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Statistics.cpp
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Statistics.cpp
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*-
* vim: set ts=8 sts=2 et sw=2 tw=80:
* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "gc/Statistics.h"
#include "mozilla/ArrayUtils.h"
#include "mozilla/DebugOnly.h"
#include "mozilla/Sprintf.h"
#include "mozilla/TimeStamp.h"
#include <algorithm>
#include <stdarg.h>
#include <stdio.h>
#include <type_traits>
#include "debugger/DebugAPI.h"
#include "gc/GC.h"
#include "gc/Memory.h"
#include "util/Text.h"
#include "vm/HelperThreads.h"
#include "vm/Runtime.h"
#include "vm/Time.h"
#include "gc/PrivateIterators-inl.h"
using namespace js;
using namespace js::gc;
using namespace js::gcstats;
using mozilla::DebugOnly;
using mozilla::EnumeratedArray;
using mozilla::TimeDuration;
using mozilla::TimeStamp;
/*
* If this fails, then you can either delete this assertion and allow all
* larger-numbered reasons to pile up in the last telemetry bucket, or switch
* to GC_REASON_3 and bump the max value.
*/
static_assert(JS::GCReason::NUM_TELEMETRY_REASONS >= JS::GCReason::NUM_REASONS);
static inline auto AllPhaseKinds() {
return mozilla::MakeEnumeratedRange(PhaseKind::FIRST, PhaseKind::LIMIT);
}
static inline auto MajorGCPhaseKinds() {
return mozilla::MakeEnumeratedRange(PhaseKind::GC_BEGIN,
PhaseKind(size_t(PhaseKind::GC_END) + 1));
}
const char* js::gcstats::ExplainInvocationKind(JSGCInvocationKind gckind) {
MOZ_ASSERT(gckind == GC_NORMAL || gckind == GC_SHRINK);
if (gckind == GC_NORMAL) {
return "Normal";
} else {
return "Shrinking";
}
}
JS_PUBLIC_API const char* JS::ExplainGCReason(JS::GCReason reason) {
switch (reason) {
#define SWITCH_REASON(name, _) \
case JS::GCReason::name: \
return #name;
GCREASONS(SWITCH_REASON)
#undef SWITCH_REASON
case JS::GCReason::NO_REASON:
return "NO_REASON";
default:
MOZ_CRASH("bad GC reason");
}
}
JS_PUBLIC_API bool JS::InternalGCReason(JS::GCReason reason) {
return reason < JS::GCReason::FIRST_FIREFOX_REASON;
}
const char* js::gcstats::ExplainAbortReason(gc::AbortReason reason) {
switch (reason) {
#define SWITCH_REASON(name, _) \
case gc::AbortReason::name: \
return #name;
GC_ABORT_REASONS(SWITCH_REASON)
default:
MOZ_CRASH("bad GC abort reason");
#undef SWITCH_REASON
}
}
static FILE* MaybeOpenFileFromEnv(const char* env) {
FILE* file;
const char* value = getenv(env);
if (!value) {
return nullptr;
}
if (strcmp(value, "none") == 0) {
file = nullptr;
} else if (strcmp(value, "stdout") == 0) {
file = stdout;
} else if (strcmp(value, "stderr") == 0) {
file = stderr;
} else {
char path[300];
if (value[0] != '/') {
const char* dir = getenv("MOZ_UPLOAD_DIR");
if (dir) {
SprintfLiteral(path, "%s/%s", dir, value);
value = path;
}
}
file = fopen(value, "a");
if (!file) {
perror("opening log file");
MOZ_CRASH("Failed to open log file.");
}
}
return file;
}
struct PhaseKindInfo {
Phase firstPhase;
uint8_t telemetryBucket;
};
// PhaseInfo objects form a tree.
struct PhaseInfo {
Phase parent;
Phase firstChild;
Phase nextSibling;
Phase nextWithPhaseKind;
PhaseKind phaseKind;
uint8_t depth;
const char* name;
const char* path;
};
// A table of PhaseInfo indexed by Phase.
using PhaseTable = EnumeratedArray<Phase, Phase::LIMIT, PhaseInfo>;
// A table of PhaseKindInfo indexed by PhaseKind.
using PhaseKindTable =
EnumeratedArray<PhaseKind, PhaseKind::LIMIT, PhaseKindInfo>;
#include "gc/StatsPhasesGenerated.inc"
static double t(TimeDuration duration) { return duration.ToMilliseconds(); }
inline JSContext* Statistics::context() {
return gc->rt->mainContextFromOwnThread();
}
inline Phase Statistics::currentPhase() const {
return phaseStack.empty() ? Phase::NONE : phaseStack.back();
}
PhaseKind Statistics::currentPhaseKind() const {
// Public API to get the current phase kind, suppressing the synthetic
// PhaseKind::MUTATOR phase.
Phase phase = currentPhase();
MOZ_ASSERT_IF(phase == Phase::MUTATOR, phaseStack.length() == 1);
if (phase == Phase::NONE || phase == Phase::MUTATOR) {
return PhaseKind::NONE;
}
return phases[phase].phaseKind;
}
Phase Statistics::lookupChildPhase(PhaseKind phaseKind) const {
if (phaseKind == PhaseKind::IMPLICIT_SUSPENSION) {
return Phase::IMPLICIT_SUSPENSION;
}
if (phaseKind == PhaseKind::EXPLICIT_SUSPENSION) {
return Phase::EXPLICIT_SUSPENSION;
}
MOZ_ASSERT(phaseKind < PhaseKind::LIMIT);
// Search all expanded phases that correspond to the required
// phase to find the one whose parent is the current expanded phase.
Phase phase;
for (phase = phaseKinds[phaseKind].firstPhase; phase != Phase::NONE;
phase = phases[phase].nextWithPhaseKind) {
if (phases[phase].parent == currentPhase()) {
break;
}
}
if (phase == Phase::NONE) {
MOZ_CRASH_UNSAFE_PRINTF(
"Child phase kind %u not found under current phase kind %u",
unsigned(phaseKind), unsigned(currentPhaseKind()));
}
return phase;
}
inline auto AllPhases() {
return mozilla::MakeEnumeratedRange(Phase::FIRST, Phase::LIMIT);
}
void Statistics::gcDuration(TimeDuration* total, TimeDuration* maxPause) const {
*total = *maxPause = 0;
for (auto& slice : slices_) {
*total += slice.duration();
if (slice.duration() > *maxPause) {
*maxPause = slice.duration();
}
}
if (*maxPause > maxPauseInInterval) {
maxPauseInInterval = *maxPause;
}
}
void Statistics::sccDurations(TimeDuration* total,
TimeDuration* maxPause) const {
*total = *maxPause = 0;
for (size_t i = 0; i < sccTimes.length(); i++) {
*total += sccTimes[i];
*maxPause = std::max(*maxPause, sccTimes[i]);
}
}
typedef Vector<UniqueChars, 8, SystemAllocPolicy> FragmentVector;
static UniqueChars Join(const FragmentVector& fragments,
const char* separator = "") {
const size_t separatorLength = strlen(separator);
size_t length = 0;
for (size_t i = 0; i < fragments.length(); ++i) {
length += fragments[i] ? strlen(fragments[i].get()) : 0;
if (i < (fragments.length() - 1)) {
length += separatorLength;
}
}
char* joined = js_pod_malloc<char>(length + 1);
if (!joined) {
return UniqueChars();
}
joined[length] = '\0';
char* cursor = joined;
for (size_t i = 0; i < fragments.length(); ++i) {
if (fragments[i]) {
strcpy(cursor, fragments[i].get());
}
cursor += fragments[i] ? strlen(fragments[i].get()) : 0;
if (i < (fragments.length() - 1)) {
if (separatorLength) {
strcpy(cursor, separator);
}
cursor += separatorLength;
}
}
return UniqueChars(joined);
}
static TimeDuration SumChildTimes(
Phase phase, const Statistics::PhaseTimeTable& phaseTimes) {
TimeDuration total = 0;
for (phase = phases[phase].firstChild; phase != Phase::NONE;
phase = phases[phase].nextSibling) {
total += phaseTimes[phase];
}
return total;
}
UniqueChars Statistics::formatCompactSliceMessage() const {
// Skip if we OOM'ed.
if (slices_.length() == 0) {
return UniqueChars(nullptr);
}
const size_t index = slices_.length() - 1;
const SliceData& slice = slices_.back();
char budgetDescription[200];
slice.budget.describe(budgetDescription, sizeof(budgetDescription) - 1);
const char* format =
"GC Slice %u - Pause: %.3fms of %s budget (@ %.3fms); Reason: %s; Reset: "
"%s%s; Times: ";
char buffer[1024];
SprintfLiteral(buffer, format, index, t(slice.duration()), budgetDescription,
t(slice.start - slices_[0].start),
ExplainGCReason(slice.reason),
slice.wasReset() ? "yes - " : "no",
slice.wasReset() ? ExplainAbortReason(slice.resetReason) : "");
FragmentVector fragments;
if (!fragments.append(DuplicateString(buffer)) ||
!fragments.append(
formatCompactSlicePhaseTimes(slices_[index].phaseTimes))) {
return UniqueChars(nullptr);
}
return Join(fragments);
}
UniqueChars Statistics::formatCompactSummaryMessage() const {
const double bytesPerMiB = 1024 * 1024;
FragmentVector fragments;
if (!fragments.append(DuplicateString("Summary - "))) {
return UniqueChars(nullptr);
}
TimeDuration total, longest;
gcDuration(&total, &longest);
const double mmu20 = computeMMU(TimeDuration::FromMilliseconds(20));
const double mmu50 = computeMMU(TimeDuration::FromMilliseconds(50));
char buffer[1024];
if (!nonincremental()) {
SprintfLiteral(buffer,
"Max Pause: %.3fms; MMU 20ms: %.1f%%; MMU 50ms: %.1f%%; "
"Total: %.3fms; ",
t(longest), mmu20 * 100., mmu50 * 100., t(total));
} else {
SprintfLiteral(buffer, "Non-Incremental: %.3fms (%s); ", t(total),
ExplainAbortReason(nonincrementalReason_));
}
if (!fragments.append(DuplicateString(buffer))) {
return UniqueChars(nullptr);
}
SprintfLiteral(buffer,
"Zones: %d of %d (-%d); Compartments: %d of %d (-%d); "
"HeapSize: %.3f MiB; "
"HeapChange (abs): %+d (%u); ",
zoneStats.collectedZoneCount, zoneStats.zoneCount,
zoneStats.sweptZoneCount, zoneStats.collectedCompartmentCount,
zoneStats.compartmentCount, zoneStats.sweptCompartmentCount,
double(preTotalHeapBytes) / bytesPerMiB,
int32_t(counts[COUNT_NEW_CHUNK] - counts[COUNT_DESTROY_CHUNK]),
counts[COUNT_NEW_CHUNK] + counts[COUNT_DESTROY_CHUNK]);
if (!fragments.append(DuplicateString(buffer))) {
return UniqueChars(nullptr);
}
MOZ_ASSERT_IF(counts[COUNT_ARENA_RELOCATED], gckind == GC_SHRINK);
if (gckind == GC_SHRINK) {
SprintfLiteral(
buffer, "Kind: %s; Relocated: %.3f MiB; ",
ExplainInvocationKind(gckind),
double(ArenaSize * counts[COUNT_ARENA_RELOCATED]) / bytesPerMiB);
if (!fragments.append(DuplicateString(buffer))) {
return UniqueChars(nullptr);
}
}
return Join(fragments);
}
UniqueChars Statistics::formatCompactSlicePhaseTimes(
const PhaseTimeTable& phaseTimes) const {
static const TimeDuration MaxUnaccountedTime =
TimeDuration::FromMicroseconds(100);
FragmentVector fragments;
char buffer[128];
for (auto phase : AllPhases()) {
DebugOnly<uint8_t> level = phases[phase].depth;
MOZ_ASSERT(level < 4);
TimeDuration ownTime = phaseTimes[phase];
TimeDuration childTime = SumChildTimes(phase, phaseTimes);
if (ownTime > MaxUnaccountedTime) {
SprintfLiteral(buffer, "%s: %.3fms", phases[phase].name, t(ownTime));
if (!fragments.append(DuplicateString(buffer))) {
return UniqueChars(nullptr);
}
if (childTime && (ownTime - childTime) > MaxUnaccountedTime) {
MOZ_ASSERT(level < 3);
SprintfLiteral(buffer, "%s: %.3fms", "Other", t(ownTime - childTime));
if (!fragments.append(DuplicateString(buffer))) {
return UniqueChars(nullptr);
}
}
}
}
return Join(fragments, ", ");
}
UniqueChars Statistics::formatDetailedMessage() const {
FragmentVector fragments;
if (!fragments.append(formatDetailedDescription())) {
return UniqueChars(nullptr);
}
if (!slices_.empty()) {
for (unsigned i = 0; i < slices_.length(); i++) {
if (!fragments.append(formatDetailedSliceDescription(i, slices_[i]))) {
return UniqueChars(nullptr);
}
if (!fragments.append(formatDetailedPhaseTimes(slices_[i].phaseTimes))) {
return UniqueChars(nullptr);
}
}
}
if (!fragments.append(formatDetailedTotals())) {
return UniqueChars(nullptr);
}
if (!fragments.append(formatDetailedPhaseTimes(phaseTimes))) {
return UniqueChars(nullptr);
}
return Join(fragments);
}
UniqueChars Statistics::formatDetailedDescription() const {
const double bytesPerMiB = 1024 * 1024;
TimeDuration sccTotal, sccLongest;
sccDurations(&sccTotal, &sccLongest);
const double mmu20 = computeMMU(TimeDuration::FromMilliseconds(20));
const double mmu50 = computeMMU(TimeDuration::FromMilliseconds(50));
const char* format =
"=================================================================\n\
Invocation Kind: %s\n\
Reason: %s\n\
Incremental: %s%s\n\
Zones Collected: %d of %d (-%d)\n\
Compartments Collected: %d of %d (-%d)\n\
MinorGCs since last GC: %d\n\
Store Buffer Overflows: %d\n\
MMU 20ms:%.1f%%; 50ms:%.1f%%\n\
SCC Sweep Total (MaxPause): %.3fms (%.3fms)\n\
HeapSize: %.3f MiB\n\
Chunk Delta (magnitude): %+d (%d)\n\
Arenas Relocated: %.3f MiB\n\
Trigger: %s\n\
";
char thresholdBuffer[100] = "n/a";
if (thresholdTriggered) {
SprintfLiteral(thresholdBuffer, "%.3f MiB of %.3f MiB threshold\n",
triggerAmount / 1024.0 / 1024.0,
triggerThreshold / 1024.0 / 1024.0);
}
char buffer[1024];
SprintfLiteral(
buffer, format, ExplainInvocationKind(gckind),
ExplainGCReason(slices_[0].reason), nonincremental() ? "no - " : "yes",
nonincremental() ? ExplainAbortReason(nonincrementalReason_) : "",
zoneStats.collectedZoneCount, zoneStats.zoneCount,
zoneStats.sweptZoneCount, zoneStats.collectedCompartmentCount,
zoneStats.compartmentCount, zoneStats.sweptCompartmentCount,
getCount(COUNT_MINOR_GC), getCount(COUNT_STOREBUFFER_OVERFLOW),
mmu20 * 100., mmu50 * 100., t(sccTotal), t(sccLongest),
double(preTotalHeapBytes) / bytesPerMiB,
getCount(COUNT_NEW_CHUNK) - getCount(COUNT_DESTROY_CHUNK),
getCount(COUNT_NEW_CHUNK) + getCount(COUNT_DESTROY_CHUNK),
double(ArenaSize * getCount(COUNT_ARENA_RELOCATED)) / bytesPerMiB,
thresholdBuffer);
return DuplicateString(buffer);
}
UniqueChars Statistics::formatDetailedSliceDescription(
unsigned i, const SliceData& slice) const {
char budgetDescription[200];
slice.budget.describe(budgetDescription, sizeof(budgetDescription) - 1);
const char* format =
"\
---- Slice %u ----\n\
Reason: %s\n\
Reset: %s%s\n\
State: %s -> %s\n\
Page Faults: %" PRIu64
"\n\
Pause: %.3fms of %s budget (@ %.3fms)\n\
";
char buffer[1024];
SprintfLiteral(
buffer, format, i, ExplainGCReason(slice.reason),
slice.wasReset() ? "yes - " : "no",
slice.wasReset() ? ExplainAbortReason(slice.resetReason) : "",
gc::StateName(slice.initialState), gc::StateName(slice.finalState),
uint64_t(slice.endFaults - slice.startFaults), t(slice.duration()),
budgetDescription, t(slice.start - slices_[0].start));
return DuplicateString(buffer);
}
static bool IncludePhase(TimeDuration duration) {
// Don't include durations that will print as "0.000ms".
return duration.ToMilliseconds() >= 0.001;
}
UniqueChars Statistics::formatDetailedPhaseTimes(
const PhaseTimeTable& phaseTimes) const {
static const TimeDuration MaxUnaccountedChildTime =
TimeDuration::FromMicroseconds(50);
FragmentVector fragments;
char buffer[128];
for (auto phase : AllPhases()) {
uint8_t level = phases[phase].depth;
TimeDuration ownTime = phaseTimes[phase];
TimeDuration childTime = SumChildTimes(phase, phaseTimes);
if (IncludePhase(ownTime)) {
SprintfLiteral(buffer, " %*s%s: %.3fms\n", level * 2, "",
phases[phase].name, t(ownTime));
if (!fragments.append(DuplicateString(buffer))) {
return UniqueChars(nullptr);
}
if (childTime && (ownTime - childTime) > MaxUnaccountedChildTime) {
SprintfLiteral(buffer, " %*s%s: %.3fms\n", (level + 1) * 2, "",
"Other", t(ownTime - childTime));
if (!fragments.append(DuplicateString(buffer))) {
return UniqueChars(nullptr);
}
}
}
}
return Join(fragments);
}
UniqueChars Statistics::formatDetailedTotals() const {
TimeDuration total, longest;
gcDuration(&total, &longest);
const char* format =
"\
---- Totals ----\n\
Total Time: %.3fms\n\
Max Pause: %.3fms\n\
";
char buffer[1024];
SprintfLiteral(buffer, format, t(total), t(longest));
return DuplicateString(buffer);
}
void Statistics::formatJsonSlice(size_t sliceNum, JSONPrinter& json) const {
/*
* We number each of the slice properties to keep the code in
* GCTelemetry.jsm in sync. See MAX_SLICE_KEYS.
*/
json.beginObject();
formatJsonSliceDescription(sliceNum, slices_[sliceNum], json); // # 1-11
json.beginObjectProperty("times"); // # 12
formatJsonPhaseTimes(slices_[sliceNum].phaseTimes, json);
json.endObject();
json.endObject();
}
UniqueChars Statistics::renderJsonSlice(size_t sliceNum) const {
Sprinter printer(nullptr, false);
if (!printer.init()) {
return UniqueChars(nullptr);
}
JSONPrinter json(printer);
formatJsonSlice(sliceNum, json);
return printer.release();
}
UniqueChars Statistics::renderNurseryJson() const {
Sprinter printer(nullptr, false);
if (!printer.init()) {
return UniqueChars(nullptr);
}
JSONPrinter json(printer);
gc->nursery().renderProfileJSON(json);
return printer.release();
}
#ifdef DEBUG
void Statistics::writeLogMessage(const char* fmt, ...) {
va_list args;
va_start(args, fmt);
if (gcDebugFile) {
TimeDuration sinceStart = TimeStamp::Now() - TimeStamp::ProcessCreation();
fprintf(gcDebugFile, "%12.3f: ", sinceStart.ToMicroseconds());
vfprintf(gcDebugFile, fmt, args);
fprintf(gcDebugFile, "\n");
fflush(gcDebugFile);
}
va_end(args);
}
#endif
UniqueChars Statistics::renderJsonMessage(uint64_t timestamp,
Statistics::JSONUse use) const {
/*
* The format of the JSON message is specified by the GCMajorMarkerPayload
* type in profiler.firefox.com
* https://github.com/firefox-devtools/profiler/blob/master/src/types/markers.js#L62
*
* All the properties listed here are created within the timings property
* of the GCMajor marker.
*/
if (aborted) {
return DuplicateString("{status:\"aborted\"}"); // May return nullptr
}
Sprinter printer(nullptr, false);
if (!printer.init()) {
return UniqueChars(nullptr);
}
JSONPrinter json(printer);
json.beginObject();
json.property("status", "completed"); // JSON Key #1
formatJsonDescription(timestamp, json, use); // #2-22
if (use == Statistics::JSONUse::TELEMETRY) {
json.beginListProperty("slices_list"); // #23
for (unsigned i = 0; i < slices_.length(); i++) {
formatJsonSlice(i, json);
}
json.endList();
}
json.beginObjectProperty("totals"); // #24
formatJsonPhaseTimes(phaseTimes, json);
json.endObject();
json.endObject();
return printer.release();
}
void Statistics::formatJsonDescription(uint64_t timestamp, JSONPrinter& json,
JSONUse use) const {
// If you change JSON properties here, please update:
// Telemetry ping code:
// toolkit/components/telemetry/other/GCTelemetry.jsm
// Telemetry documentation:
// toolkit/components/telemetry/docs/data/main-ping.rst
// Telemetry tests:
// toolkit/components/telemetry/tests/browser/browser_TelemetryGC.js,
// toolkit/components/telemetry/tests/unit/test_TelemetryGC.js
// Firefox Profiler:
// https://github.com/firefox-devtools/profiler
//
// Please also number each property to help correctly maintain the Telemetry
// ping code
json.property("timestamp", timestamp); // # JSON Key #2
TimeDuration total, longest;
gcDuration(&total, &longest);
json.property("max_pause", longest, JSONPrinter::MILLISECONDS); // #3
json.property("total_time", total, JSONPrinter::MILLISECONDS); // #4
// We might be able to omit reason if profiler.firefox.com was able to retrive
// it from the first slice. But it doesn't do this yet.
json.property("reason", ExplainGCReason(slices_[0].reason)); // #5
json.property("zones_collected", zoneStats.collectedZoneCount); // #6
json.property("total_zones", zoneStats.zoneCount); // #7
json.property("total_compartments", zoneStats.compartmentCount); // #8
json.property("minor_gcs", getCount(COUNT_MINOR_GC)); // #9
uint32_t storebufferOverflows = getCount(COUNT_STOREBUFFER_OVERFLOW);
if (storebufferOverflows) {
json.property("store_buffer_overflows", storebufferOverflows); // #10
}
json.property("slices", slices_.length()); // #11
const double mmu20 = computeMMU(TimeDuration::FromMilliseconds(20));
const double mmu50 = computeMMU(TimeDuration::FromMilliseconds(50));
json.property("mmu_20ms", int(mmu20 * 100)); // #12
json.property("mmu_50ms", int(mmu50 * 100)); // #13
TimeDuration sccTotal, sccLongest;
sccDurations(&sccTotal, &sccLongest);
json.property("scc_sweep_total", sccTotal, JSONPrinter::MILLISECONDS); // #14
json.property("scc_sweep_max_pause", sccLongest,
JSONPrinter::MILLISECONDS); // #15
if (nonincrementalReason_ != AbortReason::None) {
json.property("nonincremental_reason",
ExplainAbortReason(nonincrementalReason_)); // #16
}
json.property("allocated_bytes", preTotalHeapBytes); // #17
if (use == Statistics::JSONUse::PROFILER) {
json.property("post_heap_size", postTotalHeapBytes);
}
uint32_t addedChunks = getCount(COUNT_NEW_CHUNK);
if (addedChunks) {
json.property("added_chunks", addedChunks); // #18
}
uint32_t removedChunks = getCount(COUNT_DESTROY_CHUNK);
if (removedChunks) {
json.property("removed_chunks", removedChunks); // #19
}
json.property("major_gc_number", startingMajorGCNumber); // #20
json.property("minor_gc_number", startingMinorGCNumber); // #21
json.property("slice_number", startingSliceNumber); // #22
}
void Statistics::formatJsonSliceDescription(unsigned i, const SliceData& slice,
JSONPrinter& json) const {
// If you change JSON properties here, please update:
// Telemetry ping code:
// toolkit/components/telemetry/other/GCTelemetry.jsm
// Telemetry documentation:
// toolkit/components/telemetry/docs/data/main-ping.rst
// Telemetry tests:
// toolkit/components/telemetry/tests/browser/browser_TelemetryGC.js,
// toolkit/components/telemetry/tests/unit/test_TelemetryGC.js
// Firefox Profiler:
// https://github.com/firefox-devtools/profiler
//
char budgetDescription[200];
slice.budget.describe(budgetDescription, sizeof(budgetDescription) - 1);
TimeStamp originTime = TimeStamp::ProcessCreation();
json.property("slice", i); // JSON Property #1
json.property("pause", slice.duration(), JSONPrinter::MILLISECONDS); // #2
json.property("reason", ExplainGCReason(slice.reason)); // #3
json.property("initial_state", gc::StateName(slice.initialState)); // #4
json.property("final_state", gc::StateName(slice.finalState)); // #5
json.property("budget", budgetDescription); // #6
json.property("major_gc_number", startingMajorGCNumber); // #7
if (thresholdTriggered) {
json.floatProperty("trigger_amount", triggerAmount, 0); // #8
json.floatProperty("trigger_threshold", triggerThreshold, 0); // #9
}
int64_t numFaults = slice.endFaults - slice.startFaults;
if (numFaults != 0) {
json.property("page_faults", numFaults); // #10
}
json.property("start_timestamp", slice.start - originTime,
JSONPrinter::SECONDS); // #11
}
void Statistics::formatJsonPhaseTimes(const PhaseTimeTable& phaseTimes,
JSONPrinter& json) const {
for (auto phase : AllPhases()) {
TimeDuration ownTime = phaseTimes[phase];
if (!ownTime.IsZero()) {
json.property(phases[phase].path, ownTime, JSONPrinter::MILLISECONDS);
}
}
}
Statistics::Statistics(GCRuntime* gc)
: gc(gc),
gcTimerFile(nullptr),
gcDebugFile(nullptr),
nonincrementalReason_(gc::AbortReason::None),
allocsSinceMinorGC({0, 0}),
preTotalHeapBytes(0),
postTotalHeapBytes(0),
preCollectedHeapBytes(0),
thresholdTriggered(false),
triggerAmount(0.0),
triggerThreshold(0.0),
startingMinorGCNumber(0),
startingMajorGCNumber(0),
startingSliceNumber(0),
maxPauseInInterval(0),
sliceCallback(nullptr),
nurseryCollectionCallback(nullptr),
aborted(false),
enableProfiling_(false),
sliceCount_(0) {
for (auto& count : counts) {
count = 0;
}
for (auto& stat : stats) {
stat = 0;
}
#ifdef DEBUG
for (const auto& duration : totalTimes_) {
using ElementType = std::remove_reference_t<decltype(duration)>;
static_assert(!std::is_trivially_constructible<ElementType>::value,
"Statistics::Statistics will only initialize "
"totalTimes_'s elements if their default constructor is "
"non-trivial");
MOZ_ASSERT(duration.IsZero(),
"totalTimes_ default-initialization should have "
"default-initialized every element of totalTimes_ to zero");
}
#endif
MOZ_ALWAYS_TRUE(phaseStack.reserve(MAX_PHASE_NESTING));
MOZ_ALWAYS_TRUE(suspendedPhases.reserve(MAX_SUSPENDED_PHASES));
gcTimerFile = MaybeOpenFileFromEnv("MOZ_GCTIMER");
gcDebugFile = MaybeOpenFileFromEnv("JS_GC_DEBUG");
const char* env = getenv("JS_GC_PROFILE");
if (env) {
if (0 == strcmp(env, "help")) {
fprintf(stderr,
"JS_GC_PROFILE=N\n"
"\tReport major GC's taking more than N milliseconds.\n");
exit(0);
}
enableProfiling_ = true;
profileThreshold_ = TimeDuration::FromMilliseconds(atoi(env));
}
}
Statistics::~Statistics() {
if (gcTimerFile && gcTimerFile != stdout && gcTimerFile != stderr) {
fclose(gcTimerFile);
}
if (gcDebugFile && gcDebugFile != stdout && gcDebugFile != stderr) {
fclose(gcDebugFile);
}
}
/* static */
bool Statistics::initialize() {
#ifdef DEBUG
// Sanity check generated tables.
for (auto i : AllPhases()) {
auto parent = phases[i].parent;
if (parent != Phase::NONE) {
MOZ_ASSERT(phases[i].depth == phases[parent].depth + 1);
}
auto firstChild = phases[i].firstChild;
if (firstChild != Phase::NONE) {
MOZ_ASSERT(i == phases[firstChild].parent);
MOZ_ASSERT(phases[i].depth == phases[firstChild].depth - 1);
}
auto nextSibling = phases[i].nextSibling;
if (nextSibling != Phase::NONE) {
MOZ_ASSERT(parent == phases[nextSibling].parent);
MOZ_ASSERT(phases[i].depth == phases[nextSibling].depth);
}
auto nextWithPhaseKind = phases[i].nextWithPhaseKind;
if (nextWithPhaseKind != Phase::NONE) {
MOZ_ASSERT(phases[i].phaseKind == phases[nextWithPhaseKind].phaseKind);
MOZ_ASSERT(parent != phases[nextWithPhaseKind].parent);
}
}
for (auto i : AllPhaseKinds()) {
MOZ_ASSERT(phases[phaseKinds[i].firstPhase].phaseKind == i);
for (auto j : AllPhaseKinds()) {
MOZ_ASSERT_IF(i != j, phaseKinds[i].telemetryBucket !=
phaseKinds[j].telemetryBucket);
}
}
#endif
return true;
}
JS::GCSliceCallback Statistics::setSliceCallback(
JS::GCSliceCallback newCallback) {
JS::GCSliceCallback oldCallback = sliceCallback;
sliceCallback = newCallback;
return oldCallback;
}
JS::GCNurseryCollectionCallback Statistics::setNurseryCollectionCallback(
JS::GCNurseryCollectionCallback newCallback) {
auto oldCallback = nurseryCollectionCallback;
nurseryCollectionCallback = newCallback;
return oldCallback;
}
TimeDuration Statistics::clearMaxGCPauseAccumulator() {
TimeDuration prior = maxPauseInInterval;
maxPauseInInterval = 0;
return prior;
}
TimeDuration Statistics::getMaxGCPauseSinceClear() {
return maxPauseInInterval;
}
// Sum up the time for a phase, including instances of the phase with different
// parents.
static TimeDuration SumPhase(PhaseKind phaseKind,
const Statistics::PhaseTimeTable& times) {
TimeDuration sum = 0;
for (Phase phase = phaseKinds[phaseKind].firstPhase; phase != Phase::NONE;
phase = phases[phase].nextWithPhaseKind) {
sum += times[phase];
}
return sum;
}
static bool CheckSelfTime(Phase parent, Phase child,
const Statistics::PhaseTimeTable& times,
const Statistics::PhaseTimeTable& selfTimes,
TimeDuration childTime) {
if (selfTimes[parent] < childTime) {
fprintf(
stderr,
"Parent %s time = %.3fms with %.3fms remaining, child %s time %.3fms\n",
phases[parent].name, times[parent].ToMilliseconds(),
selfTimes[parent].ToMilliseconds(), phases[child].name,
childTime.ToMilliseconds());
fflush(stderr);
return false;
}
return true;
}
static PhaseKind LongestPhaseSelfTimeInMajorGC(
const Statistics::PhaseTimeTable& times) {
// Start with total times per expanded phase, including children's times.
Statistics::PhaseTimeTable selfTimes(times);
// We have the total time spent in each phase, including descendant times.
// Loop over the children and subtract their times from their parent's self
// time.
for (auto i : AllPhases()) {
Phase parent = phases[i].parent;
if (parent != Phase::NONE) {
bool ok = CheckSelfTime(parent, i, times, selfTimes, times[i]);
// This happens very occasionally in release builds and frequently
// in Windows debug builds. Skip collecting longest phase telemetry
// if it does.
#ifndef XP_WIN
MOZ_ASSERT(ok, "Inconsistent time data; see bug 1400153");
#endif
if (!ok) {
return PhaseKind::NONE;
}
selfTimes[parent] -= times[i];
}
}
// Sum expanded phases corresponding to the same phase.
EnumeratedArray<PhaseKind, PhaseKind::LIMIT, TimeDuration> phaseTimes;
for (auto i : AllPhaseKinds()) {
phaseTimes[i] = SumPhase(i, selfTimes);
}
// Loop over this table to find the longest phase.
TimeDuration longestTime = 0;
PhaseKind longestPhase = PhaseKind::NONE;
for (auto i : MajorGCPhaseKinds()) {
if (phaseTimes[i] > longestTime) {
longestTime = phaseTimes[i];
longestPhase = i;
}
}
return longestPhase;
}
void Statistics::printStats() {
if (aborted) {
fprintf(gcTimerFile,
"OOM during GC statistics collection. The report is unavailable "
"for this GC.\n");
} else {
UniqueChars msg = formatDetailedMessage();
if (msg) {
double secSinceStart =
(slices_[0].start - TimeStamp::ProcessCreation()).ToSeconds();
fprintf(gcTimerFile, "GC(T+%.3fs) %s\n", secSinceStart, msg.get());
}
}
fflush(gcTimerFile);
}
void Statistics::beginGC(JSGCInvocationKind kind,
const TimeStamp& currentTime) {
slices_.clearAndFree();
sccTimes.clearAndFree();
gckind = kind;
nonincrementalReason_ = gc::AbortReason::None;
preTotalHeapBytes = gc->heapSize.bytes();
preCollectedHeapBytes = 0;
startingMajorGCNumber = gc->majorGCCount();
startingSliceNumber = gc->gcNumber();
if (gc->lastGCEndTime()) {
timeSinceLastGC = currentTime - gc->lastGCEndTime();
}
}