tools/syz-testbed: align table per particular rows

It turns out that we often want to see the data aligned on some specific
property - e.g. align all checkouts by "exec total" and see how other
parameters differ.

Add a preliminary support of such a feature. On a row title click, pick
the minimal value in the row and wind the history of each column back
until the target row value is closest to the minimal one.

2 files changed, 61 insertions, 9 deletions

diff --git a/tools/syz-testbed/html.go b/tools/syz-testbed/html.go
index 396265dc5..bae718fda 100644
--- a/tools/syz-testbed/html.go
+++ b/tools/syz-testbed/html.go
@@ -126,6 +126,7 @@ type uiTable struct {
 	ColumnURL func(string) string
 	RowURL    func(string) string
 	Extra     bool
+	AlignedBy string
 }
 
 type uiStatView struct {
@@ -153,7 +154,12 @@ func (ctx *TestbedContext) httpMain(w http.ResponseWriter, r *http.Request) {
 		return
 	}
 	uiView := uiStatView{Name: activeView.Name}
-	table, err := activeView.StatsTable()
+
+	alignBy := r.FormValue("align")
+	if alignBy == "" {
+		alignBy = "fuzzing"
+	}
+	table, err := activeView.AlignedStatsTable(alignBy)
 	if err != nil {
 		log.Printf("stat table generation failed: %s", err)
 	} else {
@@ -172,8 +178,23 @@ func (ctx *TestbedContext) httpMain(w http.ResponseWriter, r *http.Request) {
 				if column == baseColumn {
 					return ""
 				}
-				return "/?view=" + url.QueryEscape(activeView.Name) + "&base_column=" + url.QueryEscape(column)
+				v := url.Values{}
+				v.Set("view", activeView.Name)
+				v.Set("base_column", column)
+				v.Set("align", alignBy)
+				return "/?" + v.Encode()
+			},
+			RowURL: func(row string) string {
+				if row == alignBy {
+					return ""
+				}
+				v := url.Values{}
+				v.Set("view", activeView.Name)
+				v.Set("base_column", baseColumn)
+				v.Set("align", row)
+				return "/?" + v.Encode()
 			},
+			AlignedBy: alignBy,
 		}
 	}
 
@@ -270,6 +291,9 @@ href="?view={{$view.Name}}">█ {{$view.Name}}</a>
 {{define "PrintTable"}}
 {{$uiTable := .}}
 {{if .Table}}
+{{if $uiTable.AlignedBy}}
+	The data are aligned by {{$uiTable.AlignedBy}} <br />
+{{end}}
 <table class="list_table">
 	<tr>
 	<th>{{.Table.TopLeftHeader}}</th>
@@ -289,7 +313,14 @@ href="?view={{$view.Name}}">█ {{$view.Name}}</a>
 	</tr>
 	{{range $r := .Table.SortedRows}}
 	<tr>
-		<td>{{$r}}</td>
+		<td>
+		{{$url := ""}}
+                {{if $uiTable.RowURL}}{{$url = (call $uiTable.RowURL $r)}}{{end}}
+			{{if $url}}<a href="{{$url}}">{{$r}}</a>
+			{{else}}
+			{{$r}}
+			{{end}}
+		</td>
 		{{range $c := $uiTable.Table.ColumnHeaders}}
 			{{$cell := ($uiTable.Table.Get $r $c)}}
 			{{if and $cell $uiTable.Extra}}
diff --git a/tools/syz-testbed/stats.go b/tools/syz-testbed/stats.go
index 42ce9537b..20ad9bb30 100644
--- a/tools/syz-testbed/stats.go
+++ b/tools/syz-testbed/stats.go
@@ -182,26 +182,47 @@ func (group RunResultGroup) groupNthRecord(i int) map[string]*stats.Sample {
 }
 
 func (view StatView) StatsTable() (*Table, error) {
-	commonLen := 0
+	return view.AlignedStatsTable("uptime")
+}
+
+func (view StatView) AlignedStatsTable(field string) (*Table, error) {
+	// We assume that the stats values are nonnegative.
+	var commonValue float64
 	for _, group := range view.Groups {
 		minLen := group.minResultLength()
 		if minLen == 0 {
 			continue
 		}
-		if minLen < commonLen || commonLen == 0 {
-			commonLen = minLen
+		sampleGroup := group.groupNthRecord(minLen - 1)
+		sample, ok := sampleGroup[field]
+		if !ok {
+			return nil, fmt.Errorf("field %v is not found", field)
+		}
+		currValue := sample.Median()
+		if currValue < commonValue || commonValue == 0 {
+			commonValue = currValue
 		}
 	}
-	// Map: stats key x group name -> value.
 	table := NewTable("Property")
 	cells := make(map[string]map[string]string)
 	for _, group := range view.Groups {
 		table.AddColumn(group.Name)
-		if group.minResultLength() == 0 {
+		minLen := group.minResultLength()
+		if minLen == 0 {
 			// Skip empty groups.
 			continue
 		}
-		samples := group.groupNthRecord(commonLen - 1)
+		// Unwind the samples so that they are aligned on the field value.
+		var samples map[string]*stats.Sample
+		for i := minLen - 1; i >= 0; i-- {
+			candidate := group.groupNthRecord(i)
+			// TODO: consider data interpolation.
+			if candidate[field].Median() >= commonValue {
+				samples = candidate
+			} else {
+				break
+			}
+		}
 		for key, sample := range samples {
 			if _, ok := cells[key]; !ok {
 				cells[key] = make(map[string]string)