry.counter = atomic64_read(&sub->count);
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perf_output_put(&handle, group_entry);
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}
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}
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if (callchain)
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perf_output_copy(&handle, callchain, callchain_size);
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perf_output_end(&handle);
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}
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static void perf_output_group(struct perf_counter *counter, int nmi)
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{
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struct perf_output_handle handle;
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struct perf_event_header header;
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struct perf_counter *leader, *sub;
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unsigned int size;
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struct {
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u64 event;
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u64 counter;
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} entry;
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int ret;
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size = sizeof(header) + counter->nr_siblings * sizeof(entry);
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ret = perf_output_begin(&handle, counter, size, nmi);
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if (ret)
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return;
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header.type = PERF_EVENT_GROUP;
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header.size = size;
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perf_output_put(&handle, header);
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leader = counter->group_leader;
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list_for_each_entry(sub, &leader->sibling_list, list_entry) {
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if (sub != counter)
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sub->hw_ops->read(sub);
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entry.event = sub->hw_event.config;
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entry.counter = atomic64_read(&sub->count);
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perf_output_put(&handle, entry);
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}
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perf_output_end(&handle);
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}
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void perf_counter_output(struct perf_counter *counter,
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int nmi, struct pt_regs *regs)
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{
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switch (counter->hw_event.record_type) {
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case PERF_RECORD_SIMPLE:
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return;
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case PERF_RECORD_IRQ:
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perf_output_simple(counter, nmi, regs);
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break;
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case PERF_RECORD_GROUP:
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perf_output_group(counter, nmi);
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break;
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}
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}
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/*
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* mmap tracking
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*/
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