Add --ninja_weight_source option

It has 3 options for now.
* ninja_log: uses ninja log file for data source
* evenly_distributed: pass empty list for ninja to consider every work as the same
* not_used: do not use critical path logic in ninja

In addition, I added the option in the metrics to track

Bug: 271527305
Test: m --ninja_weight_source=ninja_log|empty|not_used
Change-Id: Ib4c812c20606a34b17d3f0edb71057b477c4f90e
diff --git a/ui/build/config.go b/ui/build/config.go
index d8a2788..8a77b08 100644
--- a/ui/build/config.go
+++ b/ui/build/config.go
@@ -118,8 +118,21 @@
 	bazelForceEnabledModules string
 
 	includeTags []string
+
+	// Data source to write ninja weight list
+	ninjaWeightListSource NinjaWeightListSource
 }
 
+type NinjaWeightListSource uint
+
+const (
+	// ninja doesn't use weight list.
+	NOT_USED NinjaWeightListSource = iota
+	// ninja uses weight list based on previous builds by ninja log
+	NINJA_LOG
+	// ninja thinks every task has the same weight.
+	EVENLY_DISTRIBUTED
+)
 const srcDirFileCheck = "build/soong/root.bp"
 
 var buildFiles = []string{"Android.mk", "Android.bp"}
@@ -528,6 +541,17 @@
 	ctx.Metrics.SystemResourceInfo(s)
 }
 
+func getNinjaWeightListSourceInMetric(s NinjaWeightListSource) *smpb.NinjaWeightListSource {
+	switch s {
+	case NINJA_LOG:
+		return smpb.NinjaWeightListSource_NINJA_LOG.Enum()
+	case EVENLY_DISTRIBUTED:
+		return smpb.NinjaWeightListSource_EVENLY_DISTRIBUTED.Enum()
+	default:
+		return smpb.NinjaWeightListSource_NOT_USED.Enum()
+	}
+}
+
 func buildConfig(config Config) *smpb.BuildConfig {
 	c := &smpb.BuildConfig{
 		ForceUseGoma:                proto.Bool(config.ForceUseGoma()),
@@ -535,6 +559,7 @@
 		UseRbe:                      proto.Bool(config.UseRBE()),
 		BazelMixedBuild:             proto.Bool(config.BazelBuildEnabled()),
 		ForceDisableBazelMixedBuild: proto.Bool(config.IsBazelMixedBuildForceDisabled()),
+		NinjaWeightListSource:       getNinjaWeightListSourceInMetric(config.NinjaWeightListSource()),
 	}
 	c.Targets = append(c.Targets, config.arguments...)
 
@@ -797,6 +822,17 @@
 			c.bazelStagingMode = true
 		} else if arg == "--search-api-dir" {
 			c.searchApiDir = true
+		} else if strings.HasPrefix(arg, "--ninja_weight_source=") {
+			source := strings.TrimPrefix(arg, "--ninja_weight_source=")
+			if source == "ninja_log" {
+				c.ninjaWeightListSource = NINJA_LOG
+			} else if source == "evenly_distributed" {
+				c.ninjaWeightListSource = EVENLY_DISTRIBUTED
+			} else if source == "not_used" {
+				c.ninjaWeightListSource = NOT_USED
+			} else {
+				ctx.Fatalf("unknown option for ninja_weight_source: %s", source)
+			}
 		} else if strings.HasPrefix(arg, "--build-command=") {
 			buildCmd := strings.TrimPrefix(arg, "--build-command=")
 			// remove quotations
@@ -1091,6 +1127,10 @@
 	return c.multitreeBuild
 }
 
+func (c *configImpl) NinjaWeightListSource() NinjaWeightListSource {
+	return c.ninjaWeightListSource
+}
+
 func (c *configImpl) SkipKati() bool {
 	return c.skipKati
 }
diff --git a/ui/build/config_test.go b/ui/build/config_test.go
index 1749cd4..bedb181 100644
--- a/ui/build/config_test.go
+++ b/ui/build/config_test.go
@@ -1032,6 +1032,7 @@
 				UseRbe:                      proto.Bool(false),
 				BazelMixedBuild:             proto.Bool(false),
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1043,6 +1044,7 @@
 				UseRbe:                      proto.Bool(false),
 				BazelMixedBuild:             proto.Bool(false),
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1054,6 +1056,7 @@
 				UseRbe:                      proto.Bool(false),
 				BazelMixedBuild:             proto.Bool(false),
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1065,6 +1068,7 @@
 				UseRbe:                      proto.Bool(true),
 				BazelMixedBuild:             proto.Bool(false),
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1076,6 +1080,7 @@
 				UseRbe:                      proto.Bool(false),
 				BazelMixedBuild:             proto.Bool(false),
 				ForceDisableBazelMixedBuild: proto.Bool(true),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1088,6 +1093,7 @@
 				UseRbe:                      proto.Bool(false),
 				BazelMixedBuild:             proto.Bool(false),
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1100,6 +1106,7 @@
 				UseRbe:                      proto.Bool(false),
 				BazelMixedBuild:             proto.Bool(true),
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1112,6 +1119,7 @@
 				UseRbe:                      proto.Bool(false),
 				BazelMixedBuild:             proto.Bool(true),
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1124,6 +1132,7 @@
 				UseRbe:                      proto.Bool(false),
 				BazelMixedBuild:             proto.Bool(true),
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1138,6 +1147,7 @@
 				BazelMixedBuild:             proto.Bool(false),
 				Targets:                     []string{"droid", "dist"},
 				ForceDisableBazelMixedBuild: proto.Bool(false),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 		{
@@ -1156,6 +1166,7 @@
 				UseRbe:                      proto.Bool(true),
 				BazelMixedBuild:             proto.Bool(true),
 				ForceDisableBazelMixedBuild: proto.Bool(true),
+				NinjaWeightListSource:       smpb.NinjaWeightListSource_NOT_USED.Enum(),
 			},
 		},
 	}
diff --git a/ui/build/ninja.go b/ui/build/ninja.go
index 28f3c38..a91cc3b 100644
--- a/ui/build/ninja.go
+++ b/ui/build/ninja.go
@@ -33,6 +33,46 @@
 	ninjaEnvFileName = "ninja.environment"
 )
 
+func useNinjaBuildLog(ctx Context, config Config, cmd *Cmd) {
+	ninjaLogFile := filepath.Join(config.OutDir(), ".ninja_log")
+	data, err := os.ReadFile(ninjaLogFile)
+	var outputBuilder strings.Builder
+	if err == nil {
+		lines := strings.Split(strings.TrimSpace(string(data)), "\n")
+		// ninja log: <start>	<end>	<restat>	<name>	<cmdhash>
+		// ninja weight list: <name>,<end-start+1>
+		for _, line := range lines {
+			if strings.HasPrefix(line, "#") {
+				continue
+			}
+			fields := strings.Split(line, "\t")
+			path := fields[3]
+			start, err := strconv.Atoi(fields[0])
+			if err != nil {
+				continue
+			}
+			end, err := strconv.Atoi(fields[1])
+			if err != nil {
+				continue
+			}
+			outputBuilder.WriteString(path)
+			outputBuilder.WriteString(",")
+			outputBuilder.WriteString(strconv.Itoa(end-start+1) + "\n")
+		}
+	}
+	// If there is no ninja log file, just pass empty ninja weight list.
+	// Because it is still efficient with critical path calculation logic even without weight.
+
+	weightListFile := filepath.Join(config.OutDir(), ".ninja_weight_list")
+
+	err = os.WriteFile(weightListFile, []byte(outputBuilder.String()), 0644)
+	if err == nil {
+		cmd.Args = append(cmd.Args, "-o", "usesweightlist="+weightListFile)
+	} else {
+		ctx.Panicf("Could not write ninja weight list file %s", err)
+	}
+}
+
 // Constructs and runs the Ninja command line with a restricted set of
 // environment variables. It's important to restrict the environment Ninja runs
 // for hermeticity reasons, and to avoid spurious rebuilds.
@@ -85,6 +125,14 @@
 		cmd.Environment.AppendFromKati(config.KatiEnvFile())
 	}
 
+	switch config.NinjaWeightListSource() {
+	case NINJA_LOG:
+		useNinjaBuildLog(ctx, config, cmd)
+	case EVENLY_DISTRIBUTED:
+		// pass empty weight list means ninja considers every tasks's weight as 1(default value).
+		cmd.Args = append(cmd.Args, "-o", "usesweightlist=/dev/null")
+	}
+
 	// Allow both NINJA_ARGS and NINJA_EXTRA_ARGS, since both have been
 	// used in the past to specify extra ninja arguments.
 	if extra, ok := cmd.Environment.Get("NINJA_ARGS"); ok {
diff --git a/ui/metrics/metrics_proto/metrics.pb.go b/ui/metrics/metrics_proto/metrics.pb.go
index fc2c970..6e465d5 100644
--- a/ui/metrics/metrics_proto/metrics.pb.go
+++ b/ui/metrics/metrics_proto/metrics.pb.go
@@ -34,6 +34,65 @@
 	_ = protoimpl.EnforceVersion(protoimpl.MaxVersion - 20)
 )
 
+type NinjaWeightListSource int32
+
+const (
+	NinjaWeightListSource_NOT_USED           NinjaWeightListSource = 0
+	NinjaWeightListSource_NINJA_LOG          NinjaWeightListSource = 1
+	NinjaWeightListSource_EVENLY_DISTRIBUTED NinjaWeightListSource = 2
+)
+
+// Enum value maps for NinjaWeightListSource.
+var (
+	NinjaWeightListSource_name = map[int32]string{
+		0: "NOT_USED",
+		1: "NINJA_LOG",
+		2: "EVENLY_DISTRIBUTED",
+	}
+	NinjaWeightListSource_value = map[string]int32{
+		"NOT_USED":           0,
+		"NINJA_LOG":          1,
+		"EVENLY_DISTRIBUTED": 2,
+	}
+)
+
+func (x NinjaWeightListSource) Enum() *NinjaWeightListSource {
+	p := new(NinjaWeightListSource)
+	*p = x
+	return p
+}
+
+func (x NinjaWeightListSource) String() string {
+	return protoimpl.X.EnumStringOf(x.Descriptor(), protoreflect.EnumNumber(x))
+}
+
+func (NinjaWeightListSource) Descriptor() protoreflect.EnumDescriptor {
+	return file_metrics_proto_enumTypes[0].Descriptor()
+}
+
+func (NinjaWeightListSource) Type() protoreflect.EnumType {
+	return &file_metrics_proto_enumTypes[0]
+}
+
+func (x NinjaWeightListSource) Number() protoreflect.EnumNumber {
+	return protoreflect.EnumNumber(x)
+}
+
+// Deprecated: Do not use.
+func (x *NinjaWeightListSource) UnmarshalJSON(b []byte) error {
+	num, err := protoimpl.X.UnmarshalJSONEnum(x.Descriptor(), b)
+	if err != nil {
+		return err
+	}
+	*x = NinjaWeightListSource(num)
+	return nil
+}
+
+// Deprecated: Use NinjaWeightListSource.Descriptor instead.
+func (NinjaWeightListSource) EnumDescriptor() ([]byte, []int) {
+	return file_metrics_proto_rawDescGZIP(), []int{0}
+}
+
 type MetricsBase_BuildVariant int32
 
 const (
@@ -67,11 +126,11 @@
 }
 
 func (MetricsBase_BuildVariant) Descriptor() protoreflect.EnumDescriptor {
-	return file_metrics_proto_enumTypes[0].Descriptor()
+	return file_metrics_proto_enumTypes[1].Descriptor()
 }
 
 func (MetricsBase_BuildVariant) Type() protoreflect.EnumType {
-	return &file_metrics_proto_enumTypes[0]
+	return &file_metrics_proto_enumTypes[1]
 }
 
 func (x MetricsBase_BuildVariant) Number() protoreflect.EnumNumber {
@@ -132,11 +191,11 @@
 }
 
 func (MetricsBase_Arch) Descriptor() protoreflect.EnumDescriptor {
-	return file_metrics_proto_enumTypes[1].Descriptor()
+	return file_metrics_proto_enumTypes[2].Descriptor()
 }
 
 func (MetricsBase_Arch) Type() protoreflect.EnumType {
-	return &file_metrics_proto_enumTypes[1]
+	return &file_metrics_proto_enumTypes[2]
 }
 
 func (x MetricsBase_Arch) Number() protoreflect.EnumNumber {
@@ -191,11 +250,11 @@
 }
 
 func (ModuleTypeInfo_BuildSystem) Descriptor() protoreflect.EnumDescriptor {
-	return file_metrics_proto_enumTypes[2].Descriptor()
+	return file_metrics_proto_enumTypes[3].Descriptor()
 }
 
 func (ModuleTypeInfo_BuildSystem) Type() protoreflect.EnumType {
-	return &file_metrics_proto_enumTypes[2]
+	return &file_metrics_proto_enumTypes[3]
 }
 
 func (x ModuleTypeInfo_BuildSystem) Number() protoreflect.EnumNumber {
@@ -253,11 +312,11 @@
 }
 
 func (ExpConfigFetcher_ConfigStatus) Descriptor() protoreflect.EnumDescriptor {
-	return file_metrics_proto_enumTypes[3].Descriptor()
+	return file_metrics_proto_enumTypes[4].Descriptor()
 }
 
 func (ExpConfigFetcher_ConfigStatus) Type() protoreflect.EnumType {
-	return &file_metrics_proto_enumTypes[3]
+	return &file_metrics_proto_enumTypes[4]
 }
 
 func (x ExpConfigFetcher_ConfigStatus) Number() protoreflect.EnumNumber {
@@ -647,8 +706,17 @@
 	Targets []string `protobuf:"bytes,6,rep,name=targets" json:"targets,omitempty"`
 	// Whether the user explicitly disabled bazel mixed builds for this build.
 	ForceDisableBazelMixedBuild *bool `protobuf:"varint,7,opt,name=force_disable_bazel_mixed_build,json=forceDisableBazelMixedBuild" json:"force_disable_bazel_mixed_build,omitempty"`
+	// NOT_USED - ninja doesn't use weight list.
+	// NINJA_LOG - ninja uses weight list based on previous builds by ninja log
+	// EVENLY_DISTRIBUTED - ninja thinks every task has the same weight.
+	NinjaWeightListSource *NinjaWeightListSource `protobuf:"varint,8,opt,name=ninja_weight_list_source,json=ninjaWeightListSource,enum=soong_build_metrics.NinjaWeightListSource,def=0" json:"ninja_weight_list_source,omitempty"`
 }
 
+// Default values for BuildConfig fields.
+const (
+	Default_BuildConfig_NinjaWeightListSource = NinjaWeightListSource_NOT_USED
+)
+
 func (x *BuildConfig) Reset() {
 	*x = BuildConfig{}
 	if protoimpl.UnsafeEnabled {
@@ -730,6 +798,13 @@
 	return false
 }
 
+func (x *BuildConfig) GetNinjaWeightListSource() NinjaWeightListSource {
+	if x != nil && x.NinjaWeightListSource != nil {
+		return *x.NinjaWeightListSource
+	}
+	return Default_BuildConfig_NinjaWeightListSource
+}
+
 type SystemResourceInfo struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -1697,7 +1772,7 @@
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 }
 
 var (
@@ -1882,57 +1969,59 @@
 	return file_metrics_proto_rawDescData
 }
 
-var file_metrics_proto_enumTypes = make([]protoimpl.EnumInfo, 4)
+var file_metrics_proto_enumTypes = make([]protoimpl.EnumInfo, 5)
 var file_metrics_proto_msgTypes = make([]protoimpl.MessageInfo, 13)
 var file_metrics_proto_goTypes = []interface{}{
-	(MetricsBase_BuildVariant)(0),       // 0: soong_build_metrics.MetricsBase.BuildVariant
-	(MetricsBase_Arch)(0),               // 1: soong_build_metrics.MetricsBase.Arch
-	(ModuleTypeInfo_BuildSystem)(0),     // 2: soong_build_metrics.ModuleTypeInfo.BuildSystem
-	(ExpConfigFetcher_ConfigStatus)(0),  // 3: soong_build_metrics.ExpConfigFetcher.ConfigStatus
-	(*MetricsBase)(nil),                 // 4: soong_build_metrics.MetricsBase
-	(*BuildConfig)(nil),                 // 5: soong_build_metrics.BuildConfig
-	(*SystemResourceInfo)(nil),          // 6: soong_build_metrics.SystemResourceInfo
-	(*PerfInfo)(nil),                    // 7: soong_build_metrics.PerfInfo
-	(*ProcessResourceInfo)(nil),         // 8: soong_build_metrics.ProcessResourceInfo
-	(*ModuleTypeInfo)(nil),              // 9: soong_build_metrics.ModuleTypeInfo
-	(*CriticalUserJourneyMetrics)(nil),  // 10: soong_build_metrics.CriticalUserJourneyMetrics
-	(*CriticalUserJourneysMetrics)(nil), // 11: soong_build_metrics.CriticalUserJourneysMetrics
-	(*SoongBuildMetrics)(nil),           // 12: soong_build_metrics.SoongBuildMetrics
-	(*ExpConfigFetcher)(nil),            // 13: soong_build_metrics.ExpConfigFetcher
-	(*MixedBuildsInfo)(nil),             // 14: soong_build_metrics.MixedBuildsInfo
-	(*CriticalPathInfo)(nil),            // 15: soong_build_metrics.CriticalPathInfo
-	(*JobInfo)(nil),                     // 16: soong_build_metrics.JobInfo
+	(NinjaWeightListSource)(0),          // 0: soong_build_metrics.NinjaWeightListSource
+	(MetricsBase_BuildVariant)(0),       // 1: soong_build_metrics.MetricsBase.BuildVariant
+	(MetricsBase_Arch)(0),               // 2: soong_build_metrics.MetricsBase.Arch
+	(ModuleTypeInfo_BuildSystem)(0),     // 3: soong_build_metrics.ModuleTypeInfo.BuildSystem
+	(ExpConfigFetcher_ConfigStatus)(0),  // 4: soong_build_metrics.ExpConfigFetcher.ConfigStatus
+	(*MetricsBase)(nil),                 // 5: soong_build_metrics.MetricsBase
+	(*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
 }
 var file_metrics_proto_depIdxs = []int32{
-	0,  // 0: soong_build_metrics.MetricsBase.target_build_variant:type_name -> soong_build_metrics.MetricsBase.BuildVariant
-	1,  // 1: soong_build_metrics.MetricsBase.target_arch:type_name -> soong_build_metrics.MetricsBase.Arch
-	1,  // 2: soong_build_metrics.MetricsBase.host_arch:type_name -> soong_build_metrics.MetricsBase.Arch
-	1,  // 3: soong_build_metrics.MetricsBase.host_2nd_arch:type_name -> soong_build_metrics.MetricsBase.Arch
-	7,  // 4: soong_build_metrics.MetricsBase.setup_tools:type_name -> soong_build_metrics.PerfInfo
-	7,  // 5: soong_build_metrics.MetricsBase.kati_runs:type_name -> soong_build_metrics.PerfInfo
-	7,  // 6: soong_build_metrics.MetricsBase.soong_runs:type_name -> soong_build_metrics.PerfInfo
-	7,  // 7: soong_build_metrics.MetricsBase.ninja_runs:type_name -> soong_build_metrics.PerfInfo
-	7,  // 8: soong_build_metrics.MetricsBase.total:type_name -> soong_build_metrics.PerfInfo
-	12, // 9: soong_build_metrics.MetricsBase.soong_build_metrics:type_name -> soong_build_metrics.SoongBuildMetrics
-	5,  // 10: soong_build_metrics.MetricsBase.build_config:type_name -> soong_build_metrics.BuildConfig
-	6,  // 11: soong_build_metrics.MetricsBase.system_resource_info:type_name -> soong_build_metrics.SystemResourceInfo
-	7,  // 12: soong_build_metrics.MetricsBase.bazel_runs:type_name -> soong_build_metrics.PerfInfo
-	13, // 13: soong_build_metrics.MetricsBase.exp_config_fetcher:type_name -> soong_build_metrics.ExpConfigFetcher
-	15, // 14: soong_build_metrics.MetricsBase.critical_path_info:type_name -> soong_build_metrics.CriticalPathInfo
-	8,  // 15: soong_build_metrics.PerfInfo.processes_resource_info:type_name -> soong_build_metrics.ProcessResourceInfo
-	2,  // 16: soong_build_metrics.ModuleTypeInfo.build_system:type_name -> soong_build_metrics.ModuleTypeInfo.BuildSystem
-	4,  // 17: soong_build_metrics.CriticalUserJourneyMetrics.metrics:type_name -> soong_build_metrics.MetricsBase
-	10, // 18: soong_build_metrics.CriticalUserJourneysMetrics.cujs:type_name -> soong_build_metrics.CriticalUserJourneyMetrics
-	7,  // 19: soong_build_metrics.SoongBuildMetrics.events:type_name -> soong_build_metrics.PerfInfo
-	14, // 20: soong_build_metrics.SoongBuildMetrics.mixed_builds_info:type_name -> soong_build_metrics.MixedBuildsInfo
-	3,  // 21: soong_build_metrics.ExpConfigFetcher.status:type_name -> soong_build_metrics.ExpConfigFetcher.ConfigStatus
-	16, // 22: soong_build_metrics.CriticalPathInfo.critical_path:type_name -> soong_build_metrics.JobInfo
-	16, // 23: soong_build_metrics.CriticalPathInfo.long_running_jobs:type_name -> soong_build_metrics.JobInfo
-	24, // [24:24] is the sub-list for method output_type
-	24, // [24:24] is the sub-list for method input_type
-	24, // [24:24] is the sub-list for extension type_name
-	24, // [24:24] is the sub-list for extension extendee
-	0,  // [0:24] is the sub-list for field type_name
+	1,  // 0: soong_build_metrics.MetricsBase.target_build_variant:type_name -> soong_build_metrics.MetricsBase.BuildVariant
+	2,  // 1: soong_build_metrics.MetricsBase.target_arch:type_name -> soong_build_metrics.MetricsBase.Arch
+	2,  // 2: soong_build_metrics.MetricsBase.host_arch:type_name -> soong_build_metrics.MetricsBase.Arch
+	2,  // 3: soong_build_metrics.MetricsBase.host_2nd_arch:type_name -> soong_build_metrics.MetricsBase.Arch
+	8,  // 4: soong_build_metrics.MetricsBase.setup_tools:type_name -> soong_build_metrics.PerfInfo
+	8,  // 5: soong_build_metrics.MetricsBase.kati_runs:type_name -> soong_build_metrics.PerfInfo
+	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
+	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
+	0,  // 15: soong_build_metrics.BuildConfig.ninja_weight_list_source:type_name -> soong_build_metrics.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
 }
 
 func init() { file_metrics_proto_init() }
@@ -2103,7 +2192,7 @@
 		File: protoimpl.DescBuilder{
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_metrics_proto_rawDesc,
-			NumEnums:      4,
+			NumEnums:      5,
 			NumMessages:   13,
 			NumExtensions: 0,
 			NumServices:   0,
diff --git a/ui/metrics/metrics_proto/metrics.proto b/ui/metrics/metrics_proto/metrics.proto
index 9f49dc7..5c95116 100644
--- a/ui/metrics/metrics_proto/metrics.proto
+++ b/ui/metrics/metrics_proto/metrics.proto
@@ -153,6 +153,11 @@
 
   // Whether the user explicitly disabled bazel mixed builds for this build.
   optional bool force_disable_bazel_mixed_build = 7;
+
+  // NOT_USED - ninja doesn't use weight list.
+  // NINJA_LOG - ninja uses weight list based on previous builds by ninja log
+  // EVENLY_DISTRIBUTED - ninja thinks every task has the same weight.
+  optional NinjaWeightListSource ninja_weight_list_source = 8 [default = NOT_USED];
 }
 
 message SystemResourceInfo {
@@ -337,3 +342,9 @@
   // Description of a job
   optional string job_description = 2;
 }
+
+enum NinjaWeightListSource {
+  NOT_USED = 0;
+  NINJA_LOG = 1;
+  EVENLY_DISTRIBUTED = 2;
+}
\ No newline at end of file