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Published: Mar 3, 2023 License: BSD-3-Clause Imports: 9 Imported by: 2



Package perffile is a parser for Linux profiles.

Parsing a profile starts with a call to New or Open to open a file. A file consists of a sequence of records, which can be retrieved with File.Records, as well as several metadata fields, which can be retrieved with other methods of File.

f, err := Open("")
if err != nil {
defer f.Close()

rs := f.Records(RecordsTimeOrder)
for rs.Next() {
	switch r := rs.Record.(type) {
	case *RecordSample:
		fmt.Printf("sample: %+v\n", r)
if err := rs.Err(); err != nil {




View Source
const (
	BreakpointOpR  BreakpointOp = 1
	BreakpointOpW               = 2
	BreakpointOpRW              = BreakpointOpR | BreakpointOpW
	BreakpointOpX               = 4
View Source
const (
	CallchainHV          uint64 = 0xffffffffffffffe0 // -32
	CallchainKernel             = 0xffffffffffffff80 // -128
	CallchainUser               = 0xfffffffffffffe00 // -512
	CallchainGuest              = 0xfffffffffffff800 // -2048
	CallchainGuestKernel        = 0xfffffffffffff780 // -2176
	CallchainGuestUser          = 0xfffffffffffff600 // -2560

Special markers used in RecordSample.Callchain to mark boundaries between types of stacks.

These correspond to PERF_CONTEXT_* from include/uapi/linux/perf_event.h


This section is empty.


This section is empty.


type AuxFlags

type AuxFlags uint64

AuxFlags gives flags for an RecordAux event.

const (
	// Record was truncated to fit in the ring buffer.
	AuxFlagTruncated AuxFlags = 1 << iota

	// AUX data was collected in overwrite mode, so the AUX buffer
	// was treated as a circular ring buffer.

	// Record contains gaps.

	// Sample collided with another.

func (AuxFlags) String

func (i AuxFlags) String() string

type AuxPMUFormat

type AuxPMUFormat uint8

AuxPMUFormat is the PMU specific trace format type. Values are architecture dependent.

const (
	// ARM
	AuxPMUFormatCoresightCoresight AuxPMUFormat = 0 // ARM Coresight format CORESIGHT.
	AuxPMUFormatCoresightRaw       AuxPMUFormat = 1 // ARM Coresight format RAW.

	AuxPMUFormatDefault AuxPMUFormat = 0

func (AuxPMUFormat) String

func (i AuxPMUFormat) String() string

type BPFEventFlags

type BPFEventFlags uint16

type BPFEventType

type BPFEventType uint16
const (
	BPFEventTypeUnknown BPFEventType = iota

func (BPFEventType) String

func (i BPFEventType) String() string

type BranchFlags

type BranchFlags uint64
const (
	// BranchFlagMispredicted indicates branch target was mispredicted.
	BranchFlagMispredicted BranchFlags = 1 << iota

	// BranchFlagPredicted indicates branch target was predicted.
	// In case predicted/mispredicted information is unavailable,
	// both flags will be unset.

	// BranchFlagInTransaction indicates the branch occurred in a
	// transaction.

	// BranchFlagAbort indicates the branch is a transaction abort.

func (BranchFlags) String

func (i BranchFlags) String() string

type BranchRecord

type BranchRecord struct {
	From, To uint64
	Flags    BranchFlags

	Cycles uint16 // Cycle count to last branch (or 0)

	// Type is the type of branch instruction that caused this
	// branch. If supported, this is set by the kernel by
	// disassembling the branch instruction, since the binary
	// itself may not be available at decoding time. This is only
	// set if EventAttr.BranchSampleType&BranchSampleTypeSave is
	// set in the event.
	Type BranchType

A BranchRecord records a single branching event in a sample.

type BranchSampleType

type BranchSampleType uint64

BranchSampleType is a bit-field of the types of branches to record in the branch stack.

This can include privilege levels to record, which can be different from the privilege levels of the event being sampled. If none of the privilege level bits are set, it defaults to the privilege levels of the event.

This corresponds to the perf_branch_sample_type enum from include/uapi/linux/perf_event.h

const (
	BranchSampleUser   BranchSampleType = 1 << iota // User branches
	BranchSampleKernel                              // Kernel branches
	BranchSampleHV                                  // Hypervisor branches

	BranchSampleAny       // Any branch types
	BranchSampleAnyCall   // Any call branch
	BranchSampleAnyReturn // Any return branch
	BranchSampleIndCall   // Indirect calls
	BranchSampleAbortTX   // Transaction aborts
	BranchSampleInTX      // In transaction
	BranchSampleNoTX      // Not in transaction
	BranchSampleCond      // Conditional branches

	BranchSampleCallStack // Call/ret stack
	BranchSampleIndJump   // Indirect jumps
	BranchSampleCall      // Direct call

	BranchSampleNoFlags  // Don't set BranchRecord.Flags
	BranchSampleNoCycles // Don't set BranchRecord.Cycles
	BranchSampleTypeSave // Do set BranchRecord.Type
	BranchSampleHWIndex  // Do set RecordSample.BranchHWIndex

func (BranchSampleType) String

func (i BranchSampleType) String() string

type BranchType

type BranchType uint8
const (
	BranchTypeUnknown  BranchType = iota // unknown
	BranchTypeCond                       // conditional
	BranchTypeUncond                     // unconditional
	BranchTypeInd                        // indirect
	BranchTypeCall                       // function call
	BranchTypeIndCall                    // indirect function call
	BranchTypeRet                        // function return
	BranchTypeSyscall                    // syscall
	BranchTypeSysret                     // syscall return
	BranchTypeCondCall                   // conditional function call
	BranchTypeCondRet                    // conditional function return
	BranchTypeEret                       // exception return
	BranchTypeIrq                        // interrupt

type BreakpointOp

type BreakpointOp uint32

BreakpointOp is a type of memory access that can trigger a breakpoint event.

This corresponds to the HW_BREAKPOINT_* constants from include/uapi/linux/hw_breakpoint.h

func (BreakpointOp) String

func (i BreakpointOp) String() string

type BuildID

type BuildID []byte

func (BuildID) String

func (b BuildID) String() string

type BuildIDInfo

type BuildIDInfo struct {
	CPUMode  CPUMode
	PID      int // Usually -1; for VM kernels
	BuildID  BuildID
	Filename string

A BuildIDInfo records the mapping between a single build ID and the path of an executable with that build ID.

type CPUMode

type CPUMode uint16

A CPUMode indicates the privilege level of a sample or event.

This corresponds to PERF_RECORD_MISC_CPUMODE from include/uapi/linux/perf_event.h

const (
	CPUModeUnknown CPUMode = iota

func (CPUMode) String

func (i CPUMode) String() string

type CPUSet

type CPUSet []int

A CPUSet represents a set of CPUs by CPU index.

func (CPUSet) String

func (c CPUSet) String() string

type Count

type Count struct {
	Value       uint64     // Event counter value
	TimeEnabled uint64     // if ReadFormatTotalTimeEnabled
	TimeRunning uint64     // if ReadFormatTotalTimeRunning
	EventAttr   *EventAttr // if ReadFormatID

A Count records the raw value of an event counter.

Typically only a subset of the fields are used. Which fields are set can be determined from the bitmask in the sample's EventAttr.ReadFormat.

This corresponds to perf_event_read_format from include/uapi/linux/perf_event.h

type DataSrc

type DataSrc struct {
	Op       DataSrcOp
	Miss     bool // if true, Level specifies miss, rather than hit
	Level    DataSrcLevel
	Snoop    DataSrcSnoop
	Locked   DataSrcLock
	TLB      DataSrcTLB
	LevelNum DataSrcLevelNum
	Remote   bool
	Block    DataSrcBlock
	Hops     DataSrcHops

type DataSrcBlock

type DataSrcBlock int
const (
	DataSrcBlockData DataSrcBlock = 1 << iota // Data could not be forwarded
	DataSrcBlockAddr                          // Address conflict

	DataSrcBlockNA DataSrcBlock = 0

func (DataSrcBlock) String

func (i DataSrcBlock) String() string

type DataSrcHops

type DataSrcHops int
const (
	DataSrcHopsCore   DataSrcHops = 1 // Remote core, same node
	DataSrcHopsNode   DataSrcHops = 3 // Remote node, same socket
	DataSrcHopsSocket DataSrcHops = 3 // Remote socket, same board
	DataSrcHopesBoard DataSrcHops = 4 // Remote board

	DataSrcHopsNA DataSrcHops = 0

func (DataSrcHops) String

func (i DataSrcHops) String() string

type DataSrcLevel

type DataSrcLevel int
const (
	DataSrcLevelL1  DataSrcLevel = 1 << iota
	DataSrcLevelLFB              // Line fill buffer
	DataSrcLevelLocalRAM     // Local DRAM
	DataSrcLevelRemoteRAM1   // Remote DRAM (1 hop)
	DataSrcLevelRemoteRAM2   // Remote DRAM (2 hops)
	DataSrcLevelRemoteCache1 // Remote cache (1 hop)
	DataSrcLevelRemoteCache2 // Remote cache (2 hops)
	DataSrcLevelIO           // I/O memory

	DataSrcLevelNA DataSrcLevel = 0

func (DataSrcLevel) String

func (i DataSrcLevel) String() string

type DataSrcLevelNum

type DataSrcLevelNum int
const (
	DataSrcLevelNumL1       DataSrcLevelNum = 0x01 // L1
	DataSrcLevelNumL2       DataSrcLevelNum = 0x02 // L2
	DataSrcLevelNumL3       DataSrcLevelNum = 0x03 // L3
	DataSrcLevelNumL4       DataSrcLevelNum = 0x04 // L4
	DataSrcLevelNumAnyCache DataSrcLevelNum = 0x0b // Any cache
	DataSrcLevelNumLFB      DataSrcLevelNum = 0x0c // LFB
	DataSrcLevelNumRAM      DataSrcLevelNum = 0x0d // RAM
	DataSrcLevelNumPMEM     DataSrcLevelNum = 0x0e // PMEM
	DataSrcLevelNumNA       DataSrcLevelNum = 0x0f // N/A

func (DataSrcLevelNum) String

func (i DataSrcLevelNum) String() string

type DataSrcLock

type DataSrcLock int
const (
	DataSrcLockNA DataSrcLock = iota

func (DataSrcLock) String

func (i DataSrcLock) String() string

type DataSrcOp

type DataSrcOp int
const (
	DataSrcOpLoad DataSrcOp = 1 << iota

	DataSrcOpNA DataSrcOp = 0

func (DataSrcOp) String

func (i DataSrcOp) String() string

type DataSrcSnoop

type DataSrcSnoop int
const (
	DataSrcSnoopNone DataSrcSnoop = 1 << iota
	DataSrcSnoopHitM // Snoop hit modified

	DataSrcSnoopNA DataSrcSnoop = 0

func (DataSrcSnoop) String

func (i DataSrcSnoop) String() string

type DataSrcTLB

type DataSrcTLB int
const (
	DataSrcTLBHit DataSrcTLB = 1 << iota

	DataSrcTLBNA DataSrcTLB = 0

func (DataSrcTLB) String

func (i DataSrcTLB) String() string

type Event

type Event interface {
	// Generic returns the generic representation of this Event.
	Generic() EventGeneric

Event describes a specific performance monitoring event.

Events are quite general. They can be hardware events such as cycles or cache misses. They can be kernel software events such as page faults. They can be user or kernel trace-points, or many other things. All events happen at some instant and can be counted.

type EventAttr

type EventAttr struct {
	// Event describes the event that will be (or was) counted or
	// sampled.
	Event Event

	// SamplePeriod, if non-zero, is the approximate number of
	// events between each sample.
	// For a sampled event, SamplePeriod will be set if
	// Flags&EventFlagsFreq == 0. See also SampleFreq.
	SamplePeriod uint64

	// SampleFreq, if non-zero, is the approximate number of
	// samples to record per second per core. This is approximated
	// by dynamically adjusting the event sampling period (see
	// perf_calculate_period) and thus is not particularly
	// accurate (and even less accurate for events that don't
	// happen at a regular rate). If SampleFormat includes
	// SampleFormatPeriod, each sample includes the number of
	// events until the next sample on the same CPU.
	// For a sampled event, SampleFreq will be set if
	// Flags&EventFlagsFreq != 0. See also SamplePeriod.
	SampleFreq uint64

	// The format of RecordSamples
	SampleFormat SampleFormat

	// The format of SampleRead
	ReadFormat ReadFormat

	Flags EventFlags

	// Precise indicates the precision of instruction pointers
	// recorded by this event.
	Precise EventPrecision

	// WakeupEvents specifies to wake up every WakeupEvents
	// events. Either this or WakeupWatermark will be non-zero,
	// depending on Flags&EventFlagWakeupWatermark.
	WakeupEvents uint32
	// WakeupWatermark specifies to wake up every WakeupWatermark
	// bytes.
	WakeupWatermark uint32

	// BranchSampleType specifies the types of branches to record
	// in the branch stack if SampleFormat&SampleFormatBranchStack
	// is set, as well as what information to record about each
	// branch.
	BranchSampleType BranchSampleType

	// SampleRegsUser is a bitmask of user-space registers
	// captured at each sample in RecordSample.RegsUser. The
	// hardware register corresponding to each bit depends on the
	// register ABI.
	SampleRegsUser uint64

	// Size of user stack to dump on samples
	SampleStackUser uint32

	// SampleRegsIntr is a bitmask of registers captured at each
	// sample in RecordSample.RegsIntr. If Precise ==
	// EventPrecisionArbitrarySkid, these registers are captured
	// at the PMU interrupt. Otherwise, these registers are
	// captured by the hardware when it samples an instruction.
	SampleRegsIntr uint64

	// AuxWatermark is the watermark for the AUX area in bytes at
	// which user space is woken up to collect the AUX area.
	AuxWatermark uint32

	// SampleMaxStack is the maximum number of frame pointers in a
	// callchain. Should be < /proc/sys/kernel/perf_event_max_stack.
	SampleMaxStack uint16

EventAttr describes an event and how that event should be recorded.

This corresponds to the perf_event_attr struct from include/uapi/linux/perf_event.h

type EventBreakpoint

type EventBreakpoint struct {
	// Op specifies what type of access to Addr should trigger
	// this event.
	Op BreakpointOp
	// Addr is the address to watch for operation Op.
	Addr uint64
	// Len is the number of bytes to watch at Addr. What sizes are
	// supported depends on the hardware, but it generally must be
	// a small power of 2.
	Len uint64

EventBreakpoint represents a breakpoint event.

Breakpoint events are triggered by a specific type of access to an address in memory.

func (EventBreakpoint) Generic

func (e EventBreakpoint) Generic() EventGeneric

type EventFlags

type EventFlags uint64

EventFlags is a bitmask of boolean properties of an event.

This corresponds to the perf_event_attr enum from include/uapi/linux/perf_event.h

const (
	// Event is disabled by default
	EventFlagDisabled EventFlags = 1 << iota
	// Children inherit this event
	// Event must always be on the PMU
	// Event is only group on PMU
	// Don't count events in user/kernel/hypervisor/when idle
	// Include mmap data
	// Include comm data
	// Use frequency, not period
	// Per task counts
	// Next exec enables this event
	// Trace fork/exit
	// WakeupWatermark is set rather than WakeupEvents.

	// Non-exec mmap data
	EventFlagMmapData EventFlags = 1 << (2 + iota)
	// All events have SampleField fields
	// Don't count events in host/guest
	// Don't include kernel/user callchains
	// Include inode data in mmap events
	// Flag comm events that are due to an exec
	// Use clock specified by clockid for time fields
	// Record context switch data. Enables RecordTypeSwitch and
	// RecordTypeSwitchCPUWide events.
	// Write ring buffer from end to beginning.
	// Include namespaces data.
	// Include ksymbol events.
	// Generate aux records instead of events.
	// Include cgroup events.
	// Include text poke events.
	// Use build ID in mmap2 events instead of inode.
	// Children only inherit if cloned with CLONE_THREAD.
	// Event is removed from task on exec.
	// Send synchronous SIGTRAP on event.

func (EventFlags) String

func (i EventFlags) String() string

type EventGeneric

type EventGeneric struct {
	// Type specifies the major type of this event, such as
	// hardware event, software event, or tracepoint.
	Type EventType

	// ID is the specific event within the class described by
	// Type.
	// In perf_event_attr, this corresponds to either
	// perf_event_attr.config or, if Type == EventTypeBreakpoint,
	// perf_event_attr.bp_type.
	ID uint64

	// Config gives additional configuration specific to the event
	// described by Type and ID.
	// In perf_event_attr, this corresponds to
	// perf_event_attr.config1 and config2.
	Config []uint64

EventGeneric is a generic representation of a performance event.

Any perf event can be represented by EventGeneric, but some encoding is generally necessary. Hence, EventGeneric can be translated back and forth between specific Event* types.

func (*EventGeneric) Decode

func (g *EventGeneric) Decode() Event

Decode decodes a generic event g into a specific event type.

type EventHWCache

type EventHWCache struct {
	Level     HWCache
	Op        HWCacheOp
	Result    HWCacheResult
	PMUTypeID uint32

EventHWCache represents a hardware cache event.

func (EventHWCache) Generic

func (e EventHWCache) Generic() EventGeneric

type EventHardware

type EventHardware struct {
	ID        EventHardwareID
	PMUTypeID PMUTypeID // Map back to name with FileMeta.PMUMappings

EventHardware represents a hardware event.

func (EventHardware) Generic

func (e EventHardware) Generic() EventGeneric

type EventHardwareID

type EventHardwareID uint8

EventHardwareID represents a hardware event type.

This corresponds to the perf_hw_id enum from include/uapi/linux/perf_event.h

const (
	EventHardwareIDCPUCycles EventHardwareID = iota

func (EventHardwareID) String

func (i EventHardwareID) String() string

type EventID

type EventID uint64

An EventID combined with an EventType describes a specific event.

type EventPrecision

type EventPrecision int

An EventPrecision indicates the precision of instruction pointers recorded by an event. This can vary depending on the exact method used to capture IPs.

const (
	EventPrecisionArbitrarySkid EventPrecision = iota

func (EventPrecision) String

func (i EventPrecision) String() string

type EventRaw

type EventRaw uint64

EventRaw represents a "raw" hardware PMU event in a CPU-specific format.

func (EventRaw) Generic

func (e EventRaw) Generic() EventGeneric

type EventSoftware

type EventSoftware uint64

EventSoftware represents a software event.

This corresponds to the perf_sw_ids enum from include/uapi/linux/perf_event.h

const (
	EventSoftwareCPUClock EventSoftware = iota

func (EventSoftware) Generic

func (e EventSoftware) Generic() EventGeneric

func (EventSoftware) String

func (i EventSoftware) String() string

type EventTracepoint

type EventTracepoint uint64

EventTracepoint represents a kernel tracepoint event.

The IDs of the tracepoint events are given by the tracing/events/*/*/id files under debugfs.

func (EventTracepoint) Generic

func (e EventTracepoint) Generic() EventGeneric

type EventType

type EventType uint32

An EventType is a general class of performance event.

This corresponds to the perf_type_id enum from include/uapi/linux/perf_event.h

const (
	EventTypeHardware EventType = iota

func (EventType) String

func (i EventType) String() string

type File

type File struct {
	// Meta contains the metadata for this profile, such as
	// information about the hardware.
	Meta FileMeta

	// Events lists all events that may appear in this profile.
	Events []*EventAttr
	// contains filtered or unexported fields

A File is a file. It consists of a sequence of records, which can be retrieved with the Records method, as well as several optional metadata fields.

func New

func New(r io.ReaderAt) (*File, error)

New reads a "" file from r.

The caller must keep r open as long as it is using the returned *File.

func Open

func Open(name string) (*File, error)

Open opens the named "" file using os.Open.

The caller must call f.Close() on the returned file when it is done.

func (*File) Close

func (f *File) Close() error

Close closes the File.

If the File was created using New directly instead of Open, Close has no effect.

func (*File) Records

func (f *File) Records(order RecordsOrder) *Records

Records returns an iterator over the records in the profile. The order argument specifies the order for iterating through the records in this File. Callers should choose the least resource-intensive iteration order that satisfies their needs.

type FileMeta

type FileMeta struct {
	// BuildIDs is the list of build IDs for processes and
	// libraries in this profile, or nil if unknown. Note that in
	// "live mode" (e.g., a file written by perf inject), it's
	// possible for build IDs to be introduced in the sample
	// stream itself.
	BuildIDs []BuildIDInfo

	// Hostname is the hostname of the machine that recorded this
	// profile, or "" if unknown.
	Hostname string

	// OSRelease is the OS release of the machine that recorded
	// this profile such as "3.13.0-62", or "" if unknown.
	OSRelease string

	// Version is the perf version that recorded this profile such
	// as "3.13.11", or "" if unknown.
	Version string

	// Arch is the host architecture of the machine that recorded
	// this profile such as "x86_64", or "" if unknown.
	Arch string

	// CPUsOnline and CPUsAvail are the number of online and
	// available CPUs of the machine that recorded this profile,
	// or 0, 0 if unknown.
	CPUsOnline, CPUsAvail int

	// CPUDesc describes the CPU of the machine that recorded this
	// profile such as "Intel(R) Core(TM) i7-4600U CPU @ 2.10GHz",
	// or "" if unknown.
	CPUDesc string

	// CPUID describes the CPU type of the machine that recorded
	// this profile, or "" if unknown. The exact format of this
	// varies between architectures. On x86 architectures, it is a
	// comma-separated list of vendor, family, model, and
	// stepping, such as "GenuineIntel,6,69,1".
	CPUID string

	// TotalMem is the total memory in bytes of the machine that
	// recorded this profile, or 0 if unknown.
	TotalMem int64

	// CmdLine is the list of command line arguments perf was
	// invoked with, or nil if unknown.
	CmdLine []string

	// CoreGroups and ThreadGroups describe the CPU topology of
	// the machine that recorded this profile. Each CPUSet in
	// CoreGroups is a set of CPUs in the same package, and each
	// CPUSet in ThreadGroups is a set of hardware threads in the
	// same core. These will be nil if unkneon.
	CoreGroups, ThreadGroups []CPUSet

	// NUMANodes is the set of NUMA nodes in the NUMA topology of
	// the machine that recorded this profile, or nil if unknown.
	NUMANodes []NUMANode

	// PMUMappings is a map from numerical PMUTypeID to name for
	// event classes supported by the machine that recorded this
	// profile, or nil if unknown.
	PMUMappings map[PMUTypeID]string

	// Groups is the descriptions of each perf event group in this
	// profile, or nil if unknown.
	Groups []GroupDesc

type GroupDesc

type GroupDesc struct {
	Name       string
	Leader     int
	NumMembers int

A GroupDesc describes a group of PMU events that are scheduled together.

TODO: Are Leader and NumMembers attribute IDs? If so, we should probably map them to *EventAttrs to make this useful.

type HWCache

type HWCache uint8

HWCache represents a level in the hardware cache.

This corresponds to the perf_hw_cache_id enum from include/uapi/linux/perf_event.h

const (
	HWCacheL1D HWCache = iota

func (HWCache) String

func (i HWCache) String() string

type HWCacheOp

type HWCacheOp uint8

HWCacheOp represents a type of access to a hardware cache.

This corresponds to the perf_hw_cache_op_id enum from include/uapi/linux/perf_event.h

const (
	HWCacheOpRead HWCacheOp = iota

func (HWCacheOp) String

func (i HWCacheOp) String() string

type HWCacheResult

type HWCacheResult uint8

HWCacheResult represents the result of a accessing a hardware cache.

This corresponds to the perf_hw_cache_op_result_id enum from include/uapi/linux/perf_event.h

const (
	HWCacheResultAccess HWCacheResult = iota

func (HWCacheResult) String

func (i HWCacheResult) String() string

type KsymbolFlags

type KsymbolFlags uint64

KsymbolFlags gives flags for a RecordKsymbol event.

const (
	// Ksymbol was unregistered.
	KsymbolFlagUnregister KsymbolFlags = iota

func (KsymbolFlags) String

func (i KsymbolFlags) String() string

type KsymbolType

type KsymbolType uint16
const (
	KsymbolTypeUnknown KsymbolType = iota

func (KsymbolType) String

func (i KsymbolType) String() string

type NUMANode

type NUMANode struct {
	// Node is the system identifier of this NUMA node.
	Node int

	// MemTotal and MemFree are the total and free number of bytes
	// of memory in this NUMA node.
	MemTotal, MemFree int64

	// CPUs is the set of CPUs in this NUMA node.

A NUMANode represents a single hardware NUMA node.

type Namespace

type Namespace struct {
	Dev, Inode uint64

type PMUTypeID

type PMUTypeID uint32

PMUTypeID is a kernel-assigned type id assigned on PMU registration, visible at /sys/bus/event_source/devices/$PMU/type.

type ReadFormat

type ReadFormat uint64

ReadFormat is a bitmask of the fields recorded in the SampleRead field(s) of a sample.

This corresponds to the perf_event_read_format enum from include/uapi/linux/perf_event.h

const (
	ReadFormatTotalTimeEnabled ReadFormat = 1 << iota

func (ReadFormat) String

func (i ReadFormat) String() string

type Record

type Record interface {
	Type() RecordType
	Common() *RecordCommon

Record is the common interface implemented by all profile record types.

type RecordAux

type RecordAux struct {

	Offset, Size uint64
	Flags        AuxFlags
	PMUFormat    AuxPMUFormat

A RecordAux records the data was added to the AUX buffer.

func (*RecordAux) Type

func (r *RecordAux) Type() RecordType

type RecordAuxOutputHardwareID

type RecordAuxOutputHardwareID struct {

	ID uint64

RecordAuxOutputHardwareID records an archtecture-specific hardware ID assosciated with the aux data for this event ID.

e.g., this is used to disambiguate different PEBS event types from each other when using PEBS-via-PT.

func (*RecordAuxOutputHardwareID) Type

type RecordAuxtrace

type RecordAuxtrace struct {
	// TID and CPU are always filled in.

	// Offset is the byte offset of the aux data in the aux mmap.
	// Not meaningful in perf data files.
	Offset uint64

	// Ref is a unique identifier for this auxtrace block.
	// TODO: What's the point of this? Is it cross-referenced
	// against something?
	Ref uint64

	// Idx is the index of the aux mmap region of this data.
	// Not meaningful in perf data files.
	Idx uint32

	// Data is the raw auxiliary data. The encoding of this
	// depends on the latest RecordAuxtraceInfo.
	Data []byte

func (*RecordAuxtrace) Type

func (r *RecordAuxtrace) Type() RecordType

type RecordAuxtraceInfo

type RecordAuxtraceInfo struct {

	Kind uint32

	Priv []uint64

func (*RecordAuxtraceInfo) Type

func (r *RecordAuxtraceInfo) Type() RecordType

type RecordBPFEvent

type RecordBPFEvent struct {

	EventType BPFEventType
	Flags     BPFEventFlags
	ID        uint32
	Tag       uint64

RecordBPFEvent records BPF program load/unload information.

func (*RecordBPFEvent) Type

func (r *RecordBPFEvent) Type() RecordType

type RecordCGroup

type RecordCGroup struct {

	ID   uint32
	Path string

RecordCGroup records the assosciation between a cgroup id and path.

func (*RecordCGroup) Type

func (r *RecordCGroup) Type() RecordType

type RecordComm

type RecordComm struct {
	// RecordCommon.PID and .TID will always be filled

	Exec bool // from header.misc

	Comm string

A RecordComm records that a process being profiled called exec. RecordComms can also occur at the beginning of a profile to describe the existing set of processes.

func (*RecordComm) Type

func (r *RecordComm) Type() RecordType

type RecordCommon

type RecordCommon struct {
	// Offset is the byte offset of this event in the
	// file.
	Offset int64

	// Format is a bit mask of SampleFormat* values that indicate
	// which optional fields of this record are valid.
	Format SampleFormat

	// EventAttr is the event, if any, associated with this record.
	EventAttr *EventAttr

	PID, TID int    // if SampleFormatTID
	Time     uint64 // if SampleFormatTime
	ID       attrID // if SampleFormatID or SampleFormatIdentifier
	StreamID uint64 // if SampleFormatStreamID
	CPU, Res uint32 // if SampleFormatCPU

RecordCommon stores fields that are common to all record types, as well as additional metadata. It is not itself a Record.

Many fields are optional and their presence is determined by the bitmask EventAttr.SampleFormat. Some record types guarantee that some of these fields will be filled.

func (*RecordCommon) Common

func (r *RecordCommon) Common() *RecordCommon

type RecordExit

type RecordExit struct {
	// RecordCommon.PID, .TID, and .Time will always be filled


A RecordExit records that a process or thread exited.

func (*RecordExit) Type

func (r *RecordExit) Type() RecordType

type RecordFork

type RecordFork struct {
	// RecordCommon.PID, .TID, and .Time will always be filled


A RecordFork records that a process called clone to either fork the process or create a new thread.

func (*RecordFork) Type

func (r *RecordFork) Type() RecordType

type RecordItraceStart

type RecordItraceStart struct {
	// PID and TID will always be filled in.

A RecordItraceStart indicates that an instruction trace started.

func (*RecordItraceStart) Type

func (r *RecordItraceStart) Type() RecordType

type RecordKsymbol

type RecordKsymbol struct {

	Addr     uint64
	Len      uint32
	KsymType KsymbolType
	Flags    KsymbolFlags
	Name     string

RecordKsymbol record kernel symbol register/unregister information, for dynamically loaded or JITed kernel functions.

func (*RecordKsymbol) Type

func (r *RecordKsymbol) Type() RecordType

type RecordLost

type RecordLost struct {
	// RecordCommon.ID and .EventAttr will always be filled

	NumLost uint64

A RecordLost records that profiling events were lost because of a buffer overflow.

func (*RecordLost) Type

func (r *RecordLost) Type() RecordType

type RecordLostSamples

type RecordLostSamples struct {

	Lost uint64

A RecordLostSamples records the number of dropped or lost samples.

func (*RecordLostSamples) Type

func (r *RecordLostSamples) Type() RecordType

type RecordMmap

type RecordMmap struct {
	// RecordCommon.PID and .TID will always be filled

	Data bool // from header.misc

	// Addr and Len are the virtual address of the start of this
	// mapping and its length in bytes.
	Addr, Len uint64
	// FileOffset is the byte offset in the mapped file of the
	// beginning of this mapping.
	FileOffset uint64

	Major, Minor       uint32 // if !EventFlagBuildID
	Ino, InoGeneration uint64 // if !EventFlagBuildID

	BuildID []byte // if EventFlagBuildID

	Prot, Flags uint32
	Filename    string

A RecordMmap records when a process being profiled called mmap. RecordMmaps can also occur at the beginning of a profile to describe the existing memory layout.

func (*RecordMmap) Type

func (r *RecordMmap) Type() RecordType

type RecordNamespaces

type RecordNamespaces struct {
	// PID and TID are always filled in.

	Namespaces []Namespace

func (*RecordNamespaces) Type

func (r *RecordNamespaces) Type() RecordType

type RecordSample

type RecordSample struct {
	// RecordCommon.EventAttr will always be filled.
	// RecordCommon.Format descibes the optional fields in this
	// structure, as well as the optional common fields.

	CPUMode CPUMode // from header.misc
	ExactIP bool    // from header.misc

	IP   uint64 // if SampleFormatIP
	Addr uint64 // if SampleFormatAddr

	// Period is the number of events on this CPU until the next
	// sample. In frequency sampling mode, this is adjusted
	// dynamically based on the rate of recent events. In period
	// sampling mode, this is fixed.
	Period uint64 // if SampleFormatPeriod

	// SampleRead records raw event counter values. If this is an
	// event group, this slice will have more than one element;
	// otherwise, it will have one element.
	SampleRead []Count // if SampleFormatRead

	// Callchain gives the call stack of the sampled instruction,
	// starting from the sampled instruction itself. The call
	// chain may span several types of stacks (e.g., it may start
	// in a kernel stack, then transition to a user stack). Before
	// the first IP from each stack there will be a Callchain*
	// constant indicating the stack type for the following IPs.
	Callchain []uint64 // if SampleFormatCallchain

	// BranchHWIndex is the low level index of the raw hardware branch
	// record (e.g., LBR) for BranchStack[0].
	// BranchStack is an abstraction of the raw hardware branch records,
	// and the index of the raw entry can be very useful for stitching the
	// stacks of multiple samples to reconstruct the call stack.
	// The value is between -1 (unknown) and the max depth from
	// /sys/devices/cpu/caps/branches.
	BranchHWIndex int64 // if BranchSampleHWIndex

	BranchStack []BranchRecord // if SampleFormatBranchStack

	// RegsUserABI and RegsUser record the ABI and values of
	// user-space registers as of this sample. Note that these are
	// the current user-space registers even if this sample
	// occurred at a kernel PC. RegsUser[i] records the value of
	// the register indicated by the i-th set bit of
	// EventAttr.SampleRegsUser.
	RegsUserABI SampleRegsABI // if SampleFormatRegsUser
	RegsUser    []uint64      // if SampleFormatRegsUser

	// RegsIntrABI And RegsIntr record the ABI and values of
	// registers as of this sample. Unlike RegsUser, these can be
	// kernel-space registers if this sample occurs in the kernel.
	// RegsIntr[i] records the value of the register indicated by
	// the i-th set bit of EventAttr.SampleRegsIntr.
	RegsIntrABI SampleRegsABI // if SampleFormatRegsIntr
	RegsIntr    []uint64      // if SampleFormatRegsIntr

	StackUser        []byte // if SampleFormatStackUser
	StackUserDynSize uint64 // if SampleFormatStackUser

	Weight  uint64  // if SampleFormatWeight or SampleFormatWeightStruct
	Weights Weights // if SampleFormatWeightStruct

	DataSrc DataSrc // if SampleFormatDataSrc

	Transaction Transaction // if SampleFormatTransaction
	AbortCode   uint32      // if SampleFormatTransaction

	PhysAddr uint64 // if SampleFormatPhysAddr

	CGroup uint64 // if SampleFormatCGroup

	DataPageSize uint64 // if SampleFormatDataPageSize
	CodePageSize uint64 // if SampleFormatCodePageSize

	Aux []byte // if SampleFormatAux

A RecordSample records a profiling sample event.

Typically only a subset of the fields are used. Which fields are set can be determined from the bitmask RecordSample.EventAttr.SampleFormat.

func (*RecordSample) Fields

func (r *RecordSample) Fields() []string

Fields returns the list of names of valid fields in r based on r.Format. This is useful for writing custom printing functions.

func (*RecordSample) String

func (r *RecordSample) String() string

func (*RecordSample) Type

func (r *RecordSample) Type() RecordType

type RecordSwitch

type RecordSwitch struct {

	// Out indicates this is a switch out. Otherwise, this is a
	// switch in.
	Out bool

A RecordSwitch records a context switch in or out of the monitored process. See also RecordSwitchCPUWide.

func (*RecordSwitch) Type

func (r *RecordSwitch) Type() RecordType

type RecordSwitchCPUWide

type RecordSwitchCPUWide struct {

	// Out indicates this is a switch out. Otherwise, this is a
	// switch in.
	Out bool

	// Preempt indicates that the preempted thread was in
	// TASK_RUNNING state. That is, this was an involuntary
	// preemption.
	Preempt bool

	// SwitchPID and SwitchTID are the PID and TID of the process
	// being switched in or switched out.
	SwitchPID, SwitchTID int

RecordSwitchCPUWide is a CPU-wide version of RecordSwitch.

func (*RecordSwitchCPUWide) Type

func (r *RecordSwitchCPUWide) Type() RecordType

type RecordTextPoke

type RecordTextPoke struct {

	Addr uint64
	Old  []byte
	New  []byte

RecordTextPoke records single instruction changes to the kernel text. This event records the address modified and the old and new code.

func (*RecordTextPoke) Type

func (r *RecordTextPoke) Type() RecordType

type RecordThrottle

type RecordThrottle struct {
	// RecordCommon.Time, .ID, and .StreamID, and .EventAttr will
	// always be filled

	Enable bool

A RecordThrottle records that interrupt throttling was enabled or disabled.

func (*RecordThrottle) Type

func (r *RecordThrottle) Type() RecordType

type RecordType

type RecordType uint32

A RecordType indicates the type of a record in a profile. A record can either be a profiling sample or give information about changes to system state, such as a process calling mmap.

const (
	RecordTypeMmap RecordType = 1 + iota

	RecordTypeLostSamples // TODO: How does this differ from RecordTypeLost?
const (
	RecordTypeAuxtraceInfo RecordType // TODO
	RecordTypeAuxtraceError // TODO


perf_user_event_type in tools/perf/util/event.h

TODO: Figure out what to do with these. Some of these are only to direct parsing so they should never escape the API. Some of these are only for pipes.

func (RecordType) String

func (i RecordType) String() string

type RecordUnknown

type RecordUnknown struct {

	Data []byte
	// contains filtered or unexported fields

A RecordUnknown is a Record of unknown or unimplemented type.

func (*RecordUnknown) Type

func (r *RecordUnknown) Type() RecordType

type Records

type Records struct {
	// The current record. The concrete type of this will be one
	// of the Record* types. Determine which type of record this
	// is using a type switch.
	Record Record
	// contains filtered or unexported fields

A Records is an iterator over the records in a "" file. Each record will be one of the Record* types.

Typical usage is

rs := file.Records()
for rs.Next() {
  switch r := rs.Record.(type) {
  case *perffile.RecordSample:
if rs.Err() { ... }

func (*Records) Err

func (r *Records) Err() error

Err returns the first error encountered by Records.

func (*Records) Next

func (r *Records) Next() bool

Next fetches the next record into r.Record. It returns true if successful, and false if it reaches the end of the record stream or encounters an error.

The record stored in r.Record may be reused by later invocations of Next, so if the caller may need the record after another call to Next, it must make its own copy.

type RecordsOrder

type RecordsOrder int
const (
	// RecordsFileOrder requests records in file order. This is
	// efficient because it allows streaming the records directly
	// from the file, but the records may not be in time-stamp or
	// even causal order.
	RecordsFileOrder RecordsOrder = iota

	// RecordsCausalOrder requests records in causal order. This
	// is weakly time-ordered: any two records will be in
	// time-stamp order *unless* those records are both
	// RecordSamples. This is potentially more efficient than
	// RecordsTimeOrder, though currently the implementation does
	// not distinguish.

	// RecordsTimeOrder requests records in time-stamp order. This
	// is the most expensive iteration order because it requires
	// buffering and/or re-reading potentially large sections of
	// the input file in order to sort the records.

func (RecordsOrder) String

func (i RecordsOrder) String() string

type SampleFormat

type SampleFormat uint64

A SampleFormat is a bitmask of the fields recorded by a sample.

This corresponds to the perf_event_sample_format enum from include/uapi/linux/perf_event.h

const (
	SampleFormatIP SampleFormat = 1 << iota

func (SampleFormat) String

func (i SampleFormat) String() string

type SampleRegsABI

type SampleRegsABI uint64

SampleRegsABI indicates the register ABI of a given sample for architectures that support multiple ABIs.

This corresponds to the perf_sample_regs_abi enum from include/uapi/linux/perf_event.h

const (
	SampleRegsABINone SampleRegsABI = iota

func (SampleRegsABI) String

func (i SampleRegsABI) String() string

type Transaction

type Transaction int
const (
	TransactionElision       Transaction = 1 << iota // From elision
	TransactionTransaction                           // From transaction
	TransactionSync                                  // Instruction is related
	TransactionAsync                                 // Instruction is not related
	TransactionRetry                                 // Retry possible
	TransactionConflict                              // Conflict abort
	TransactionCapacityWrite                         // Capactiy write abort
	TransactionCapacityRead                          // Capactiy read abort

func (Transaction) String

func (i Transaction) String() string

type Weights

type Weights struct {
	Var1 uint32
	Var2 uint16
	Var3 uint16

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