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proc.go
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proc.go
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package symtab
import (
"fmt"
"os"
"path"
"slices"
"strconv"
"strings"
"github.com/grafana/pyroscope/ebpf/symtab/elf"
"github.com/go-kit/log"
"github.com/go-kit/log/level"
"github.com/pkg/errors"
)
type ProcTable struct {
logger log.Logger
ranges []elfRange
file2Table map[file]*ElfTable
options ProcTableOptions
rootFS string
err error
}
type ProcTableDebugInfo struct {
ElfTables map[string]elf.SymTabDebugInfo `alloy:"elfs,block,optional" river:"elfs,block,optional"`
Size int `alloy:"size,attr,optional" river:"size,attr,optional"`
Pid int `alloy:"pid,attr,optional" river:"pid,attr,optional"`
LastUsedRound int `alloy:"last_used_round,attr,optional" river:"last_used_round,attr,optional"`
}
func (p *ProcTable) DebugInfo() ProcTableDebugInfo {
res := ProcTableDebugInfo{
Pid: p.options.Pid,
Size: len(p.file2Table),
ElfTables: make(map[string]elf.SymTabDebugInfo),
}
for f, e := range p.file2Table {
d := e.table.DebugInfo()
if d.Size != 0 {
res.ElfTables[fmt.Sprintf("%x %x %s", f.dev, f.inode, f.path)] = d
}
}
return res
}
type ProcTableOptions struct {
Pid int
ElfTableOptions
}
func NewProcTable(logger log.Logger, options ProcTableOptions) *ProcTable {
return &ProcTable{
logger: logger,
file2Table: make(map[file]*ElfTable),
options: options,
rootFS: path.Join("/proc", strconv.Itoa(options.Pid), "root"),
}
}
type elfRange struct {
mapRange *ProcMap
// may be nil
elfTable *ElfTable
}
func (p *ProcTable) Refresh() {
if p.err != nil {
return
}
procMaps, err := os.ReadFile(fmt.Sprintf("/proc/%d/maps", p.options.Pid))
if err != nil {
if !errors.Is(err, os.ErrNotExist) {
level.Error(p.logger).Log("msg", "failed to read /proc/pid/maps", "err", err)
}
p.options.Metrics.ProcErrors.WithLabelValues(errorType(err)).Inc()
p.err = err
return
}
p.err = p.refreshProcMap(procMaps)
if p.err != nil {
_ = level.Error(p.logger).Log("err", p.err)
} else {
}
}
func (p *ProcTable) Error() error {
return p.err
}
func (p *ProcTable) refreshProcMap(procMaps []byte) error {
// todo support perf map files
for i := range p.ranges {
p.ranges[i].elfTable = nil
}
p.ranges = p.ranges[:0]
filesToKeep := make(map[file]struct{})
maps, err := ParseProcMapsExecutableModules(procMaps, true)
if err != nil {
return err
}
for _, m := range maps {
p.ranges = append(p.ranges, elfRange{
mapRange: m,
})
r := &p.ranges[len(p.ranges)-1]
e := p.getElfTable(r)
if e != nil {
r.elfTable = e
filesToKeep[r.mapRange.file()] = struct{}{}
}
}
var filesToDelete []file
for f := range p.file2Table {
_, keep := filesToKeep[f]
if !keep {
filesToDelete = append(filesToDelete, f)
}
}
for _, f := range filesToDelete {
delete(p.file2Table, f)
}
return nil
}
func (p *ProcTable) getElfTable(r *elfRange) *ElfTable {
f := r.mapRange.file()
e, ok := p.file2Table[f]
if !ok {
e = p.createElfTable(r.mapRange)
if e != nil {
p.file2Table[f] = e
}
}
return e
}
func (p *ProcTable) Resolve(pc uint64) Symbol {
if pc == 0xcccccccccccccccc || pc == 0x9090909090909090 {
return Symbol{Start: 0, Name: "end_of_stack", Module: "[unknown]"}
}
i, found := slices.BinarySearchFunc(p.ranges, pc, binarySearchElfRange)
if !found {
return Symbol{}
}
r := p.ranges[i]
t := r.elfTable
if t == nil {
return Symbol{}
}
s := t.Resolve(pc)
moduleOffset := pc - t.base
if s == "" {
return Symbol{Start: moduleOffset, Module: r.mapRange.Pathname}
}
return Symbol{Start: moduleOffset, Name: s, Module: r.mapRange.Pathname}
}
func (p *ProcTable) createElfTable(m *ProcMap) *ElfTable {
if !strings.HasPrefix(m.Pathname, "/") {
return nil
}
e := NewElfTable(p.logger, m, p.rootFS, m.Pathname, p.options.ElfTableOptions)
return e
}
func (p *ProcTable) Cleanup() {
for _, table := range p.file2Table {
table.Cleanup()
}
}
func (p *ProcTable) Pid() int {
return p.options.Pid
}
func binarySearchElfRange(e elfRange, pc uint64) int {
if pc < e.mapRange.StartAddr {
return 1
}
if pc >= e.mapRange.EndAddr {
return -1
}
return 0
}