internal/trace: implement MutatorUtilizationV2

This change adds a new MutatorUtilization for traces for Go 1.22+.

To facilitate testing, it also generates a short trace with the
gc-stress.go test program (shortening its duration to 10ms) and adds it
to the tests for the internal/trace/v2 package. Notably, we make sure
this trace has a GCMarkAssistActive event to test that codepath.

For #63960.
For #60773.

Change-Id: I2e61f545988677be716818e2a08641c54c4c201f
Reviewed-on: https://go-review.googlesource.com/c/go/+/540256
LUCI-TryBot-Result: Go LUCI <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Reviewed-by: Michael Pratt <mpratt@google.com>

diff --git a/src/go/build/deps_test.go b/src/go/build/deps_test.go
index 9291c95ac17f71d5c46c196f68ea5b6c5bd62157..3d54fc7aac052ebd93e307fcf8286528863969b4 100644 (file)
--- a/src/go/build/deps_test.go
+++ b/src/go/build/deps_test.go
@@ -608,9 +608,6 @@ var depsRules = `
        FMT
        < internal/diff, internal/txtar;
 
-       FMT, container/heap, math/rand
-       < internal/trace;
-
        # v2 execution trace parser.
        FMT
        < internal/trace/v2/event;
@@ -633,6 +630,9 @@ var depsRules = `
        regexp, internal/txtar, internal/trace/v2, internal/trace/v2/raw
        < internal/trace/v2/internal/testgen/go122;
 
+       FMT, container/heap, math/rand, internal/trace/v2
+       < internal/trace;
+
        # Coverage.
        FMT, crypto/md5, encoding/binary, regexp, sort, text/tabwriter, unsafe,
        internal/coverage, internal/coverage/uleb128

diff --git a/src/internal/trace/gc.go b/src/internal/trace/gc.go
index 3bd284e200fa2b0290ad854c9684667c8c554039..e6a23835d6a6cc97018826b56ef37577ac44821b 100644 (file)
--- a/src/internal/trace/gc.go
+++ b/src/internal/trace/gc.go
@@ -6,6 +6,8 @@ package trace
 
 import (
        "container/heap"
+       tracev2 "internal/trace/v2"
+       "io"
        "math"
        "sort"
        "strings"
@@ -202,6 +204,268 @@ func MutatorUtilization(events []*Event, flags UtilFlags) [][]MutatorUtil {
        return out
 }
 
+// MutatorUtilizationV2 returns a set of mutator utilization functions
+// for the given v2 trace, passed as an io.Reader. Each function will
+// always end with 0 utilization. The bounds of each function are implicit
+// in the first and last event; outside of these bounds each function is
+// undefined.
+//
+// If the UtilPerProc flag is not given, this always returns a single
+// utilization function. Otherwise, it returns one function per P.
+func MutatorUtilizationV2(trace io.Reader, flags UtilFlags) ([][]MutatorUtil, error) {
+       // Create a reader.
+       r, err := tracev2.NewReader(trace)
+       if err != nil {
+               return nil, err
+       }
+
+       // Set up a bunch of analysis state.
+       type perP struct {
+               // gc > 0 indicates that GC is active on this P.
+               gc int
+               // series the logical series number for this P. This
+               // is necessary because Ps may be removed and then
+               // re-added, and then the new P needs a new series.
+               series int
+       }
+       type procsCount struct {
+               // time at which procs changed.
+               time int64
+               // n is the number of procs at that point.
+               n int
+       }
+       out := [][]MutatorUtil{}
+       stw := 0
+       ps := []perP{}
+       inGC := make(map[tracev2.GoID]bool)
+       states := make(map[tracev2.GoID]tracev2.GoState)
+       bgMark := make(map[tracev2.GoID]bool)
+       procs := []procsCount{}
+       seenSync := false
+
+       // Helpers.
+       handleSTW := func(r tracev2.Range) bool {
+               return flags&UtilSTW != 0 && isGCSTW(r)
+       }
+       handleMarkAssist := func(r tracev2.Range) bool {
+               return flags&UtilAssist != 0 && isGCMarkAssist(r)
+       }
+       handleSweep := func(r tracev2.Range) bool {
+               return flags&UtilSweep != 0 && isGCSweep(r)
+       }
+
+       // Iterate through the trace, tracking mutator utilization.
+       var lastEv tracev2.Event
+       for {
+               // Read a single event.
+               ev, err := r.ReadEvent()
+               if err == io.EOF {
+                       break
+               }
+               if err != nil {
+                       return nil, err
+               }
+               lastEv = ev
+
+               // Process the event.
+               switch ev.Kind() {
+               case tracev2.EventSync:
+                       seenSync = true
+               case tracev2.EventMetric:
+                       m := ev.Metric()
+                       if m.Name != "/sched/gomaxprocs:threads" {
+                               break
+                       }
+                       gomaxprocs := int(m.Value.Uint64())
+                       if len(ps) > gomaxprocs {
+                               if flags&UtilPerProc != 0 {
+                                       // End each P's series.
+                                       for _, p := range ps[gomaxprocs:] {
+                                               out[p.series] = addUtil(out[p.series], MutatorUtil{int64(ev.Time()), 0})
+                                       }
+                               }
+                               ps = ps[:gomaxprocs]
+                       }
+                       for len(ps) < gomaxprocs {
+                               // Start new P's series.
+                               series := 0
+                               if flags&UtilPerProc != 0 || len(out) == 0 {
+                                       series = len(out)
+                                       out = append(out, []MutatorUtil{{int64(ev.Time()), 1}})
+                               }
+                               ps = append(ps, perP{series: series})
+                       }
+                       if len(procs) == 0 || gomaxprocs != procs[len(procs)-1].n {
+                               procs = append(procs, procsCount{time: int64(ev.Time()), n: gomaxprocs})
+                       }
+               }
+               if len(ps) == 0 {
+                       // We can't start doing any analysis until we see what GOMAXPROCS is.
+                       // It will show up very early in the trace, but we need to be robust to
+                       // something else being emitted beforehand.
+                       continue
+               }
+
+               switch ev.Kind() {
+               case tracev2.EventRangeActive:
+                       if seenSync {
+                               // If we've seen a sync, then we can be sure we're not finding out about
+                               // something late; we have complete information after that point, and these
+                               // active events will just be redundant.
+                               break
+                       }
+                       // This range is active back to the start of the trace. We're failing to account
+                       // for this since we just found out about it now. Fix up the mutator utilization.
+                       //
+                       // N.B. A trace can't start during a STW, so we don't handle it here.
+                       r := ev.Range()
+                       switch {
+                       case handleMarkAssist(r):
+                               if !states[ev.Goroutine()].Executing() {
+                                       // If the goroutine isn't executing, then the fact that it was in mark
+                                       // assist doesn't actually count.
+                                       break
+                               }
+                               // This G has been in a mark assist *and running on its P* since the start
+                               // of the trace.
+                               fallthrough
+                       case handleSweep(r):
+                               // This P has been in sweep (or mark assist, from above) in the start of the trace.
+                               //
+                               // We don't need to do anything if UtilPerProc is set. If we get an event like
+                               // this for a running P, it must show up the first time a P is mentioned. Therefore,
+                               // this P won't actually have any MutatorUtils on its list yet.
+                               //
+                               // However, if UtilPerProc isn't set, then we probably have data from other procs
+                               // and from previous events. We need to fix that up.
+                               if flags&UtilPerProc != 0 {
+                                       break
+                               }
+                               // Subtract out 1/gomaxprocs mutator utilization for all time periods
+                               // from the beginning of the trace until now.
+                               mi, pi := 0, 0
+                               for mi < len(out[0]) {
+                                       if pi < len(procs)-1 && procs[pi+1].time < out[0][mi].Time {
+                                               pi++
+                                               continue
+                                       }
+                                       out[0][mi].Util -= float64(1) / float64(procs[pi].n)
+                                       if out[0][mi].Util < 0 {
+                                               out[0][mi].Util = 0
+                                       }
+                                       mi++
+                               }
+                       }
+                       // After accounting for the portion we missed, this just acts like the
+                       // beginning of a new range.
+                       fallthrough
+               case tracev2.EventRangeBegin:
+                       r := ev.Range()
+                       if handleSTW(r) {
+                               stw++
+                       } else if handleSweep(r) {
+                               ps[ev.Proc()].gc++
+                       } else if handleMarkAssist(r) {
+                               ps[ev.Proc()].gc++
+                               if g := r.Scope.Goroutine(); g != tracev2.NoGoroutine {
+                                       inGC[g] = true
+                               }
+                       }
+               case tracev2.EventRangeEnd:
+                       r := ev.Range()
+                       if handleSTW(r) {
+                               stw--
+                       } else if handleSweep(r) {
+                               ps[ev.Proc()].gc--
+                       } else if handleMarkAssist(r) {
+                               ps[ev.Proc()].gc--
+                               if g := r.Scope.Goroutine(); g != tracev2.NoGoroutine {
+                                       delete(inGC, g)
+                               }
+                       }
+               case tracev2.EventStateTransition:
+                       st := ev.StateTransition()
+                       if st.Resource.Kind != tracev2.ResourceGoroutine {
+                               break
+                       }
+                       old, new := st.Goroutine()
+                       g := st.Resource.Goroutine()
+                       if inGC[g] || bgMark[g] {
+                               if !old.Executing() && new.Executing() {
+                                       // Started running while doing GC things.
+                                       ps[ev.Proc()].gc++
+                               } else if old.Executing() && !new.Executing() {
+                                       // Stopped running while doing GC things.
+                                       ps[ev.Proc()].gc--
+                               }
+                       }
+                       states[g] = new
+               case tracev2.EventLabel:
+                       l := ev.Label()
+                       if flags&UtilBackground != 0 && strings.HasPrefix(l.Label, "GC ") && l.Label != "GC (idle)" {
+                               // Background mark worker.
+                               //
+                               // If we're in per-proc mode, we don't
+                               // count dedicated workers because
+                               // they kick all of the goroutines off
+                               // that P, so don't directly
+                               // contribute to goroutine latency.
+                               if !(flags&UtilPerProc != 0 && l.Label == "GC (dedicated)") {
+                                       bgMark[ev.Goroutine()] = true
+                                       ps[ev.Proc()].gc++
+                               }
+                       }
+               }
+
+               if flags&UtilPerProc == 0 {
+                       // Compute the current average utilization.
+                       if len(ps) == 0 {
+                               continue
+                       }
+                       gcPs := 0
+                       if stw > 0 {
+                               gcPs = len(ps)
+                       } else {
+                               for i := range ps {
+                                       if ps[i].gc > 0 {
+                                               gcPs++
+                                       }
+                               }
+                       }
+                       mu := MutatorUtil{int64(ev.Time()), 1 - float64(gcPs)/float64(len(ps))}
+
+                       // Record the utilization change. (Since
+                       // len(ps) == len(out), we know len(out) > 0.)
+                       out[0] = addUtil(out[0], mu)
+               } else {
+                       // Check for per-P utilization changes.
+                       for i := range ps {
+                               p := &ps[i]
+                               util := 1.0
+                               if stw > 0 || p.gc > 0 {
+                                       util = 0.0
+                               }
+                               out[p.series] = addUtil(out[p.series], MutatorUtil{int64(ev.Time()), util})
+                       }
+               }
+       }
+
+       // No events in the stream.
+       if lastEv.Kind() == tracev2.EventBad {
+               return nil, nil
+       }
+
+       // Add final 0 utilization event to any remaining series. This
+       // is important to mark the end of the trace. The exact value
+       // shouldn't matter since no window should extend beyond this,
+       // but using 0 is symmetric with the start of the trace.
+       mu := MutatorUtil{int64(lastEv.Time()), 0}
+       for i := range ps {
+               out[ps[i].series] = addUtil(out[ps[i].series], mu)
+       }
+       return out, nil
+}
+
 func addUtil(util []MutatorUtil, mu MutatorUtil) []MutatorUtil {
        if len(util) > 0 {
                if mu.Util == util[len(util)-1].Util {
@@ -824,3 +1088,15 @@ func (in *integrator) next(time int64) int64 {
        }
        return 1<<63 - 1
 }
+
+func isGCSTW(r tracev2.Range) bool {
+       return strings.HasPrefix(r.Name, "stop-the-world") && strings.Contains(r.Name, "GC")
+}
+
+func isGCMarkAssist(r tracev2.Range) bool {
+       return r.Name == "GC mark assist"
+}
+
+func isGCSweep(r tracev2.Range) bool {
+       return r.Name == "GC incremental sweep"
+}

diff --git a/src/internal/trace/gc_test.go b/src/internal/trace/gc_test.go
index 9b9771e7b0cea632ff0eea960e3d02fb8ff8ceaa..2bdcfef006f29d7f221c97516f53248366a480aa 100644 (file)
--- a/src/internal/trace/gc_test.go
+++ b/src/internal/trace/gc_test.go
@@ -6,6 +6,7 @@ package trace
 
 import (
        "bytes"
+       "internal/trace/v2/testtrace"
        "math"
        "os"
        "testing"
@@ -83,46 +84,62 @@ func TestMMUTrace(t *testing.T) {
                // test input too big for all.bash
                t.Skip("skipping in -short mode")
        }
+       check := func(t *testing.T, mu [][]MutatorUtil) {
+               mmuCurve := NewMMUCurve(mu)
 
-       data, err := os.ReadFile("testdata/stress_1_10_good")
-       if err != nil {
-               t.Fatalf("failed to read input file: %v", err)
-       }
-       _, events, err := parse(bytes.NewReader(data), "")
-       if err != nil {
-               t.Fatalf("failed to parse trace: %s", err)
-       }
-       mu := MutatorUtilization(events.Events, UtilSTW|UtilBackground|UtilAssist)
-       mmuCurve := NewMMUCurve(mu)
-
-       // Test the optimized implementation against the "obviously
-       // correct" implementation.
-       for window := time.Nanosecond; window < 10*time.Second; window *= 10 {
-               want := mmuSlow(mu[0], window)
-               got := mmuCurve.MMU(window)
-               if !aeq(want, got) {
-                       t.Errorf("want %f, got %f mutator utilization in window %s", want, got, window)
+               // Test the optimized implementation against the "obviously
+               // correct" implementation.
+               for window := time.Nanosecond; window < 10*time.Second; window *= 10 {
+                       want := mmuSlow(mu[0], window)
+                       got := mmuCurve.MMU(window)
+                       if !aeq(want, got) {
+                               t.Errorf("want %f, got %f mutator utilization in window %s", want, got, window)
+                       }
                }
-       }
 
-       // Test MUD with band optimization against MUD without band
-       // optimization. We don't have a simple testing implementation
-       // of MUDs (the simplest implementation is still quite
-       // complex), but this is still a pretty good test.
-       defer func(old int) { bandsPerSeries = old }(bandsPerSeries)
-       bandsPerSeries = 1
-       mmuCurve2 := NewMMUCurve(mu)
-       quantiles := []float64{0, 1 - .999, 1 - .99}
-       for window := time.Microsecond; window < time.Second; window *= 10 {
-               mud1 := mmuCurve.MUD(window, quantiles)
-               mud2 := mmuCurve2.MUD(window, quantiles)
-               for i := range mud1 {
-                       if !aeq(mud1[i], mud2[i]) {
-                               t.Errorf("for quantiles %v at window %v, want %v, got %v", quantiles, window, mud2, mud1)
-                               break
+               // Test MUD with band optimization against MUD without band
+               // optimization. We don't have a simple testing implementation
+               // of MUDs (the simplest implementation is still quite
+               // complex), but this is still a pretty good test.
+               defer func(old int) { bandsPerSeries = old }(bandsPerSeries)
+               bandsPerSeries = 1
+               mmuCurve2 := NewMMUCurve(mu)
+               quantiles := []float64{0, 1 - .999, 1 - .99}
+               for window := time.Microsecond; window < time.Second; window *= 10 {
+                       mud1 := mmuCurve.MUD(window, quantiles)
+                       mud2 := mmuCurve2.MUD(window, quantiles)
+                       for i := range mud1 {
+                               if !aeq(mud1[i], mud2[i]) {
+                                       t.Errorf("for quantiles %v at window %v, want %v, got %v", quantiles, window, mud2, mud1)
+                                       break
+                               }
                        }
                }
        }
+       t.Run("V1", func(t *testing.T) {
+               data, err := os.ReadFile("testdata/stress_1_10_good")
+               if err != nil {
+                       t.Fatalf("failed to read input file: %v", err)
+               }
+               events, err := Parse(bytes.NewReader(data), "")
+               if err != nil {
+                       t.Fatalf("failed to parse trace: %s", err)
+               }
+               check(t, MutatorUtilization(events.Events, UtilSTW|UtilBackground|UtilAssist))
+       })
+       t.Run("V2", func(t *testing.T) {
+               testPath := "v2/testdata/tests/go122-gc-stress.test"
+               r, _, err := testtrace.ParseFile(testPath)
+               if err != nil {
+                       t.Fatalf("malformed test %s: bad trace file: %v", testPath, err)
+               }
+               // Pass the trace through MutatorUtilizationV2.
+               mu, err := MutatorUtilizationV2(r, UtilSTW|UtilBackground|UtilAssist)
+               if err != nil {
+                       t.Fatalf("failed to compute mutator utilization or parse trace: %v", err)
+               }
+               check(t, mu)
+       })
 }
 
 func BenchmarkMMU(b *testing.B) {
@@ -130,7 +147,7 @@ func BenchmarkMMU(b *testing.B) {
        if err != nil {
                b.Fatalf("failed to read input file: %v", err)
        }
-       _, events, err := parse(bytes.NewReader(data), "")
+       events, err := Parse(bytes.NewReader(data), "")
        if err != nil {
                b.Fatalf("failed to parse trace: %s", err)
        }

diff --git a/src/internal/trace/v2/testdata/tests/go122-gc-stress.test b/src/internal/trace/v2/testdata/tests/go122-gc-stress.test
new file mode 100644 (file)
index 0000000..7192e83
--- /dev/null
+++ b/src/internal/trace/v2/testdata/tests/go122-gc-stress.test
@@ -0,0 +1,2444 @@
+-- expect --
+SUCCESS
+-- trace --
+Trace Go1.22
+EventBatch gen=6 m=18446744073709551615 time=22352100137206 size=5
+Frequency freq=15625000
+EventBatch gen=6 m=298977 time=22352100074002 size=210
+ProcStatus dt=1 p=18 pstatus=1
+GoStatus dt=2 g=46 m=298977 gstatus=2
+GoBlock dt=11 reason_string=15 stack=7
+GoStart dt=20 g=113 g_seq=1
+HeapAlloc dt=296 heapalloc_value=199905624
+GoStop dt=6015 reason_string=16 stack=3
+GoStart dt=10924 g=107 g_seq=1
+HeapAlloc dt=62 heapalloc_value=202878552
+GoStop dt=15189 reason_string=16 stack=3
+GoUnblock dt=15 g=46 g_seq=13 stack=0
+GoStart dt=6 g=46 g_seq=14
+GoLabel dt=1 label_string=2
+GoBlock dt=427 reason_string=15 stack=7
+GoStart dt=15 g=92 g_seq=4
+HeapAlloc dt=1205 heapalloc_value=203730520
+GoStop dt=13 reason_string=16 stack=3
+GoStart dt=11 g=103 g_seq=1
+HeapAlloc dt=53241 heapalloc_value=205831256
+GoStop dt=9 reason_string=16 stack=3
+GoStart dt=29 g=98 g_seq=3
+HeapAlloc dt=22 heapalloc_value=205921368
+HeapAlloc dt=45 heapalloc_value=206027864
+GoStop dt=58721 reason_string=16 stack=3
+GoStart dt=9 g=98 g_seq=4
+HeapAlloc dt=98 heapalloc_value=210099288
+HeapAlloc dt=29 heapalloc_value=210238552
+GoStop dt=5122 reason_string=16 stack=3
+GoStart dt=169 g=97 g_seq=5
+HeapAlloc dt=96 heapalloc_value=210459544
+HeapAlloc dt=95 heapalloc_value=210516888
+HeapAlloc dt=16 heapalloc_value=210582424
+HeapAlloc dt=36 heapalloc_value=210639768
+GCMarkAssistBegin dt=15 stack=2
+GoBlock dt=54 reason_string=10 stack=19
+ProcStop dt=59
+ProcStart dt=654 p=18 p_seq=1
+GoStart dt=16 g=85 g_seq=5
+HeapAlloc dt=4270 heapalloc_value=211139480
+GoStop dt=11 reason_string=16 stack=3
+GoStart dt=37 g=85 g_seq=6
+GCMarkAssistBegin dt=9 stack=2
+GoBlock dt=23 reason_string=10 stack=19
+ProcStop dt=1324
+EventBatch gen=6 m=298976 time=22352100053556 size=187
+ProcStatus dt=2 p=2 pstatus=1
+GoStatus dt=2 g=39 m=298976 gstatus=2
+GoBlock dt=12 reason_string=15 stack=7
+GoUnblock dt=18 g=39 g_seq=1 stack=0
+GoStart dt=5 g=39 g_seq=2
+GoLabel dt=1 label_string=2
+GoBlock dt=21748 reason_string=15 stack=7
+GoStart dt=10826 g=101 g_seq=2
+HeapAlloc dt=3329 heapalloc_value=202296920
+GoStop dt=64 reason_string=16 stack=3
+GoUnblock dt=16 g=39 g_seq=7 stack=0
+GoStart dt=5 g=39 g_seq=8
+GoLabel dt=2 label_string=2
+GoBlock dt=753 reason_string=15 stack=7
+GoStart dt=10 g=101 g_seq=3
+HeapAlloc dt=29 heapalloc_value=202477144
+HeapAlloc dt=45 heapalloc_value=202534488
+HeapAlloc dt=98 heapalloc_value=202591832
+HeapAlloc dt=47 heapalloc_value=202600024
+HeapAlloc dt=17 heapalloc_value=202649176
+HeapAlloc dt=144 heapalloc_value=202755672
+GoStop dt=51392 reason_string=16 stack=3
+GoStart dt=35 g=101 g_seq=4
+HeapAlloc dt=70 heapalloc_value=205085784
+HeapAlloc dt=58112 heapalloc_value=208591960
+GoStop dt=18 reason_string=16 stack=3
+GoStart dt=21 g=104 g_seq=3
+HeapAlloc dt=72 heapalloc_value=208739416
+HeapAlloc dt=49 heapalloc_value=208854104
+HeapAlloc dt=67 heapalloc_value=209009752
+GoStop dt=41544 reason_string=16 stack=3
+GoStart dt=66 g=58 g_seq=8
+HeapAlloc dt=80 heapalloc_value=212466200
+HeapAlloc dt=11761 heapalloc_value=213989912
+GoStop dt=3879 reason_string=16 stack=3
+ProcStop dt=11
+EventBatch gen=6 m=298975 time=22352100055368 size=212
+ProcStatus dt=1 p=6 pstatus=1
+GoStatus dt=2 g=88 m=298975 gstatus=2
+GCMarkAssistActive dt=1 g=88
+GCMarkAssistEnd dt=7
+HeapAlloc dt=41 heapalloc_value=190880856
+HeapAlloc dt=87 heapalloc_value=190930008
+GCMarkAssistBegin dt=55 stack=2
+GCMarkAssistEnd dt=4370
+HeapAlloc dt=35 heapalloc_value=194197592
+HeapAlloc dt=187 heapalloc_value=194476120
+HeapAlloc dt=108 heapalloc_value=194558040
+HeapAlloc dt=170 heapalloc_value=194902104
+HeapAlloc dt=40 heapalloc_value=194916696
+GCMarkAssistBegin dt=15 stack=2
+GCMarkAssistEnd dt=3044
+HeapAlloc dt=60 heapalloc_value=197620056
+HeapAlloc dt=60 heapalloc_value=197701976
+HeapAlloc dt=41 heapalloc_value=197775704
+HeapAlloc dt=13131 heapalloc_value=200978776
+GoStop dt=22 reason_string=16 stack=3
+GoUnblock dt=12889 g=16 g_seq=3 stack=0
+GoStart dt=8 g=16 g_seq=4
+GoLabel dt=1 label_string=2
+GoBlock dt=1560 reason_string=15 stack=7
+GoStart dt=1275 g=100 g_seq=2
+GoStatus dt=32 g=95 m=18446744073709551615 gstatus=4
+GoUnblock dt=6 g=95 g_seq=1 stack=5
+HeapAlloc dt=78 heapalloc_value=203116120
+GoStop dt=22757 reason_string=16 stack=3
+GoStart dt=16 g=85 g_seq=3
+HeapAlloc dt=60903 heapalloc_value=206576728
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