diff --git a/trace.go b/trace.go
index 15d8323..124e107 100644
--- a/trace.go
+++ b/trace.go
@@ -1,17 +1,171 @@
 package rcmgr
 
 import (
+	"compress/gzip"
+	"context"
+	"encoding/json"
+	"io"
+	"os"
+	"sync"
+	"time"
+
 	"github.com/libp2p/go-libp2p-core/network"
 )
 
-type trace struct{}
+type trace struct {
+	path string
+
+	ctx    context.Context
+	cancel func()
+	closed chan struct{}
+
+	mx   sync.Mutex
+	done bool
+	pend []interface{}
+}
+
+func WithTrace(path string) Option {
+	return func(r *resourceManager) error {
+		r.trace = &trace{path: path}
+		return nil
+	}
+}
+
+const (
+	traceStartEvt = iota
+	traceCreateScopeEvt
+	traceDestroyScopeEvt
+	traceReserveMemoryEvt
+	traceBlockReserveMemoryEvt
+	traceReleaseMemoryEvt
+	traceAddStreamEvt
+	traceBlockAddStreamEvt
+	traceRemoveStreamEvt
+	traceAddConnEvt
+	traceBlockAddConnEvt
+	traceRemoveConnEvt
+)
+
+type traceEvt struct {
+	Type int
+
+	Scope string `json:"omitempty"`
+
+	Limit interface{} `json:"omitempty"`
+
+	Priority uint8 `json:"omitempty"`
+
+	Delta    int64 `json:"omitempty"`
+	DeltaIn  int   `json:"omitempty"`
+	DeltaOut int   `json:"omitempty"`
+
+	Memory int64 `json:"omitempty"`
+
+	StreamsIn  int `json:"omitempty"`
+	StreamsOut int `json:"omitempty"`
+
+	ConnsIn  int `json:"omitempty"`
+	ConnsOut int `json:"omitempty"`
+
+	FD int `json:"omitempty"`
+}
+
+func (t *trace) push(evt interface{}) {
+	t.mx.Lock()
+	defer t.mx.Unlock()
+
+	if t.done {
+		return
+	}
+
+	t.pend = append(t.pend, evt)
+}
+
+func (t *trace) background(out io.WriteCloser) {
+	defer close(t.closed)
+	defer out.Close()
+
+	gzOut := gzip.NewWriter(out)
+	defer gzOut.Close()
+
+	jsonOut := json.NewEncoder(gzOut)
+
+	ticker := time.NewTicker(time.Second)
+	defer ticker.Stop()
+
+	var pend []interface{}
+
+	getEvents := func() {
+		t.mx.Lock()
+		tmp := t.pend
+		t.pend = pend[:0]
+		pend = tmp
+		t.mx.Unlock()
+	}
+
+	for {
+		select {
+		case <-ticker.C:
+			getEvents()
+
+			if err := t.writeEvents(pend, jsonOut); err != nil {
+				log.Warnf("error writing rcmgr trace: %s", err)
+				t.mx.Lock()
+				t.done = true
+				t.mx.Unlock()
+				return
+			}
+
+			if err := gzOut.Flush(); err != nil {
+				log.Warnf("error flushing rcmgr trace: %s", err)
+				t.mx.Lock()
+				t.done = true
+				t.mx.Unlock()
+				return
+			}
+
+		case <-t.ctx.Done():
+			getEvents()
+
+			if err := t.writeEvents(pend, jsonOut); err != nil {
+				log.Warnf("error writing rcmgr trace: %s", err)
+				return
+			}
+
+			if err := gzOut.Flush(); err != nil {
+				log.Warnf("error flushing rcmgr trace: %s", err)
+			}
+
+			return
+		}
+	}
+}
+
+func (t *trace) writeEvents(pend []interface{}, jout *json.Encoder) error {
+	for _, e := range pend {
+		if err := jout.Encode(e); err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
 
 func (t *trace) Start(limits Limiter) error {
 	if t == nil {
 		return nil
 	}
 
-	// TODO
+	t.ctx, t.cancel = context.WithCancel(context.Background())
+	t.closed = make(chan struct{})
+
+	out, err := os.OpenFile(t.path, os.O_CREATE|os.O_WRONLY|os.O_TRUNC, 0644)
+	if err != nil {
+		return nil
+	}
+
+	go t.background(out)
+
 	return nil
 }
 
@@ -20,24 +174,42 @@ func (t *trace) Close() error {
 		return nil
 	}
 
-	// TODO
+	t.mx.Lock()
+
+	if t.done {
+		t.mx.Unlock()
+		return nil
+	}
+
+	t.cancel()
+	t.done = true
+	t.mx.Unlock()
+
+	<-t.closed
 	return nil
 }
 
-func (t *trace) CreateScope(name string, limit Limit) {
+func (t *trace) CreateScope(scope string, limit Limit) {
 	if t == nil {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:  traceCreateScopeEvt,
+		Scope: scope,
+		Limit: limit,
+	})
 }
 
-func (t *trace) DestroyScope(name string) {
+func (t *trace) DestroyScope(scope string) {
 	if t == nil {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:  traceDestroyScopeEvt,
+		Scope: scope,
+	})
 }
 
 func (t *trace) ReserveMemory(scope string, prio uint8, size, mem int64) {
@@ -45,7 +217,13 @@ func (t *trace) ReserveMemory(scope string, prio uint8, size, mem int64) {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:     traceReserveMemoryEvt,
+		Scope:    scope,
+		Priority: prio,
+		Delta:    size,
+		Memory:   mem,
+	})
 }
 
 func (t *trace) BlockReserveMemory(scope string, prio uint8, size, mem int64) {
@@ -53,7 +231,13 @@ func (t *trace) BlockReserveMemory(scope string, prio uint8, size, mem int64) {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:     traceBlockReserveMemoryEvt,
+		Scope:    scope,
+		Priority: prio,
+		Delta:    size,
+		Memory:   mem,
+	})
 }
 
 func (t *trace) ReleaseMemory(scope string, size, mem int64) {
@@ -61,7 +245,12 @@ func (t *trace) ReleaseMemory(scope string, size, mem int64) {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:   traceReleaseMemoryEvt,
+		Scope:  scope,
+		Delta:  -size,
+		Memory: mem,
+	})
 }
 
 func (t *trace) AddStream(scope string, dir network.Direction, nstreamsIn, nstreamsOut int) {
@@ -69,7 +258,21 @@ func (t *trace) AddStream(scope string, dir network.Direction, nstreamsIn, nstre
 		return
 	}
 
-	// TODO
+	var deltaIn, deltaOut int
+	if dir == network.DirInbound {
+		deltaIn = 1
+	} else {
+		deltaOut = 1
+	}
+
+	t.push(traceEvt{
+		Type:       traceAddStreamEvt,
+		Scope:      scope,
+		DeltaIn:    deltaIn,
+		DeltaOut:   deltaOut,
+		StreamsIn:  nstreamsIn,
+		StreamsOut: nstreamsOut,
+	})
 }
 
 func (t *trace) BlockAddStream(scope string, dir network.Direction, nstreamsIn, nstreamsOut int) {
@@ -77,7 +280,21 @@ func (t *trace) BlockAddStream(scope string, dir network.Direction, nstreamsIn,
 		return
 	}
 
-	// TODO
+	var deltaIn, deltaOut int
+	if dir == network.DirInbound {
+		deltaIn = 1
+	} else {
+		deltaOut = 1
+	}
+
+	t.push(traceEvt{
+		Type:       traceBlockAddStreamEvt,
+		Scope:      scope,
+		DeltaIn:    deltaIn,
+		DeltaOut:   deltaOut,
+		StreamsIn:  nstreamsIn,
+		StreamsOut: nstreamsOut,
+	})
 }
 
 func (t *trace) RemoveStream(scope string, dir network.Direction, nstreamsIn, nstreamsOut int) {
@@ -85,31 +302,66 @@ func (t *trace) RemoveStream(scope string, dir network.Direction, nstreamsIn, ns
 		return
 	}
 
-	// TODO
+	var deltaIn, deltaOut int
+	if dir == network.DirInbound {
+		deltaIn = -1
+	} else {
+		deltaOut = -1
+	}
+
+	t.push(traceEvt{
+		Type:       traceRemoveStreamEvt,
+		Scope:      scope,
+		DeltaIn:    deltaIn,
+		DeltaOut:   deltaOut,
+		StreamsIn:  nstreamsIn,
+		StreamsOut: nstreamsOut,
+	})
 }
 
-func (t *trace) AddStreams(scope string, rsvpIn, rsvpOut, nstreamsIn, nstreamsOut int) {
+func (t *trace) AddStreams(scope string, deltaIn, deltaOut, nstreamsIn, nstreamsOut int) {
 	if t == nil {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:       traceAddStreamEvt,
+		Scope:      scope,
+		DeltaIn:    deltaIn,
+		DeltaOut:   deltaOut,
+		StreamsIn:  nstreamsIn,
+		StreamsOut: nstreamsOut,
+	})
 }
 
-func (t *trace) BlockAddStreams(scope string, rsvpIn, rsvpOut, nstreamsIn, nstreamsOut int) {
+func (t *trace) BlockAddStreams(scope string, deltaIn, deltaOut, nstreamsIn, nstreamsOut int) {
 	if t == nil {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:       traceBlockAddStreamEvt,
+		Scope:      scope,
+		DeltaIn:    deltaIn,
+		DeltaOut:   deltaOut,
+		StreamsIn:  nstreamsIn,
+		StreamsOut: nstreamsOut,
+	})
 }
 
-func (t *trace) RemoveStreams(scope string, rsvpIn, rsvpOut, nstreamsIn, nstreamsOut int) {
+func (t *trace) RemoveStreams(scope string, deltaIn, deltaOut, nstreamsIn, nstreamsOut int) {
 	if t == nil {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:       traceRemoveStreamEvt,
+		Scope:      scope,
+		DeltaIn:    -deltaIn,
+		DeltaOut:   -deltaOut,
+		StreamsIn:  nstreamsIn,
+		StreamsOut: nstreamsOut,
+	})
 }
 
 func (t *trace) AddConn(scope string, dir network.Direction, usefd bool, nconnsIn, nconnsOut, nfd int) {
@@ -117,7 +369,26 @@ func (t *trace) AddConn(scope string, dir network.Direction, usefd bool, nconnsI
 		return
 	}
 
-	// TODO
+	var deltaIn, deltaOut, deltafd int
+	if dir == network.DirInbound {
+		deltaIn = 1
+	} else {
+		deltaOut = 1
+	}
+	if usefd {
+		deltafd = 1
+	}
+
+	t.push(traceEvt{
+		Type:     traceAddConnEvt,
+		Scope:    scope,
+		DeltaIn:  deltaIn,
+		DeltaOut: deltaOut,
+		Delta:    int64(deltafd),
+		ConnsIn:  nconnsIn,
+		ConnsOut: nconnsOut,
+		FD:       nfd,
+	})
 }
 
 func (t *trace) BlockAddConn(scope string, dir network.Direction, usefd bool, nconnsIn, nconnsOut, nfd int) {
@@ -125,7 +396,26 @@ func (t *trace) BlockAddConn(scope string, dir network.Direction, usefd bool, nc
 		return
 	}
 
-	// TODO
+	var deltaIn, deltaOut, deltafd int
+	if dir == network.DirInbound {
+		deltaIn = 1
+	} else {
+		deltaOut = 1
+	}
+	if usefd {
+		deltafd = 1
+	}
+
+	t.push(traceEvt{
+		Type:     traceBlockAddConnEvt,
+		Scope:    scope,
+		DeltaIn:  deltaIn,
+		DeltaOut: deltaOut,
+		Delta:    int64(deltafd),
+		ConnsIn:  nconnsIn,
+		ConnsOut: nconnsOut,
+		FD:       nfd,
+	})
 }
 
 func (t *trace) RemoveConn(scope string, dir network.Direction, usefd bool, nconnsIn, nconnsOut, nfd int) {
@@ -133,29 +423,75 @@ func (t *trace) RemoveConn(scope string, dir network.Direction, usefd bool, ncon
 		return
 	}
 
-	// TODO
+	var deltaIn, deltaOut, deltafd int
+	if dir == network.DirInbound {
+		deltaIn = -1
+	} else {
+		deltaOut = -1
+	}
+	if usefd {
+		deltafd = -1
+	}
+
+	t.push(traceEvt{
+		Type:     traceRemoveConnEvt,
+		Scope:    scope,
+		DeltaIn:  deltaIn,
+		DeltaOut: deltaOut,
+		Delta:    int64(deltafd),
+		ConnsIn:  nconnsIn,
+		ConnsOut: nconnsOut,
+		FD:       nfd,
+	})
 }
 
-func (t *trace) AddConns(scope string, rsvpIn, rsvpOut, rsvpFD, nconnsIn, nconnsOut, nfd int) {
+func (t *trace) AddConns(scope string, deltaIn, deltaOut, deltafd, nconnsIn, nconnsOut, nfd int) {
 	if t == nil {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:     traceAddConnEvt,
+		Scope:    scope,
+		DeltaIn:  deltaIn,
+		DeltaOut: deltaOut,
+		Delta:    int64(deltafd),
+		ConnsIn:  nconnsIn,
+		ConnsOut: nconnsOut,
+		FD:       nfd,
+	})
 }
 
-func (t *trace) BlockAddConns(scope string, rsvpIn, rsvpOut, rsvpFD, nconnsIn, nconnsOut, nfd int) {
+func (t *trace) BlockAddConns(scope string, deltaIn, deltaOut, deltafd, nconnsIn, nconnsOut, nfd int) {
 	if t == nil {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:     traceBlockAddConnEvt,
+		Scope:    scope,
+		DeltaIn:  deltaIn,
+		DeltaOut: deltaOut,
+		Delta:    int64(deltafd),
+		ConnsIn:  nconnsIn,
+		ConnsOut: nconnsOut,
+		FD:       nfd,
+	})
 }
 
-func (t *trace) RemoveConns(scope string, rsvpIn, rsvpOut, rsvpFD, nconnsIn, nconnsOut, nfd int) {
+func (t *trace) RemoveConns(scope string, deltaIn, deltaOut, deltafd, nconnsIn, nconnsOut, nfd int) {
 	if t == nil {
 		return
 	}
 
-	// TODO
+	t.push(traceEvt{
+		Type:     traceRemoveConnEvt,
+		Scope:    scope,
+		DeltaIn:  -deltaIn,
+		DeltaOut: -deltaOut,
+		Delta:    -int64(deltafd),
+		ConnsIn:  nconnsIn,
+		ConnsOut: nconnsOut,
+		FD:       nfd,
+	})
 }