elf.go

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// elfBuildID returns the GNU build ID of the named ELF binary,
// without introducing a dependency on debug/elf and its dependencies.
func elfBuildID(file string) (string, error)

返回ELF二进制文件的GNU build ID

label.go

通过 context.Context 上操作kv值,达到设置 label的目的

map.go

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// A profMap is a map from (stack, tag) to mapEntry.
// It grows without bound, but that's assumed to be OK.
type profMap struct {
	hash    map[uintptr]*profMapEntry
	all     *profMapEntry
	last    *profMapEntry
	free    []profMapEntry
	freeStk []uintptr
}

// A profMapEntry is a single entry in the profMap.
type profMapEntry struct {
	nextHash *profMapEntry // next in hash list
	nextAll  *profMapEntry // next in list of all entries
	stk      []uintptr
	tag      unsafe.Pointer
	count    int64
}

func (m *profMap) lookup(stk []uint64, tag unsafe.Pointer) *profMapEntry

大概是标签查找

pprof.go

  1. 定义了Profile

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    type Profile struct {
    	name  string
    	mu    sync.Mutex
    	m     map[interface{}][]uintptr
    	count func() int
    	write func(io.Writer, int) error
    }

  2. 初始化了一些Profile

    goroutine,threadcreate,heap,allocs,block,mutex

  3. 提供 NewProfile(name string) 方法支持自定义生成

  4. func (p *Profile) Add(value interface{}, skip int)

    将和value相关的执行栈加入到profile.Add在内部实现的map中存储value,所以value必须是可以被用作map的key,而且在没有收到移除(Remove)指令前不会被自动gc掉.

  5. writexxx

proto.go

基本是构建pprof文件信息的方法

protobuf.go

编码,buffer

protomem.go

runtime.go

标记当前线程

internal子包

为了给外部调用,里面多封了一层profile包

  1. encode.go

    对Profile的编解码

  2. filter.go

    过滤

  3. legacy_profile.go
  4. profile.go
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    // Profile is an in-memory representation of profile.proto.
    type Profile struct {
    	SampleType        []*ValueType
    	DefaultSampleType string
    	Sample            []*Sample
    	Mapping           []*Mapping
    	Location          []*Location
    	Function          []*Function
    	Comments          []string

    	DropFrames string
    	KeepFrames string

    	TimeNanos     int64
    	DurationNanos int64
    	PeriodType    *ValueType
    	Period        int64

    	commentX           []int64
    	dropFramesX        int64
    	keepFramesX        int64
    	stringTable        []string
    	defaultSampleTypeX int64
    }

profile.proto文件的内存信息