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package internal
import "C"
import (
"fmt"
"reflect"
"time"
"ior/internal/event"
"ior/internal/file"
"ior/internal/globalfilter"
"ior/internal/types"
)
const sysEnterNameToHandleAtName = "name_to_handle_at"
const (
defaultCommLookupWorkers = 4
defaultCommLookupQueueSize = 512
defaultMaxPendingEnterEvs = 16384
defaultMaxProcFdCacheSize = 8192
cacheTrimDivisor = 4
)
type eventLoopConfig struct {
pidFilter int
filter globalfilter.Filter
collapsedFields []string
countField string
pprofEnable bool
plainMode bool
// synchronousRawProcessing keeps raw decode and callback emission in a
// single goroutine for deterministic test execution.
synchronousRawProcessing bool
fdTracker *fdTracker
commResolver *commResolver
}
type rawEventHandler func(raw []byte, ch chan<- *event.Pair)
type tracepointExitHandler func(ep *event.Pair) bool
type eventLoop struct {
filter globalfilter.Filter
enterEvs map[uint32]*event.Pair // Temp. store of sys_enter tracepoints per Tid.
enterEvAges map[uint32]uint64
pendingHandles map[uint32]string // map of TID to pathname from name_to_handle_at
fdTracker *fdTracker
procFdCache map[uint64]*file.FdFile // Cache procfs-resolved metadata for unknown fds.
procFdCacheAges map[uint64]uint64
commResolver *commResolver
prevPairTimes map[uint32]uint64 // Previous event's time (to calculate time differences between two events)
rawHandlers map[types.EventType]rawEventHandler
exitHandlers map[reflect.Type]tracepointExitHandler
printCb func(ep *event.Pair) // Callback to print the event
warningCb func(message string) // Optional callback for non-fatal event processing warnings
cfg eventLoopConfig
cacheAge uint64
maxPendingEnterEvs int
maxProcFdCacheSize int
// Statistics
numTracepoints uint
numTracepointMismatches uint
numSyscalls uint
numSyscallsAfterFilter uint
startTime time.Time
done chan struct{}
}
func newEventLoop(cfg eventLoopConfig) (*eventLoop, error) {
fdState := configuredFDTracker(cfg.fdTracker)
commState := configuredCommResolver(cfg.commResolver)
if err := cfg.filter.ValidateTracepointFields(); err != nil {
return nil, fmt.Errorf("create event filter: %w", err)
}
el := &eventLoop{
filter: cfg.filter.Clone(),
enterEvs: make(map[uint32]*event.Pair),
enterEvAges: make(map[uint32]uint64),
pendingHandles: make(map[uint32]string),
fdTracker: fdState,
procFdCache: make(map[uint64]*file.FdFile),
procFdCacheAges: make(map[uint64]uint64),
commResolver: commState,
prevPairTimes: make(map[uint32]uint64),
rawHandlers: make(map[types.EventType]rawEventHandler),
exitHandlers: make(map[reflect.Type]tracepointExitHandler),
printCb: func(ep *event.Pair) { fmt.Println(ep); ep.Recycle() },
cfg: cfg,
done: make(chan struct{}),
}
el.initRawHandlers()
el.initExitHandlers()
el.configureOutputCallback()
el.seedTrackedPidComm()
return el, nil
}
func configuredFDTracker(injected *fdTracker) *fdTracker {
if injected == nil {
return newFDTracker(nil)
}
if injected.files == nil {
injected.files = make(map[int32]file.File)
}
return injected
}
func configuredCommResolver(injected *commResolver) *commResolver {
if injected == nil {
return newCommResolver(nil)
}
if injected.comms == nil {
injected.comms = make(map[uint32]string)
}
if injected.pending == nil {
injected.pending = make(map[uint32]struct{})
}
injected.ensureLookupConfig()
return injected
}
func (e *eventLoop) seedTrackedPidComm() {
e.commState().seedTrackedPidComm(e.cfg.pidFilter)
}
func (e *eventLoop) fdState() *fdTracker {
if e.fdTracker == nil {
e.fdTracker = newFDTracker(nil)
}
if e.fdTracker.files == nil {
e.fdTracker.files = make(map[int32]file.File)
}
return e.fdTracker
}
func (e *eventLoop) commState() *commResolver {
if e.commResolver == nil {
e.commResolver = newCommResolver(nil)
}
if e.commResolver.comms == nil {
e.commResolver.comms = make(map[uint32]string)
}
if e.commResolver.pending == nil {
e.commResolver.pending = make(map[uint32]struct{})
}
e.commResolver.ensureLookupConfig()
return e.commResolver
}
func (e *eventLoop) configureOutputCallback() {
switch {
case e.cfg.pprofEnable:
e.printCb = func(ep *event.Pair) {
ep.Recycle()
}
}
}
func (e *eventLoop) stats() string {
fmt.Println("Waiting for stats to be ready")
<-e.done
duration := time.Since(e.startTime)
stats := fmt.Sprintf(
"Statistics:\n"+
"\tduration: %v\n"+
"\ttracepoints: %v (%.2f/s) with %d mismatches (%.2f%%)\n"+
"\tsyscalls: %d (%.2f/s)\n"+
"\tsyscalls after filter: %d (%.2f/s)\n",
duration,
e.numTracepoints, float64(e.numTracepoints)/duration.Seconds(), e.numTracepointMismatches, (float64(e.numTracepointMismatches)/float64(e.numTracepoints))*100,
e.numSyscalls, float64(e.numSyscalls)/duration.Seconds(),
e.numSyscallsAfterFilter, float64(e.numSyscallsAfterFilter)/duration.Seconds(),
)
return stats
}
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