Add performance counter metrics to build.trace.gz

Start a background goroutine at the beginning of soong_build that
captures the CPU usage, heap size, and total system memory every
second.  Propagate the values through soong_build_metrics.pb back
to soong_ui, and then into build.trace.gz.

Test: m nothing, examine build.trace.gz
Change-Id: Iad99f8f1f088f4f7f7d5f76566a38c0c4f4d0daa
diff --git a/android/metrics.go b/android/metrics.go
index 63c72cd..3571272 100644
--- a/android/metrics.go
+++ b/android/metrics.go
@@ -15,9 +15,13 @@
 package android
 
 import (
+	"bytes"
 	"io/ioutil"
+	"os"
 	"runtime"
 	"sort"
+	"strconv"
+	"time"
 
 	"github.com/google/blueprint/metrics"
 	"google.golang.org/protobuf/proto"
@@ -27,18 +31,21 @@
 
 var soongMetricsOnceKey = NewOnceKey("soong metrics")
 
-type SoongMetrics struct {
-	Modules  int
-	Variants int
+type soongMetrics struct {
+	modules       int
+	variants      int
+	perfCollector perfCollector
 }
 
-func readSoongMetrics(config Config) (SoongMetrics, bool) {
-	soongMetrics, ok := config.Peek(soongMetricsOnceKey)
-	if ok {
-		return soongMetrics.(SoongMetrics), true
-	} else {
-		return SoongMetrics{}, false
-	}
+type perfCollector struct {
+	events []*soong_metrics_proto.PerfCounters
+	stop   chan<- bool
+}
+
+func getSoongMetrics(config Config) *soongMetrics {
+	return config.Once(soongMetricsOnceKey, func() interface{} {
+		return &soongMetrics{}
+	}).(*soongMetrics)
 }
 
 func init() {
@@ -50,27 +57,27 @@
 type soongMetricsSingleton struct{}
 
 func (soongMetricsSingleton) GenerateBuildActions(ctx SingletonContext) {
-	metrics := SoongMetrics{}
+	metrics := getSoongMetrics(ctx.Config())
 	ctx.VisitAllModules(func(m Module) {
 		if ctx.PrimaryModule(m) == m {
-			metrics.Modules++
+			metrics.modules++
 		}
-		metrics.Variants++
-	})
-	ctx.Config().Once(soongMetricsOnceKey, func() interface{} {
-		return metrics
+		metrics.variants++
 	})
 }
 
 func collectMetrics(config Config, eventHandler *metrics.EventHandler) *soong_metrics_proto.SoongBuildMetrics {
 	metrics := &soong_metrics_proto.SoongBuildMetrics{}
 
-	soongMetrics, ok := readSoongMetrics(config)
-	if ok {
-		metrics.Modules = proto.Uint32(uint32(soongMetrics.Modules))
-		metrics.Variants = proto.Uint32(uint32(soongMetrics.Variants))
+	soongMetrics := getSoongMetrics(config)
+	if soongMetrics.modules > 0 {
+		metrics.Modules = proto.Uint32(uint32(soongMetrics.modules))
+		metrics.Variants = proto.Uint32(uint32(soongMetrics.variants))
 	}
 
+	soongMetrics.perfCollector.stop <- true
+	metrics.PerfCounters = soongMetrics.perfCollector.events
+
 	memStats := runtime.MemStats{}
 	runtime.ReadMemStats(&memStats)
 	metrics.MaxHeapSize = proto.Uint64(memStats.HeapSys)
@@ -107,6 +114,113 @@
 	return metrics
 }
 
+func StartBackgroundMetrics(config Config) {
+	perfCollector := &getSoongMetrics(config).perfCollector
+	stop := make(chan bool)
+	perfCollector.stop = stop
+
+	previousTime := time.Now()
+	previousCpuTime := readCpuTime()
+
+	ticker := time.NewTicker(time.Second)
+
+	go func() {
+		for {
+			select {
+			case <-stop:
+				ticker.Stop()
+				return
+			case <-ticker.C:
+				// carry on
+			}
+
+			currentTime := time.Now()
+
+			var memStats runtime.MemStats
+			runtime.ReadMemStats(&memStats)
+
+			currentCpuTime := readCpuTime()
+
+			interval := currentTime.Sub(previousTime)
+			intervalCpuTime := currentCpuTime - previousCpuTime
+			intervalCpuPercent := intervalCpuTime * 100 / interval
+
+			// heapAlloc is the memory that has been allocated on the heap but not yet GC'd.  It may be referenced,
+			// or unrefenced but not yet GC'd.
+			heapAlloc := memStats.HeapAlloc
+			// heapUnused is the memory that was previously used by the heap, but is currently not used.  It does not
+			// count memory that was used and then returned to the OS.
+			heapUnused := memStats.HeapIdle - memStats.HeapReleased
+			// heapOverhead is the memory used by the allocator and GC
+			heapOverhead := memStats.MSpanSys + memStats.MCacheSys + memStats.GCSys
+			// otherMem is the memory used outside of the heap.
+			otherMem := memStats.Sys - memStats.HeapSys - heapOverhead
+
+			perfCollector.events = append(perfCollector.events, &soong_metrics_proto.PerfCounters{
+				Time: proto.Uint64(uint64(currentTime.UnixNano())),
+				Groups: []*soong_metrics_proto.PerfCounterGroup{
+					{
+						Name: proto.String("cpu"),
+						Counters: []*soong_metrics_proto.PerfCounter{
+							{Name: proto.String("cpu_percent"), Value: proto.Int64(int64(intervalCpuPercent))},
+						},
+					}, {
+						Name: proto.String("memory"),
+						Counters: []*soong_metrics_proto.PerfCounter{
+							{Name: proto.String("heap_alloc"), Value: proto.Int64(int64(heapAlloc))},
+							{Name: proto.String("heap_unused"), Value: proto.Int64(int64(heapUnused))},
+							{Name: proto.String("heap_overhead"), Value: proto.Int64(int64(heapOverhead))},
+							{Name: proto.String("other"), Value: proto.Int64(int64(otherMem))},
+						},
+					},
+				},
+			})
+
+			previousTime = currentTime
+			previousCpuTime = currentCpuTime
+		}
+	}()
+}
+
+func readCpuTime() time.Duration {
+	if runtime.GOOS != "linux" {
+		return 0
+	}
+
+	stat, err := os.ReadFile("/proc/self/stat")
+	if err != nil {
+		return 0
+	}
+
+	endOfComm := bytes.LastIndexByte(stat, ')')
+	if endOfComm < 0 || endOfComm > len(stat)-2 {
+		return 0
+	}
+
+	stat = stat[endOfComm+2:]
+
+	statFields := bytes.Split(stat, []byte{' '})
+	// This should come from sysconf(_SC_CLK_TCK), but there's no way to call that from Go.  Assume it's 100,
+	// which is the value for all platforms we support.
+	const HZ = 100
+	const MS_PER_HZ = 1e3 / HZ * time.Millisecond
+
+	const STAT_UTIME_FIELD = 14 - 2
+	const STAT_STIME_FIELD = 15 - 2
+	if len(statFields) < STAT_STIME_FIELD {
+		return 0
+	}
+	userCpuTicks, err := strconv.ParseUint(string(statFields[STAT_UTIME_FIELD]), 10, 64)
+	if err != nil {
+		return 0
+	}
+	kernelCpuTicks, _ := strconv.ParseUint(string(statFields[STAT_STIME_FIELD]), 10, 64)
+	if err != nil {
+		return 0
+	}
+	return time.Duration(userCpuTicks+kernelCpuTicks) * MS_PER_HZ
+}
+
 func WriteMetrics(config Config, eventHandler *metrics.EventHandler, metricsFile string) error {
 	metrics := collectMetrics(config, eventHandler)
 
diff --git a/cmd/soong_build/main.go b/cmd/soong_build/main.go
index d20847b..568a6f8 100644
--- a/cmd/soong_build/main.go
+++ b/cmd/soong_build/main.go
@@ -422,6 +422,7 @@
 	metricsDir := availableEnv["LOG_DIR"]
 
 	ctx := newContext(configuration)
+	android.StartBackgroundMetrics(configuration)
 
 	var finalOutputFile string
 
diff --git a/ui/build/soong.go b/ui/build/soong.go
index 782a1b3..5ae8430 100644
--- a/ui/build/soong.go
+++ b/ui/build/soong.go
@@ -15,6 +15,7 @@
 package build
 
 import (
+	"android/soong/ui/tracer"
 	"fmt"
 	"io/fs"
 	"os"
@@ -774,6 +775,19 @@
 		ctx.Tracer.Complete(desc, ctx.Thread,
 			event.GetStartTime(), event.GetStartTime()+event.GetRealTime())
 	}
+	for _, event := range soongBuildMetrics.PerfCounters {
+		timestamp := event.GetTime()
+		for _, group := range event.Groups {
+			counters := make([]tracer.Counter, 0, len(group.Counters))
+			for _, counter := range group.Counters {
+				counters = append(counters, tracer.Counter{
+					Name:  counter.GetName(),
+					Value: counter.GetValue(),
+				})
+			}
+			ctx.Tracer.CountersAtTime(group.GetName(), ctx.Thread, timestamp, counters)
+		}
+	}
 }
 
 func runMicrofactory(ctx Context, config Config, name string, pkg string, mapping map[string]string) {
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index f3e677a..b75f572 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -279,7 +279,7 @@
 
 // Deprecated: Use ModuleTypeInfo_BuildSystem.Descriptor instead.
 func (ModuleTypeInfo_BuildSystem) EnumDescriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{5, 0}
+	return file_metrics_proto_rawDescGZIP(), []int{8, 0}
 }
 
 type ExpConfigFetcher_ConfigStatus int32
@@ -341,7 +341,7 @@
 
 // Deprecated: Use ExpConfigFetcher_ConfigStatus.Descriptor instead.
 func (ExpConfigFetcher_ConfigStatus) EnumDescriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{9, 0}
+	return file_metrics_proto_rawDescGZIP(), []int{12, 0}
 }
 
 type MetricsBase struct {
@@ -999,6 +999,177 @@
 	return ""
 }
 
+type PerfCounters struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The timestamp of these counters in nanoseconds.
+	Time *uint64 `protobuf:"varint,1,opt,name=time" json:"time,omitempty"`
+	// A list of counter names and values.
+	Groups []*PerfCounterGroup `protobuf:"bytes,2,rep,name=groups" json:"groups,omitempty"`
+}
+
+func (x *PerfCounters) Reset() {
+	*x = PerfCounters{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_metrics_proto_msgTypes[4]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PerfCounters) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PerfCounters) ProtoMessage() {}
+
+func (x *PerfCounters) ProtoReflect() protoreflect.Message {
+	mi := &file_metrics_proto_msgTypes[4]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PerfCounters.ProtoReflect.Descriptor instead.
+func (*PerfCounters) Descriptor() ([]byte, []int) {
+	return file_metrics_proto_rawDescGZIP(), []int{4}
+}
+
+func (x *PerfCounters) GetTime() uint64 {
+	if x != nil && x.Time != nil {
+		return *x.Time
+	}
+	return 0
+}
+
+func (x *PerfCounters) GetGroups() []*PerfCounterGroup {
+	if x != nil {
+		return x.Groups
+	}
+	return nil
+}
+
+type PerfCounterGroup struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The name of this counter group (e.g. "cpu" or "memory")
+	Name *string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	// The counters in this group
+	Counters []*PerfCounter `protobuf:"bytes,2,rep,name=counters" json:"counters,omitempty"`
+}
+
+func (x *PerfCounterGroup) Reset() {
+	*x = PerfCounterGroup{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_metrics_proto_msgTypes[5]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PerfCounterGroup) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PerfCounterGroup) ProtoMessage() {}
+
+func (x *PerfCounterGroup) ProtoReflect() protoreflect.Message {
+	mi := &file_metrics_proto_msgTypes[5]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PerfCounterGroup.ProtoReflect.Descriptor instead.
+func (*PerfCounterGroup) Descriptor() ([]byte, []int) {
+	return file_metrics_proto_rawDescGZIP(), []int{5}
+}
+
+func (x *PerfCounterGroup) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *PerfCounterGroup) GetCounters() []*PerfCounter {
+	if x != nil {
+		return x.Counters
+	}
+	return nil
+}
+
+type PerfCounter struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	// The name of this counter.
+	Name *string `protobuf:"bytes,1,opt,name=name" json:"name,omitempty"`
+	// The value of this counter.
+	Value *int64 `protobuf:"varint,2,opt,name=value" json:"value,omitempty"`
+}
+
+func (x *PerfCounter) Reset() {
+	*x = PerfCounter{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_metrics_proto_msgTypes[6]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *PerfCounter) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*PerfCounter) ProtoMessage() {}
+
+func (x *PerfCounter) ProtoReflect() protoreflect.Message {
+	mi := &file_metrics_proto_msgTypes[6]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use PerfCounter.ProtoReflect.Descriptor instead.
+func (*PerfCounter) Descriptor() ([]byte, []int) {
+	return file_metrics_proto_rawDescGZIP(), []int{6}
+}
+
+func (x *PerfCounter) GetName() string {
+	if x != nil && x.Name != nil {
+		return *x.Name
+	}
+	return ""
+}
+
+func (x *PerfCounter) GetValue() int64 {
+	if x != nil && x.Value != nil {
+		return *x.Value
+	}
+	return 0
+}
+
 type ProcessResourceInfo struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1029,7 +1200,7 @@
 func (x *ProcessResourceInfo) Reset() {
 	*x = ProcessResourceInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[4]
+		mi := &file_metrics_proto_msgTypes[7]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1042,7 +1213,7 @@
 func (*ProcessResourceInfo) ProtoMessage() {}
 
 func (x *ProcessResourceInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[4]
+	mi := &file_metrics_proto_msgTypes[7]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1055,7 +1226,7 @@
 
 // Deprecated: Use ProcessResourceInfo.ProtoReflect.Descriptor instead.
 func (*ProcessResourceInfo) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{4}
+	return file_metrics_proto_rawDescGZIP(), []int{7}
 }
 
 func (x *ProcessResourceInfo) GetName() string {
@@ -1149,7 +1320,7 @@
 func (x *ModuleTypeInfo) Reset() {
 	*x = ModuleTypeInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[5]
+		mi := &file_metrics_proto_msgTypes[8]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1162,7 +1333,7 @@
 func (*ModuleTypeInfo) ProtoMessage() {}
 
 func (x *ModuleTypeInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[5]
+	mi := &file_metrics_proto_msgTypes[8]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1175,7 +1346,7 @@
 
 // Deprecated: Use ModuleTypeInfo.ProtoReflect.Descriptor instead.
 func (*ModuleTypeInfo) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{5}
+	return file_metrics_proto_rawDescGZIP(), []int{8}
 }
 
 func (x *ModuleTypeInfo) GetBuildSystem() ModuleTypeInfo_BuildSystem {
@@ -1213,7 +1384,7 @@
 func (x *CriticalUserJourneyMetrics) Reset() {
 	*x = CriticalUserJourneyMetrics{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[6]
+		mi := &file_metrics_proto_msgTypes[9]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1226,7 +1397,7 @@
 func (*CriticalUserJourneyMetrics) ProtoMessage() {}
 
 func (x *CriticalUserJourneyMetrics) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[6]
+	mi := &file_metrics_proto_msgTypes[9]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1239,7 +1410,7 @@
 
 // Deprecated: Use CriticalUserJourneyMetrics.ProtoReflect.Descriptor instead.
 func (*CriticalUserJourneyMetrics) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{6}
+	return file_metrics_proto_rawDescGZIP(), []int{9}
 }
 
 func (x *CriticalUserJourneyMetrics) GetName() string {
@@ -1268,7 +1439,7 @@
 func (x *CriticalUserJourneysMetrics) Reset() {
 	*x = CriticalUserJourneysMetrics{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[7]
+		mi := &file_metrics_proto_msgTypes[10]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1281,7 +1452,7 @@
 func (*CriticalUserJourneysMetrics) ProtoMessage() {}
 
 func (x *CriticalUserJourneysMetrics) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[7]
+	mi := &file_metrics_proto_msgTypes[10]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1294,7 +1465,7 @@
 
 // Deprecated: Use CriticalUserJourneysMetrics.ProtoReflect.Descriptor instead.
 func (*CriticalUserJourneysMetrics) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{7}
+	return file_metrics_proto_rawDescGZIP(), []int{10}
 }
 
 func (x *CriticalUserJourneysMetrics) GetCujs() []*CriticalUserJourneyMetrics {
@@ -1323,12 +1494,14 @@
 	Events []*PerfInfo `protobuf:"bytes,6,rep,name=events" json:"events,omitempty"`
 	// Mixed Builds information
 	MixedBuildsInfo *MixedBuildsInfo `protobuf:"bytes,7,opt,name=mixed_builds_info,json=mixedBuildsInfo" json:"mixed_builds_info,omitempty"`
+	// Performance during for soong_build execution.
+	PerfCounters []*PerfCounters `protobuf:"bytes,8,rep,name=perf_counters,json=perfCounters" json:"perf_counters,omitempty"`
 }
 
 func (x *SoongBuildMetrics) Reset() {
 	*x = SoongBuildMetrics{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[8]
+		mi := &file_metrics_proto_msgTypes[11]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1341,7 +1514,7 @@
 func (*SoongBuildMetrics) ProtoMessage() {}
 
 func (x *SoongBuildMetrics) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[8]
+	mi := &file_metrics_proto_msgTypes[11]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1354,7 +1527,7 @@
 
 // Deprecated: Use SoongBuildMetrics.ProtoReflect.Descriptor instead.
 func (*SoongBuildMetrics) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{8}
+	return file_metrics_proto_rawDescGZIP(), []int{11}
 }
 
 func (x *SoongBuildMetrics) GetModules() uint32 {
@@ -1406,6 +1579,13 @@
 	return nil
 }
 
+func (x *SoongBuildMetrics) GetPerfCounters() []*PerfCounters {
+	if x != nil {
+		return x.PerfCounters
+	}
+	return nil
+}
+
 type ExpConfigFetcher struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1425,7 +1605,7 @@
 func (x *ExpConfigFetcher) Reset() {
 	*x = ExpConfigFetcher{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[9]
+		mi := &file_metrics_proto_msgTypes[12]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1438,7 +1618,7 @@
 func (*ExpConfigFetcher) ProtoMessage() {}
 
 func (x *ExpConfigFetcher) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[9]
+	mi := &file_metrics_proto_msgTypes[12]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1451,7 +1631,7 @@
 
 // Deprecated: Use ExpConfigFetcher.ProtoReflect.Descriptor instead.
 func (*ExpConfigFetcher) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{9}
+	return file_metrics_proto_rawDescGZIP(), []int{12}
 }
 
 func (x *ExpConfigFetcher) GetStatus() ExpConfigFetcher_ConfigStatus {
@@ -1489,7 +1669,7 @@
 func (x *MixedBuildsInfo) Reset() {
 	*x = MixedBuildsInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[10]
+		mi := &file_metrics_proto_msgTypes[13]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1502,7 +1682,7 @@
 func (*MixedBuildsInfo) ProtoMessage() {}
 
 func (x *MixedBuildsInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[10]
+	mi := &file_metrics_proto_msgTypes[13]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1515,7 +1695,7 @@
 
 // Deprecated: Use MixedBuildsInfo.ProtoReflect.Descriptor instead.
 func (*MixedBuildsInfo) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{10}
+	return file_metrics_proto_rawDescGZIP(), []int{13}
 }
 
 func (x *MixedBuildsInfo) GetMixedBuildEnabledModules() []string {
@@ -1552,7 +1732,7 @@
 func (x *CriticalPathInfo) Reset() {
 	*x = CriticalPathInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[11]
+		mi := &file_metrics_proto_msgTypes[14]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1565,7 +1745,7 @@
 func (*CriticalPathInfo) ProtoMessage() {}
 
 func (x *CriticalPathInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[11]
+	mi := &file_metrics_proto_msgTypes[14]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1578,7 +1758,7 @@
 
 // Deprecated: Use CriticalPathInfo.ProtoReflect.Descriptor instead.
 func (*CriticalPathInfo) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{11}
+	return file_metrics_proto_rawDescGZIP(), []int{14}
 }
 
 func (x *CriticalPathInfo) GetElapsedTimeMicros() uint64 {
@@ -1623,7 +1803,7 @@
 func (x *JobInfo) Reset() {
 	*x = JobInfo{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_metrics_proto_msgTypes[12]
+		mi := &file_metrics_proto_msgTypes[15]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -1636,7 +1816,7 @@
 func (*JobInfo) ProtoMessage() {}
 
 func (x *JobInfo) ProtoReflect() protoreflect.Message {
-	mi := &file_metrics_proto_msgTypes[12]
+	mi := &file_metrics_proto_msgTypes[15]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1649,7 +1829,7 @@
 
 // Deprecated: Use JobInfo.ProtoReflect.Descriptor instead.
 func (*JobInfo) Descriptor() ([]byte, []int) {
-	return file_metrics_proto_rawDescGZIP(), []int{12}
+	return file_metrics_proto_rawDescGZIP(), []int{15}
 }
 
 func (x *JobInfo) GetElapsedTimeMicros() uint64 {
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 }
 
 var (
@@ -1997,7 +2198,7 @@
 }
 
 var file_metrics_proto_enumTypes = make([]protoimpl.EnumInfo, 5)
-var file_metrics_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
+var file_metrics_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
 var file_metrics_proto_goTypes = []interface{}{
 	(MetricsBase_BuildVariant)(0),          // 0: soong_build_metrics.MetricsBase.BuildVariant
 	(MetricsBase_Arch)(0),                  // 1: soong_build_metrics.MetricsBase.Arch
@@ -2008,15 +2209,18 @@
 	(*BuildConfig)(nil),                    // 6: soong_build_metrics.BuildConfig
 	(*SystemResourceInfo)(nil),             // 7: soong_build_metrics.SystemResourceInfo
 	(*PerfInfo)(nil),                       // 8: soong_build_metrics.PerfInfo
-	(*ProcessResourceInfo)(nil),            // 9: soong_build_metrics.ProcessResourceInfo
-	(*ModuleTypeInfo)(nil),                 // 10: soong_build_metrics.ModuleTypeInfo
-	(*CriticalUserJourneyMetrics)(nil),     // 11: soong_build_metrics.CriticalUserJourneyMetrics
-	(*CriticalUserJourneysMetrics)(nil),    // 12: soong_build_metrics.CriticalUserJourneysMetrics
-	(*SoongBuildMetrics)(nil),              // 13: soong_build_metrics.SoongBuildMetrics
-	(*ExpConfigFetcher)(nil),               // 14: soong_build_metrics.ExpConfigFetcher
-	(*MixedBuildsInfo)(nil),                // 15: soong_build_metrics.MixedBuildsInfo
-	(*CriticalPathInfo)(nil),               // 16: soong_build_metrics.CriticalPathInfo
-	(*JobInfo)(nil),                        // 17: soong_build_metrics.JobInfo
+	(*PerfCounters)(nil),                   // 9: soong_build_metrics.PerfCounters
+	(*PerfCounterGroup)(nil),               // 10: soong_build_metrics.PerfCounterGroup
+	(*PerfCounter)(nil),                    // 11: soong_build_metrics.PerfCounter
+	(*ProcessResourceInfo)(nil),            // 12: soong_build_metrics.ProcessResourceInfo
+	(*ModuleTypeInfo)(nil),                 // 13: soong_build_metrics.ModuleTypeInfo
+	(*CriticalUserJourneyMetrics)(nil),     // 14: soong_build_metrics.CriticalUserJourneyMetrics
+	(*CriticalUserJourneysMetrics)(nil),    // 15: soong_build_metrics.CriticalUserJourneysMetrics
+	(*SoongBuildMetrics)(nil),              // 16: soong_build_metrics.SoongBuildMetrics
+	(*ExpConfigFetcher)(nil),               // 17: soong_build_metrics.ExpConfigFetcher
+	(*MixedBuildsInfo)(nil),                // 18: soong_build_metrics.MixedBuildsInfo
+	(*CriticalPathInfo)(nil),               // 19: soong_build_metrics.CriticalPathInfo
+	(*JobInfo)(nil),                        // 20: soong_build_metrics.JobInfo
 }
 var file_metrics_proto_depIdxs = []int32{
 	0,  // 0: soong_build_metrics.MetricsBase.target_build_variant:type_name -> soong_build_metrics.MetricsBase.BuildVariant
@@ -2028,27 +2232,30 @@
 	8,  // 6: soong_build_metrics.MetricsBase.soong_runs:type_name -> soong_build_metrics.PerfInfo
 	8,  // 7: soong_build_metrics.MetricsBase.ninja_runs:type_name -> soong_build_metrics.PerfInfo
 	8,  // 8: soong_build_metrics.MetricsBase.total:type_name -> soong_build_metrics.PerfInfo
-	13, // 9: soong_build_metrics.MetricsBase.soong_build_metrics:type_name -> soong_build_metrics.SoongBuildMetrics
+	16, // 9: soong_build_metrics.MetricsBase.soong_build_metrics:type_name -> soong_build_metrics.SoongBuildMetrics
 	6,  // 10: soong_build_metrics.MetricsBase.build_config:type_name -> soong_build_metrics.BuildConfig
 	7,  // 11: soong_build_metrics.MetricsBase.system_resource_info:type_name -> soong_build_metrics.SystemResourceInfo
 	8,  // 12: soong_build_metrics.MetricsBase.bazel_runs:type_name -> soong_build_metrics.PerfInfo
-	14, // 13: soong_build_metrics.MetricsBase.exp_config_fetcher:type_name -> soong_build_metrics.ExpConfigFetcher
-	16, // 14: soong_build_metrics.MetricsBase.critical_path_info:type_name -> soong_build_metrics.CriticalPathInfo
+	17, // 13: soong_build_metrics.MetricsBase.exp_config_fetcher:type_name -> soong_build_metrics.ExpConfigFetcher
+	19, // 14: soong_build_metrics.MetricsBase.critical_path_info:type_name -> soong_build_metrics.CriticalPathInfo
 	2,  // 15: soong_build_metrics.BuildConfig.ninja_weight_list_source:type_name -> soong_build_metrics.BuildConfig.NinjaWeightListSource
-	9,  // 16: soong_build_metrics.PerfInfo.processes_resource_info:type_name -> soong_build_metrics.ProcessResourceInfo
-	3,  // 17: soong_build_metrics.ModuleTypeInfo.build_system:type_name -> soong_build_metrics.ModuleTypeInfo.BuildSystem
-	5,  // 18: soong_build_metrics.CriticalUserJourneyMetrics.metrics:type_name -> soong_build_metrics.MetricsBase
-	11, // 19: soong_build_metrics.CriticalUserJourneysMetrics.cujs:type_name -> soong_build_metrics.CriticalUserJourneyMetrics
-	8,  // 20: soong_build_metrics.SoongBuildMetrics.events:type_name -> soong_build_metrics.PerfInfo
-	15, // 21: soong_build_metrics.SoongBuildMetrics.mixed_builds_info:type_name -> soong_build_metrics.MixedBuildsInfo
-	4,  // 22: soong_build_metrics.ExpConfigFetcher.status:type_name -> soong_build_metrics.ExpConfigFetcher.ConfigStatus
-	17, // 23: soong_build_metrics.CriticalPathInfo.critical_path:type_name -> soong_build_metrics.JobInfo
-	17, // 24: soong_build_metrics.CriticalPathInfo.long_running_jobs:type_name -> soong_build_metrics.JobInfo
-	25, // [25:25] is the sub-list for method output_type
-	25, // [25:25] is the sub-list for method input_type
-	25, // [25:25] is the sub-list for extension type_name
-	25, // [25:25] is the sub-list for extension extendee
-	0,  // [0:25] is the sub-list for field type_name
+	12, // 16: soong_build_metrics.PerfInfo.processes_resource_info:type_name -> soong_build_metrics.ProcessResourceInfo
+	10, // 17: soong_build_metrics.PerfCounters.groups:type_name -> soong_build_metrics.PerfCounterGroup
+	11, // 18: soong_build_metrics.PerfCounterGroup.counters:type_name -> soong_build_metrics.PerfCounter
+	3,  // 19: soong_build_metrics.ModuleTypeInfo.build_system:type_name -> soong_build_metrics.ModuleTypeInfo.BuildSystem
+	5,  // 20: soong_build_metrics.CriticalUserJourneyMetrics.metrics:type_name -> soong_build_metrics.MetricsBase
+	14, // 21: soong_build_metrics.CriticalUserJourneysMetrics.cujs:type_name -> soong_build_metrics.CriticalUserJourneyMetrics
+	8,  // 22: soong_build_metrics.SoongBuildMetrics.events:type_name -> soong_build_metrics.PerfInfo
+	18, // 23: soong_build_metrics.SoongBuildMetrics.mixed_builds_info:type_name -> soong_build_metrics.MixedBuildsInfo
+	9,  // 24: soong_build_metrics.SoongBuildMetrics.perf_counters:type_name -> soong_build_metrics.PerfCounters
+	4,  // 25: soong_build_metrics.ExpConfigFetcher.status:type_name -> soong_build_metrics.ExpConfigFetcher.ConfigStatus
+	20, // 26: soong_build_metrics.CriticalPathInfo.critical_path:type_name -> soong_build_metrics.JobInfo
+	20, // 27: soong_build_metrics.CriticalPathInfo.long_running_jobs:type_name -> soong_build_metrics.JobInfo
+	28, // [28:28] is the sub-list for method output_type
+	28, // [28:28] is the sub-list for method input_type
+	28, // [28:28] is the sub-list for extension type_name
+	28, // [28:28] is the sub-list for extension extendee
+	0,  // [0:28] is the sub-list for field type_name
 }
 
 func init() { file_metrics_proto_init() }
@@ -2106,7 +2313,7 @@
 			}
 		}
 		file_metrics_proto_msgTypes[4].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ProcessResourceInfo); i {
+			switch v := v.(*PerfCounters); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2118,7 +2325,7 @@
 			}
 		}
 		file_metrics_proto_msgTypes[5].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ModuleTypeInfo); i {
+			switch v := v.(*PerfCounterGroup); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2130,7 +2337,7 @@
 			}
 		}
 		file_metrics_proto_msgTypes[6].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CriticalUserJourneyMetrics); i {
+			switch v := v.(*PerfCounter); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2142,7 +2349,7 @@
 			}
 		}
 		file_metrics_proto_msgTypes[7].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CriticalUserJourneysMetrics); i {
+			switch v := v.(*ProcessResourceInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2154,7 +2361,7 @@
 			}
 		}
 		file_metrics_proto_msgTypes[8].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*SoongBuildMetrics); i {
+			switch v := v.(*ModuleTypeInfo); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2166,7 +2373,7 @@
 			}
 		}
 		file_metrics_proto_msgTypes[9].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*ExpConfigFetcher); i {
+			switch v := v.(*CriticalUserJourneyMetrics); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2178,7 +2385,7 @@
 			}
 		}
 		file_metrics_proto_msgTypes[10].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*MixedBuildsInfo); i {
+			switch v := v.(*CriticalUserJourneysMetrics); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2190,7 +2397,7 @@
 			}
 		}
 		file_metrics_proto_msgTypes[11].Exporter = func(v interface{}, i int) interface{} {
-			switch v := v.(*CriticalPathInfo); i {
+			switch v := v.(*SoongBuildMetrics); i {
 			case 0:
 				return &v.state
 			case 1:
@@ -2202,6 +2409,42 @@
 			}
 		}
 		file_metrics_proto_msgTypes[12].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*ExpConfigFetcher); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_metrics_proto_msgTypes[13].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*MixedBuildsInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_metrics_proto_msgTypes[14].Exporter = func(v interface{}, i int) interface{} {
+			switch v := v.(*CriticalPathInfo); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_metrics_proto_msgTypes[15].Exporter = func(v interface{}, i int) interface{} {
 			switch v := v.(*JobInfo); i {
 			case 0:
 				return &v.state
@@ -2220,7 +2463,7 @@
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_metrics_proto_rawDesc,
 			NumEnums:      5,
-			NumMessages:   13,
+			NumMessages:   16,
 			NumExtensions: 0,
 			NumServices:   0,
 		},
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index b437da7..11fcba7 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -213,6 +213,30 @@
   optional string error_message = 8;
 }
 
+message PerfCounters {
+  // The timestamp of these counters in nanoseconds.
+  optional uint64 time = 1;
+
+  // A list of counter names and values.
+  repeated PerfCounterGroup groups = 2;
+}
+
+message PerfCounterGroup {
+  // The name of this counter group (e.g. "cpu" or "memory")
+  optional string name = 1;
+
+  // The counters in this group
+  repeated PerfCounter counters = 2;
+}
+
+message PerfCounter {
+  // The name of this counter.
+  optional string name = 1;
+
+  // The value of this counter.
+  optional int64 value = 2;
+}
+
 message ProcessResourceInfo {
   // The name of the process for identification.
   optional string name = 1;
@@ -295,6 +319,9 @@
 
   // Mixed Builds information
   optional MixedBuildsInfo mixed_builds_info = 7;
+
+  // Performance during for soong_build execution.
+  repeated PerfCounters perf_counters = 8;
 }
 
 message ExpConfigFetcher {
diff --git a/ui/tracer/tracer.go b/ui/tracer/tracer.go
index b8fc87b..33b3d89 100644
--- a/ui/tracer/tracer.go
+++ b/ui/tracer/tracer.go
@@ -46,6 +46,8 @@
 	End(thread Thread)
 	Complete(name string, thread Thread, begin, end uint64)
 
+	CountersAtTime(name string, thread Thread, time uint64, counters []Counter)
+
 	ImportMicrofactoryLog(filename string)
 
 	StatusTracer() status.StatusOutput
@@ -247,3 +249,48 @@
 		Tid:   uint64(thread),
 	})
 }
+
+type Counter struct {
+	Name  string
+	Value int64
+}
+
+type countersMarshaller []Counter
+
+var _ json.Marshaler = countersMarshaller(nil)
+
+func (counters countersMarshaller) MarshalJSON() ([]byte, error) {
+	// This produces similar output to a map[string]int64, but maintains the order of the slice.
+	buf := bytes.Buffer{}
+	buf.WriteRune('{')
+	for i, counter := range counters {
+		name, err := json.Marshal(counter.Name)
+		if err != nil {
+			return nil, err
+		}
+		buf.Write(name)
+		buf.WriteByte(':')
+		value, err := json.Marshal(counter.Value)
+		if err != nil {
+			return nil, err
+		}
+		buf.Write(value)
+		if i != len(counters)-1 {
+			buf.WriteRune(',')
+		}
+	}
+	buf.WriteRune('}')
+	return buf.Bytes(), nil
+}
+
+// CountersAtTime writes a Counter event at the given timestamp in nanoseconds.
+func (t *tracerImpl) CountersAtTime(name string, thread Thread, time uint64, counters []Counter) {
+	t.writeEvent(&viewerEvent{
+		Name:  name,
+		Phase: "C",
+		Time:  time / 1000,
+		Pid:   0,
+		Tid:   uint64(thread),
+		Arg:   countersMarshaller(counters),
+	})
+}