671 строка
17 KiB
C
671 строка
17 KiB
C
/*
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* Performance counters:
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*
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* Copyright(C) 2008, Thomas Gleixner <tglx@linutronix.de>
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* Copyright(C) 2008, Red Hat, Inc., Ingo Molnar
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*
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* Data type definitions, declarations, prototypes.
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*
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* Started by: Thomas Gleixner and Ingo Molnar
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*
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* For licencing details see kernel-base/COPYING
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*/
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#ifndef _LINUX_PERF_COUNTER_H
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#define _LINUX_PERF_COUNTER_H
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#include <linux/types.h>
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#include <linux/ioctl.h>
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#include <asm/byteorder.h>
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/*
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* User-space ABI bits:
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*/
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/*
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* hw_event.type
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*/
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enum perf_event_types {
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PERF_TYPE_HARDWARE = 0,
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PERF_TYPE_SOFTWARE = 1,
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PERF_TYPE_TRACEPOINT = 2,
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/*
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* available TYPE space, raw is the max value.
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*/
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PERF_TYPE_RAW = 128,
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};
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/*
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* Generalized performance counter event types, used by the hw_event.event_id
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* parameter of the sys_perf_counter_open() syscall:
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*/
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enum hw_event_ids {
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/*
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* Common hardware events, generalized by the kernel:
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*/
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PERF_COUNT_CPU_CYCLES = 0,
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PERF_COUNT_INSTRUCTIONS = 1,
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PERF_COUNT_CACHE_REFERENCES = 2,
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PERF_COUNT_CACHE_MISSES = 3,
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PERF_COUNT_BRANCH_INSTRUCTIONS = 4,
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PERF_COUNT_BRANCH_MISSES = 5,
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PERF_COUNT_BUS_CYCLES = 6,
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PERF_HW_EVENTS_MAX = 7,
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};
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/*
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* Special "software" counters provided by the kernel, even if the hardware
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* does not support performance counters. These counters measure various
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* physical and sw events of the kernel (and allow the profiling of them as
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* well):
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*/
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enum sw_event_ids {
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PERF_COUNT_CPU_CLOCK = 0,
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PERF_COUNT_TASK_CLOCK = 1,
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PERF_COUNT_PAGE_FAULTS = 2,
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PERF_COUNT_CONTEXT_SWITCHES = 3,
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PERF_COUNT_CPU_MIGRATIONS = 4,
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PERF_COUNT_PAGE_FAULTS_MIN = 5,
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PERF_COUNT_PAGE_FAULTS_MAJ = 6,
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PERF_SW_EVENTS_MAX = 7,
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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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#define PERF_COUNTER_RAW_BITS 1
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#define PERF_COUNTER_RAW_SHIFT 63
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#define PERF_COUNTER_RAW_MASK __PERF_COUNTER_MASK(RAW)
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#define PERF_COUNTER_CONFIG_BITS 63
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#define PERF_COUNTER_CONFIG_SHIFT 0
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#define PERF_COUNTER_CONFIG_MASK __PERF_COUNTER_MASK(CONFIG)
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#define PERF_COUNTER_TYPE_BITS 7
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#define PERF_COUNTER_TYPE_SHIFT 56
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#define PERF_COUNTER_TYPE_MASK __PERF_COUNTER_MASK(TYPE)
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#define PERF_COUNTER_EVENT_BITS 56
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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_TIME = 1U << 2,
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PERF_RECORD_ADDR = 1U << 3,
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PERF_RECORD_GROUP = 1U << 4,
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PERF_RECORD_CALLCHAIN = 1U << 5,
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PERF_RECORD_CONFIG = 1U << 6,
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PERF_RECORD_CPU = 1U << 7,
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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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* in increasing order of bit value, after the counter value.
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*/
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enum perf_counter_read_format {
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PERF_FORMAT_TOTAL_TIME_ENABLED = 1,
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PERF_FORMAT_TOTAL_TIME_RUNNING = 2,
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};
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/*
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* Hardware event to monitor via a performance monitoring counter:
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*/
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struct perf_counter_hw_event {
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/*
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* The MSB of the config word signifies if the rest contains cpu
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* specific (raw) counter configuration data, if unset, the next
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* 7 bits are an event type and the rest of the bits are the event
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* identifier.
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*/
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__u64 config;
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union {
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__u64 irq_period;
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__u64 irq_freq;
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};
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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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inherit : 1, /* children inherit it */
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pinned : 1, /* must always be on PMU */
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exclusive : 1, /* only group on PMU */
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exclude_user : 1, /* don't count user */
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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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mmap : 1, /* include mmap data */
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munmap : 1, /* include munmap data */
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comm : 1, /* include comm data */
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freq : 1, /* use freq, not period */
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__reserved_1 : 51;
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__u32 wakeup_events; /* wakeup every n events */
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__u32 __reserved_2;
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__u64 __reserved_3;
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__u64 __reserved_4;
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};
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/*
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* Ioctls that can be done on a perf counter fd:
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*/
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#define PERF_COUNTER_IOC_ENABLE _IOW('$', 0, u32)
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#define PERF_COUNTER_IOC_DISABLE _IOW('$', 1, u32)
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#define PERF_COUNTER_IOC_REFRESH _IOW('$', 2, u32)
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#define PERF_COUNTER_IOC_RESET _IOW('$', 3, u32)
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enum perf_counter_ioc_flags {
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PERF_IOC_FLAG_GROUP = 1U << 0,
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};
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/*
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* Structure of the page that can be mapped via mmap
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*/
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struct perf_counter_mmap_page {
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__u32 version; /* version number of this structure */
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__u32 compat_version; /* lowest version this is compat with */
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/*
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* Bits needed to read the hw counters in user-space.
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*
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* u32 seq;
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* s64 count;
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*
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* do {
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* seq = pc->lock;
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*
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* barrier()
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* if (pc->index) {
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* count = pmc_read(pc->index - 1);
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* count += pc->offset;
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* } else
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* goto regular_read;
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*
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* barrier();
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* } while (pc->lock != seq);
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*
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* NOTE: for obvious reason this only works on self-monitoring
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* processes.
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*/
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__u32 lock; /* seqlock for synchronization */
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__u32 index; /* hardware counter identifier */
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__s64 offset; /* add to hardware counter value */
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/*
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* Control data for the mmap() data buffer.
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*
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* User-space reading this value should issue an rmb(), on SMP capable
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* platforms, after reading this value -- see perf_counter_wakeup().
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*/
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__u32 data_head; /* head in the data section */
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};
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#define PERF_EVENT_MISC_CPUMODE_MASK (3 << 0)
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#define PERF_EVENT_MISC_CPUMODE_UNKNOWN (0 << 0)
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#define PERF_EVENT_MISC_KERNEL (1 << 0)
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#define PERF_EVENT_MISC_USER (2 << 0)
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#define PERF_EVENT_MISC_HYPERVISOR (3 << 0)
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#define PERF_EVENT_MISC_OVERFLOW (1 << 2)
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struct perf_event_header {
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__u32 type;
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__u16 misc;
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__u16 size;
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};
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enum perf_event_type {
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/*
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* The MMAP events record the PROT_EXEC mappings so that we can
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* correlate userspace IPs to code. They have the following structure:
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*
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* struct {
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* struct perf_event_header header;
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*
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* u32 pid, tid;
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* u64 addr;
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* u64 len;
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* u64 pgoff;
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* char filename[];
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* };
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*/
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PERF_EVENT_MMAP = 1,
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PERF_EVENT_MUNMAP = 2,
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/*
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* struct {
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* struct perf_event_header header;
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*
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* u32 pid, tid;
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* char comm[];
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* };
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*/
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PERF_EVENT_COMM = 3,
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/*
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* struct {
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* struct perf_event_header header;
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* u64 time;
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* u64 irq_period;
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* };
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*/
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PERF_EVENT_PERIOD = 4,
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/*
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* struct {
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* struct perf_event_header header;
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* u64 time;
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* };
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*/
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PERF_EVENT_THROTTLE = 5,
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PERF_EVENT_UNTHROTTLE = 6,
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/*
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* When header.misc & PERF_EVENT_MISC_OVERFLOW the event_type field
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* will be PERF_RECORD_*
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*
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* struct {
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* struct perf_event_header header;
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*
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* { u64 ip; } && PERF_RECORD_IP
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* { u32 pid, tid; } && PERF_RECORD_TID
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* { u64 time; } && PERF_RECORD_TIME
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* { u64 addr; } && PERF_RECORD_ADDR
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* { u64 config; } && PERF_RECORD_CONFIG
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* { u32 cpu, res; } && PERF_RECORD_CPU
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*
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* { u64 nr;
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* { u64 event, val; } cnt[nr]; } && PERF_RECORD_GROUP
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*
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* { u16 nr,
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* hv,
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* kernel,
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* user;
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* u64 ips[nr]; } && PERF_RECORD_CALLCHAIN
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* };
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*/
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};
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#ifdef __KERNEL__
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/*
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* Kernel-internal data types and definitions:
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*/
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#ifdef CONFIG_PERF_COUNTERS
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# include <asm/perf_counter.h>
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#endif
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#include <linux/list.h>
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#include <linux/mutex.h>
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#include <linux/rculist.h>
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#include <linux/rcupdate.h>
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#include <linux/spinlock.h>
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#include <linux/hrtimer.h>
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#include <linux/fs.h>
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#include <asm/atomic.h>
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struct task_struct;
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static inline u64 perf_event_raw(struct perf_counter_hw_event *hw_event)
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{
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return hw_event->config & PERF_COUNTER_RAW_MASK;
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}
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static inline u64 perf_event_config(struct perf_counter_hw_event *hw_event)
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{
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return hw_event->config & PERF_COUNTER_CONFIG_MASK;
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}
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static inline u64 perf_event_type(struct perf_counter_hw_event *hw_event)
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{
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return (hw_event->config & PERF_COUNTER_TYPE_MASK) >>
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PERF_COUNTER_TYPE_SHIFT;
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}
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static inline u64 perf_event_id(struct perf_counter_hw_event *hw_event)
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{
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return hw_event->config & PERF_COUNTER_EVENT_MASK;
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}
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/**
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* struct hw_perf_counter - performance counter hardware details:
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*/
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struct hw_perf_counter {
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#ifdef CONFIG_PERF_COUNTERS
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union {
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struct { /* hardware */
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u64 config;
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unsigned long config_base;
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unsigned long counter_base;
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int nmi;
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int idx;
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};
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union { /* software */
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atomic64_t count;
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struct hrtimer hrtimer;
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};
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};
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atomic64_t prev_count;
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u64 irq_period;
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atomic64_t period_left;
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u64 interrupts;
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#endif
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};
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struct perf_counter;
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/**
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* struct pmu - generic performance monitoring unit
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*/
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struct pmu {
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int (*enable) (struct perf_counter *counter);
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void (*disable) (struct perf_counter *counter);
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void (*read) (struct perf_counter *counter);
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void (*unthrottle) (struct perf_counter *counter);
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};
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/**
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* enum perf_counter_active_state - the states of a counter
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*/
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enum perf_counter_active_state {
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PERF_COUNTER_STATE_ERROR = -2,
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PERF_COUNTER_STATE_OFF = -1,
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PERF_COUNTER_STATE_INACTIVE = 0,
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PERF_COUNTER_STATE_ACTIVE = 1,
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};
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struct file;
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struct perf_mmap_data {
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struct rcu_head rcu_head;
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int nr_pages; /* nr of data pages */
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int nr_locked; /* nr pages mlocked */
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atomic_t poll; /* POLL_ for wakeups */
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atomic_t head; /* write position */
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atomic_t events; /* event limit */
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atomic_t done_head; /* completed head */
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atomic_t lock; /* concurrent writes */
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atomic_t wakeup; /* needs a wakeup */
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struct perf_counter_mmap_page *user_page;
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void *data_pages[0];
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};
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struct perf_pending_entry {
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struct perf_pending_entry *next;
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void (*func)(struct perf_pending_entry *);
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};
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/**
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* struct perf_counter - performance counter kernel representation:
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*/
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struct perf_counter {
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#ifdef CONFIG_PERF_COUNTERS
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struct list_head list_entry;
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struct list_head event_entry;
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struct list_head sibling_list;
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int nr_siblings;
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struct perf_counter *group_leader;
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const struct pmu *pmu;
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enum perf_counter_active_state state;
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enum perf_counter_active_state prev_state;
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atomic64_t count;
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/*
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* These are the total time in nanoseconds that the counter
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* has been enabled (i.e. eligible to run, and the task has
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* been scheduled in, if this is a per-task counter)
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* and running (scheduled onto the CPU), respectively.
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*
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* They are computed from tstamp_enabled, tstamp_running and
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* tstamp_stopped when the counter is in INACTIVE or ACTIVE state.
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*/
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u64 total_time_enabled;
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u64 total_time_running;
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/*
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* These are timestamps used for computing total_time_enabled
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* and total_time_running when the counter is in INACTIVE or
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* ACTIVE state, measured in nanoseconds from an arbitrary point
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* in time.
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* tstamp_enabled: the notional time when the counter was enabled
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* tstamp_running: the notional time when the counter was scheduled on
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* tstamp_stopped: in INACTIVE state, the notional time when the
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* counter was scheduled off.
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*/
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u64 tstamp_enabled;
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u64 tstamp_running;
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u64 tstamp_stopped;
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struct perf_counter_hw_event hw_event;
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struct hw_perf_counter hw;
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struct perf_counter_context *ctx;
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struct file *filp;
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/*
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* These accumulate total time (in nanoseconds) that children
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* counters have been enabled and running, respectively.
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*/
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atomic64_t child_total_time_enabled;
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atomic64_t child_total_time_running;
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/*
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* Protect attach/detach and child_list:
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*/
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struct mutex child_mutex;
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struct list_head child_list;
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struct perf_counter *parent;
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int oncpu;
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int cpu;
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struct list_head owner_entry;
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struct task_struct *owner;
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/* mmap bits */
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struct mutex mmap_mutex;
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atomic_t mmap_count;
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struct perf_mmap_data *data;
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/* poll related */
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wait_queue_head_t waitq;
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struct fasync_struct *fasync;
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/* delayed work for NMIs and such */
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int pending_wakeup;
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int pending_kill;
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int pending_disable;
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struct perf_pending_entry pending;
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atomic_t event_limit;
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void (*destroy)(struct perf_counter *);
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struct rcu_head rcu_head;
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#endif
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};
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/**
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* struct perf_counter_context - counter context structure
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*
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* Used as a container for task counters and CPU counters as well:
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*/
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struct perf_counter_context {
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/*
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* Protect the states of the counters in the list,
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* nr_active, and the list:
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*/
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spinlock_t lock;
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/*
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* Protect the list of counters. Locking either mutex or lock
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* is sufficient to ensure the list doesn't change; to change
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* the list you need to lock both the mutex and the spinlock.
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*/
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struct mutex mutex;
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struct list_head counter_list;
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struct list_head event_list;
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int nr_counters;
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int nr_active;
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int is_active;
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atomic_t refcount;
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struct task_struct *task;
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/*
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* Context clock, runs when context enabled.
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*/
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u64 time;
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u64 timestamp;
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/*
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* These fields let us detect when two contexts have both
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* been cloned (inherited) from a common ancestor.
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*/
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struct perf_counter_context *parent_ctx;
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u32 parent_gen;
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u32 generation;
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};
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/**
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* struct perf_counter_cpu_context - per cpu counter context structure
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*/
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struct perf_cpu_context {
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struct perf_counter_context ctx;
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struct perf_counter_context *task_ctx;
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int active_oncpu;
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int max_pertask;
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|
int exclusive;
|
|
|
|
/*
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* Recursion avoidance:
|
|
*
|
|
* task, softirq, irq, nmi context
|
|
*/
|
|
int recursion[4];
|
|
};
|
|
|
|
#ifdef CONFIG_PERF_COUNTERS
|
|
|
|
/*
|
|
* Set by architecture code:
|
|
*/
|
|
extern int perf_max_counters;
|
|
|
|
extern const struct pmu *hw_perf_counter_init(struct perf_counter *counter);
|
|
|
|
extern void perf_counter_task_sched_in(struct task_struct *task, int cpu);
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|
extern void perf_counter_task_sched_out(struct task_struct *task,
|
|
struct task_struct *next, int cpu);
|
|
extern void perf_counter_task_tick(struct task_struct *task, int cpu);
|
|
extern int perf_counter_init_task(struct task_struct *child);
|
|
extern void perf_counter_exit_task(struct task_struct *child);
|
|
extern void perf_counter_do_pending(void);
|
|
extern void perf_counter_print_debug(void);
|
|
extern void __perf_disable(void);
|
|
extern bool __perf_enable(void);
|
|
extern void perf_disable(void);
|
|
extern void perf_enable(void);
|
|
extern int perf_counter_task_disable(void);
|
|
extern int perf_counter_task_enable(void);
|
|
extern int hw_perf_group_sched_in(struct perf_counter *group_leader,
|
|
struct perf_cpu_context *cpuctx,
|
|
struct perf_counter_context *ctx, int cpu);
|
|
extern void perf_counter_update_userpage(struct perf_counter *counter);
|
|
|
|
extern int perf_counter_overflow(struct perf_counter *counter,
|
|
int nmi, struct pt_regs *regs, u64 addr);
|
|
/*
|
|
* Return 1 for a software counter, 0 for a hardware counter
|
|
*/
|
|
static inline int is_software_counter(struct perf_counter *counter)
|
|
{
|
|
return !perf_event_raw(&counter->hw_event) &&
|
|
perf_event_type(&counter->hw_event) != PERF_TYPE_HARDWARE;
|
|
}
|
|
|
|
extern void perf_swcounter_event(u32, u64, int, struct pt_regs *, u64);
|
|
|
|
extern void perf_counter_mmap(unsigned long addr, unsigned long len,
|
|
unsigned long pgoff, struct file *file);
|
|
|
|
extern void perf_counter_munmap(unsigned long addr, unsigned long len,
|
|
unsigned long pgoff, struct file *file);
|
|
|
|
extern void perf_counter_comm(struct task_struct *tsk);
|
|
|
|
#define MAX_STACK_DEPTH 255
|
|
|
|
struct perf_callchain_entry {
|
|
u16 nr, hv, kernel, user;
|
|
u64 ip[MAX_STACK_DEPTH];
|
|
};
|
|
|
|
extern struct perf_callchain_entry *perf_callchain(struct pt_regs *regs);
|
|
|
|
extern int sysctl_perf_counter_priv;
|
|
extern int sysctl_perf_counter_mlock;
|
|
extern int sysctl_perf_counter_limit;
|
|
|
|
extern void perf_counter_init(void);
|
|
|
|
#ifndef perf_misc_flags
|
|
#define perf_misc_flags(regs) (user_mode(regs) ? PERF_EVENT_MISC_USER : \
|
|
PERF_EVENT_MISC_KERNEL)
|
|
#define perf_instruction_pointer(regs) instruction_pointer(regs)
|
|
#endif
|
|
|
|
#else
|
|
static inline void
|
|
perf_counter_task_sched_in(struct task_struct *task, int cpu) { }
|
|
static inline void
|
|
perf_counter_task_sched_out(struct task_struct *task,
|
|
struct task_struct *next, int cpu) { }
|
|
static inline void
|
|
perf_counter_task_tick(struct task_struct *task, int cpu) { }
|
|
static inline int perf_counter_init_task(struct task_struct *child) { }
|
|
static inline void perf_counter_exit_task(struct task_struct *child) { }
|
|
static inline void perf_counter_do_pending(void) { }
|
|
static inline void perf_counter_print_debug(void) { }
|
|
static inline void perf_disable(void) { }
|
|
static inline void perf_enable(void) { }
|
|
static inline int perf_counter_task_disable(void) { return -EINVAL; }
|
|
static inline int perf_counter_task_enable(void) { return -EINVAL; }
|
|
|
|
static inline void
|
|
perf_swcounter_event(u32 event, u64 nr, int nmi,
|
|
struct pt_regs *regs, u64 addr) { }
|
|
|
|
static inline void
|
|
perf_counter_mmap(unsigned long addr, unsigned long len,
|
|
unsigned long pgoff, struct file *file) { }
|
|
|
|
static inline void
|
|
perf_counter_munmap(unsigned long addr, unsigned long len,
|
|
unsigned long pgoff, struct file *file) { }
|
|
|
|
static inline void perf_counter_comm(struct task_struct *tsk) { }
|
|
static inline void perf_counter_init(void) { }
|
|
#endif
|
|
|
|
#endif /* __KERNEL__ */
|
|
#endif /* _LINUX_PERF_COUNTER_H */
|