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proc,service: expose goroutine pprof labels in api

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Labels can help in identifying a particular goroutine during debugging.

Fixes #1763
This commit is contained in:
Dmitry Neverov
2020-01-18 09:18:44 +01:00
committed by Derek Parker
parent 1ac990c705
commit ca3fe88899
5 changed files with 71 additions and 0 deletions
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24
pkg/proc/variables.go
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@ -210,6 +210,8 @@ type G struct {
variable *Variable
Unreadable error // could not read the G struct
Labels map[string]string // G's pprof labels
}
// Defer returns the top-most defer of the goroutine.
@ -558,6 +560,27 @@ func (v *Variable) parseG() (*G, error) {
status, _ := constant.Int64Val(v.fieldVariable("atomicstatus").Value)
f, l, fn := v.bi.PCToLine(uint64(pc))
var labels map[string]string
if labelsVar := v.loadFieldNamed("labels"); labelsVar != nil && len(labelsVar.Children) == 1 {
if address := labelsVar.Children[0]; address.Addr != 0 {
labelMapType, _ := v.bi.findType("runtime/pprof.labelMap")
if labelMapType != nil {
labelMap := newVariable("", address.Addr, labelMapType, v.bi, v.mem)
labelMap.loadValue(loadFullValue)
labels = map[string]string{}
// iterate through map as it is done in other places
for i := range labelMap.Children {
if i % 2 == 0 {
k := labelMap.Children[i]
v := labelMap.Children[i+1]
labels[constant.StringVal(k.Value)] = constant.StringVal(v.Value)
}
}
}
}
}
g := &G{
ID: int(id),
GoPC: uint64(gopc),
@ -573,6 +596,7 @@ func (v *Variable) parseG() (*G, error) {
stkbarPos: int(stkbarPos),
stackhi: stackhi,
stacklo: stacklo,
Labels: labels,
}
return g, nil
}