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1060 lines
39 KiB
1060 lines
39 KiB
/*
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* Copyright (C) 2011 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#include "trace.h"
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#include <sys/uio.h>
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#include <unistd.h>
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#include "android-base/macros.h"
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#include "android-base/stringprintf.h"
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#include "art_method-inl.h"
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#include "base/casts.h"
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#include "base/enums.h"
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#include "base/os.h"
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#include "base/stl_util.h"
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#include "base/systrace.h"
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#include "base/time_utils.h"
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#include "base/unix_file/fd_file.h"
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#include "base/utils.h"
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#include "class_linker.h"
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#include "common_throws.h"
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#include "debugger.h"
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#include "dex/descriptors_names.h"
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#include "dex/dex_file-inl.h"
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#include "entrypoints/quick/quick_entrypoints.h"
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#include "gc/scoped_gc_critical_section.h"
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#include "instrumentation.h"
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#include "jit/jit.h"
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#include "jit/jit_code_cache.h"
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#include "mirror/class-inl.h"
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#include "mirror/dex_cache-inl.h"
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#include "mirror/object-inl.h"
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#include "mirror/object_array-inl.h"
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#include "nativehelper/scoped_local_ref.h"
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#include "scoped_thread_state_change-inl.h"
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#include "stack.h"
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#include "thread.h"
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#include "thread_list.h"
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namespace art {
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using android::base::StringPrintf;
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static constexpr size_t TraceActionBits = MinimumBitsToStore(
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static_cast<size_t>(kTraceMethodActionMask));
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static constexpr uint8_t kOpNewMethod = 1U;
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static constexpr uint8_t kOpNewThread = 2U;
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static constexpr uint8_t kOpTraceSummary = 3U;
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static const char kTraceTokenChar = '*';
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static const uint16_t kTraceHeaderLength = 32;
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static const uint32_t kTraceMagicValue = 0x574f4c53;
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static const uint16_t kTraceVersionSingleClock = 2;
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static const uint16_t kTraceVersionDualClock = 3;
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static const uint16_t kTraceRecordSizeSingleClock = 10; // using v2
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static const uint16_t kTraceRecordSizeDualClock = 14; // using v3 with two timestamps
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TraceClockSource Trace::default_clock_source_ = kDefaultTraceClockSource;
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Trace* volatile Trace::the_trace_ = nullptr;
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pthread_t Trace::sampling_pthread_ = 0U;
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std::unique_ptr<std::vector<ArtMethod*>> Trace::temp_stack_trace_;
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// The key identifying the tracer to update instrumentation.
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static constexpr const char* kTracerInstrumentationKey = "Tracer";
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static TraceAction DecodeTraceAction(uint32_t tmid) {
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return static_cast<TraceAction>(tmid & kTraceMethodActionMask);
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}
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ArtMethod* Trace::DecodeTraceMethod(uint32_t tmid) {
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MutexLock mu(Thread::Current(), *unique_methods_lock_);
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return unique_methods_[tmid >> TraceActionBits];
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}
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uint32_t Trace::EncodeTraceMethod(ArtMethod* method) {
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MutexLock mu(Thread::Current(), *unique_methods_lock_);
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uint32_t idx;
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auto it = art_method_id_map_.find(method);
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if (it != art_method_id_map_.end()) {
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idx = it->second;
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} else {
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unique_methods_.push_back(method);
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idx = unique_methods_.size() - 1;
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art_method_id_map_.emplace(method, idx);
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}
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DCHECK_LT(idx, unique_methods_.size());
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DCHECK_EQ(unique_methods_[idx], method);
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return idx;
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}
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uint32_t Trace::EncodeTraceMethodAndAction(ArtMethod* method, TraceAction action) {
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uint32_t tmid = (EncodeTraceMethod(method) << TraceActionBits) | action;
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DCHECK_EQ(method, DecodeTraceMethod(tmid));
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return tmid;
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}
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std::vector<ArtMethod*>* Trace::AllocStackTrace() {
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return (temp_stack_trace_.get() != nullptr) ? temp_stack_trace_.release() :
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new std::vector<ArtMethod*>();
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}
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void Trace::FreeStackTrace(std::vector<ArtMethod*>* stack_trace) {
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stack_trace->clear();
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temp_stack_trace_.reset(stack_trace);
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}
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void Trace::SetDefaultClockSource(TraceClockSource clock_source) {
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#if defined(__linux__)
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default_clock_source_ = clock_source;
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#else
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if (clock_source != TraceClockSource::kWall) {
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LOG(WARNING) << "Ignoring tracing request to use CPU time.";
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}
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#endif
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}
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static uint16_t GetTraceVersion(TraceClockSource clock_source) {
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return (clock_source == TraceClockSource::kDual) ? kTraceVersionDualClock
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: kTraceVersionSingleClock;
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}
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static uint16_t GetRecordSize(TraceClockSource clock_source) {
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return (clock_source == TraceClockSource::kDual) ? kTraceRecordSizeDualClock
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: kTraceRecordSizeSingleClock;
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}
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bool Trace::UseThreadCpuClock() {
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return (clock_source_ == TraceClockSource::kThreadCpu) ||
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(clock_source_ == TraceClockSource::kDual);
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}
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bool Trace::UseWallClock() {
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return (clock_source_ == TraceClockSource::kWall) ||
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(clock_source_ == TraceClockSource::kDual);
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}
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void Trace::MeasureClockOverhead() {
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if (UseThreadCpuClock()) {
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Thread::Current()->GetCpuMicroTime();
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}
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if (UseWallClock()) {
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MicroTime();
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}
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}
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// Compute an average time taken to measure clocks.
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uint32_t Trace::GetClockOverheadNanoSeconds() {
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Thread* self = Thread::Current();
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uint64_t start = self->GetCpuMicroTime();
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for (int i = 4000; i > 0; i--) {
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MeasureClockOverhead();
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MeasureClockOverhead();
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MeasureClockOverhead();
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MeasureClockOverhead();
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MeasureClockOverhead();
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MeasureClockOverhead();
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MeasureClockOverhead();
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MeasureClockOverhead();
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}
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uint64_t elapsed_us = self->GetCpuMicroTime() - start;
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return static_cast<uint32_t>(elapsed_us / 32);
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}
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// TODO: put this somewhere with the big-endian equivalent used by JDWP.
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static void Append2LE(uint8_t* buf, uint16_t val) {
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*buf++ = static_cast<uint8_t>(val);
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*buf++ = static_cast<uint8_t>(val >> 8);
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}
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// TODO: put this somewhere with the big-endian equivalent used by JDWP.
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static void Append4LE(uint8_t* buf, uint32_t val) {
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*buf++ = static_cast<uint8_t>(val);
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*buf++ = static_cast<uint8_t>(val >> 8);
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*buf++ = static_cast<uint8_t>(val >> 16);
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*buf++ = static_cast<uint8_t>(val >> 24);
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}
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// TODO: put this somewhere with the big-endian equivalent used by JDWP.
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static void Append8LE(uint8_t* buf, uint64_t val) {
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*buf++ = static_cast<uint8_t>(val);
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*buf++ = static_cast<uint8_t>(val >> 8);
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*buf++ = static_cast<uint8_t>(val >> 16);
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*buf++ = static_cast<uint8_t>(val >> 24);
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*buf++ = static_cast<uint8_t>(val >> 32);
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*buf++ = static_cast<uint8_t>(val >> 40);
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*buf++ = static_cast<uint8_t>(val >> 48);
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*buf++ = static_cast<uint8_t>(val >> 56);
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}
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static void GetSample(Thread* thread, void* arg) REQUIRES_SHARED(Locks::mutator_lock_) {
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std::vector<ArtMethod*>* const stack_trace = Trace::AllocStackTrace();
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StackVisitor::WalkStack(
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[&](const art::StackVisitor* stack_visitor) REQUIRES_SHARED(Locks::mutator_lock_) {
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ArtMethod* m = stack_visitor->GetMethod();
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// Ignore runtime frames (in particular callee save).
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if (!m->IsRuntimeMethod()) {
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stack_trace->push_back(m);
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}
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return true;
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},
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thread,
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/* context= */ nullptr,
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art::StackVisitor::StackWalkKind::kIncludeInlinedFrames);
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Trace* the_trace = reinterpret_cast<Trace*>(arg);
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the_trace->CompareAndUpdateStackTrace(thread, stack_trace);
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}
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static void ClearThreadStackTraceAndClockBase(Thread* thread, void* arg ATTRIBUTE_UNUSED) {
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thread->SetTraceClockBase(0);
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std::vector<ArtMethod*>* stack_trace = thread->GetStackTraceSample();
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thread->SetStackTraceSample(nullptr);
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delete stack_trace;
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}
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void Trace::CompareAndUpdateStackTrace(Thread* thread,
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std::vector<ArtMethod*>* stack_trace) {
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CHECK_EQ(pthread_self(), sampling_pthread_);
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std::vector<ArtMethod*>* old_stack_trace = thread->GetStackTraceSample();
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// Update the thread's stack trace sample.
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thread->SetStackTraceSample(stack_trace);
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// Read timer clocks to use for all events in this trace.
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uint32_t thread_clock_diff = 0;
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uint32_t wall_clock_diff = 0;
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ReadClocks(thread, &thread_clock_diff, &wall_clock_diff);
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if (old_stack_trace == nullptr) {
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// If there's no previous stack trace sample for this thread, log an entry event for all
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// methods in the trace.
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for (auto rit = stack_trace->rbegin(); rit != stack_trace->rend(); ++rit) {
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LogMethodTraceEvent(thread, *rit, instrumentation::Instrumentation::kMethodEntered,
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thread_clock_diff, wall_clock_diff);
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}
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} else {
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// If there's a previous stack trace for this thread, diff the traces and emit entry and exit
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// events accordingly.
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auto old_rit = old_stack_trace->rbegin();
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auto rit = stack_trace->rbegin();
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// Iterate bottom-up over both traces until there's a difference between them.
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while (old_rit != old_stack_trace->rend() && rit != stack_trace->rend() && *old_rit == *rit) {
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old_rit++;
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rit++;
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}
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// Iterate top-down over the old trace until the point where they differ, emitting exit events.
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for (auto old_it = old_stack_trace->begin(); old_it != old_rit.base(); ++old_it) {
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LogMethodTraceEvent(thread, *old_it, instrumentation::Instrumentation::kMethodExited,
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thread_clock_diff, wall_clock_diff);
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}
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// Iterate bottom-up over the new trace from the point where they differ, emitting entry events.
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for (; rit != stack_trace->rend(); ++rit) {
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LogMethodTraceEvent(thread, *rit, instrumentation::Instrumentation::kMethodEntered,
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thread_clock_diff, wall_clock_diff);
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}
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FreeStackTrace(old_stack_trace);
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}
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}
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void* Trace::RunSamplingThread(void* arg) {
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Runtime* runtime = Runtime::Current();
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intptr_t interval_us = reinterpret_cast<intptr_t>(arg);
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CHECK_GE(interval_us, 0);
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CHECK(runtime->AttachCurrentThread("Sampling Profiler", true, runtime->GetSystemThreadGroup(),
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!runtime->IsAotCompiler()));
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while (true) {
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usleep(interval_us);
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ScopedTrace trace("Profile sampling");
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Thread* self = Thread::Current();
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Trace* the_trace;
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{
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MutexLock mu(self, *Locks::trace_lock_);
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the_trace = the_trace_;
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if (the_trace == nullptr) {
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break;
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}
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}
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{
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// Avoid a deadlock between a thread doing garbage collection
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// and the profile sampling thread, by blocking GC when sampling
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// thread stacks (see b/73624630).
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gc::ScopedGCCriticalSection gcs(self,
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art::gc::kGcCauseInstrumentation,
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art::gc::kCollectorTypeInstrumentation);
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ScopedSuspendAll ssa(__FUNCTION__);
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MutexLock mu(self, *Locks::thread_list_lock_);
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runtime->GetThreadList()->ForEach(GetSample, the_trace);
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}
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}
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runtime->DetachCurrentThread();
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return nullptr;
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}
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void Trace::Start(const char* trace_filename,
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size_t buffer_size,
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int flags,
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TraceOutputMode output_mode,
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TraceMode trace_mode,
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int interval_us) {
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std::unique_ptr<File> file(OS::CreateEmptyFileWriteOnly(trace_filename));
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if (file == nullptr) {
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std::string msg = android::base::StringPrintf("Unable to open trace file '%s'", trace_filename);
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PLOG(ERROR) << msg;
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ScopedObjectAccess soa(Thread::Current());
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Thread::Current()->ThrowNewException("Ljava/lang/RuntimeException;", msg.c_str());
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return;
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}
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Start(std::move(file), buffer_size, flags, output_mode, trace_mode, interval_us);
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}
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void Trace::Start(int trace_fd,
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size_t buffer_size,
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int flags,
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TraceOutputMode output_mode,
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TraceMode trace_mode,
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int interval_us) {
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if (trace_fd < 0) {
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std::string msg = android::base::StringPrintf("Unable to start tracing with invalid fd %d",
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trace_fd);
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LOG(ERROR) << msg;
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ScopedObjectAccess soa(Thread::Current());
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Thread::Current()->ThrowNewException("Ljava/lang/RuntimeException;", msg.c_str());
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return;
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}
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std::unique_ptr<File> file(new File(trace_fd, /* path= */ "tracefile", /* check_usage= */ true));
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Start(std::move(file), buffer_size, flags, output_mode, trace_mode, interval_us);
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}
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void Trace::StartDDMS(size_t buffer_size,
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int flags,
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TraceMode trace_mode,
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int interval_us) {
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Start(std::unique_ptr<File>(),
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buffer_size,
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flags,
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TraceOutputMode::kDDMS,
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trace_mode,
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interval_us);
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}
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void Trace::Start(std::unique_ptr<File>&& trace_file_in,
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size_t buffer_size,
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int flags,
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TraceOutputMode output_mode,
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TraceMode trace_mode,
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int interval_us) {
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// We own trace_file now and are responsible for closing it. To account for error situations, use
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// a specialized unique_ptr to ensure we close it on the way out (if it hasn't been passed to a
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// Trace instance).
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auto deleter = [](File* file) {
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if (file != nullptr) {
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file->MarkUnchecked(); // Don't deal with flushing requirements.
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int result ATTRIBUTE_UNUSED = file->Close();
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delete file;
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}
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};
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std::unique_ptr<File, decltype(deleter)> trace_file(trace_file_in.release(), deleter);
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Thread* self = Thread::Current();
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{
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MutexLock mu(self, *Locks::trace_lock_);
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if (the_trace_ != nullptr) {
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LOG(ERROR) << "Trace already in progress, ignoring this request";
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return;
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}
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}
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// Check interval if sampling is enabled
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if (trace_mode == TraceMode::kSampling && interval_us <= 0) {
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LOG(ERROR) << "Invalid sampling interval: " << interval_us;
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ScopedObjectAccess soa(self);
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ThrowRuntimeException("Invalid sampling interval: %d", interval_us);
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return;
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}
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Runtime* runtime = Runtime::Current();
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// Enable count of allocs if specified in the flags.
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bool enable_stats = false;
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if (runtime->GetJit() != nullptr) {
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// TODO b/110263880 It would be better if we didn't need to do this.
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// Since we need to hold the method entrypoint across a suspend to ensure instrumentation
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// hooks are called correctly we have to disable jit-gc to ensure that the entrypoint doesn't
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// go away. Furthermore we need to leave this off permanently since one could get the same
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// effect by causing this to be toggled on and off.
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runtime->GetJit()->GetCodeCache()->SetGarbageCollectCode(false);
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}
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// Create Trace object.
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{
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// Required since EnableMethodTracing calls ConfigureStubs which visits class linker classes.
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gc::ScopedGCCriticalSection gcs(self,
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gc::kGcCauseInstrumentation,
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gc::kCollectorTypeInstrumentation);
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ScopedSuspendAll ssa(__FUNCTION__);
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MutexLock mu(self, *Locks::trace_lock_);
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if (the_trace_ != nullptr) {
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LOG(ERROR) << "Trace already in progress, ignoring this request";
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} else {
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enable_stats = (flags & kTraceCountAllocs) != 0;
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the_trace_ = new Trace(trace_file.release(), buffer_size, flags, output_mode, trace_mode);
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if (trace_mode == TraceMode::kSampling) {
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CHECK_PTHREAD_CALL(pthread_create, (&sampling_pthread_, nullptr, &RunSamplingThread,
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reinterpret_cast<void*>(interval_us)),
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"Sampling profiler thread");
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the_trace_->interval_us_ = interval_us;
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} else {
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runtime->GetInstrumentation()->AddListener(the_trace_,
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instrumentation::Instrumentation::kMethodEntered |
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instrumentation::Instrumentation::kMethodExited |
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instrumentation::Instrumentation::kMethodUnwind);
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// TODO: In full-PIC mode, we don't need to fully deopt.
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// TODO: We can only use trampoline entrypoints if we are java-debuggable since in that case
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// we know that inlining and other problematic optimizations are disabled. We might just
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// want to use the trampolines anyway since it is faster. It makes the story with disabling
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// jit-gc more complex though.
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runtime->GetInstrumentation()->EnableMethodTracing(
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kTracerInstrumentationKey, /*needs_interpreter=*/!runtime->IsJavaDebuggable());
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}
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}
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}
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// Can't call this when holding the mutator lock.
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if (enable_stats) {
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runtime->SetStatsEnabled(true);
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}
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}
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void Trace::StopTracing(bool finish_tracing, bool flush_file) {
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bool stop_alloc_counting = false;
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Runtime* const runtime = Runtime::Current();
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Trace* the_trace = nullptr;
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Thread* const self = Thread::Current();
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pthread_t sampling_pthread = 0U;
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{
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MutexLock mu(self, *Locks::trace_lock_);
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if (the_trace_ == nullptr) {
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LOG(ERROR) << "Trace stop requested, but no trace currently running";
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} else {
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the_trace = the_trace_;
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the_trace_ = nullptr;
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sampling_pthread = sampling_pthread_;
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}
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}
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// Make sure that we join before we delete the trace since we don't want to have
|
|
// the sampling thread access a stale pointer. This finishes since the sampling thread exits when
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// the_trace_ is null.
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if (sampling_pthread != 0U) {
|
|
CHECK_PTHREAD_CALL(pthread_join, (sampling_pthread, nullptr), "sampling thread shutdown");
|
|
sampling_pthread_ = 0U;
|
|
}
|
|
|
|
if (the_trace != nullptr) {
|
|
stop_alloc_counting = (the_trace->flags_ & Trace::kTraceCountAllocs) != 0;
|
|
// Stop the trace sources adding more entries to the trace buffer and synchronise stores.
|
|
{
|
|
gc::ScopedGCCriticalSection gcs(self,
|
|
gc::kGcCauseInstrumentation,
|
|
gc::kCollectorTypeInstrumentation);
|
|
ScopedSuspendAll ssa(__FUNCTION__);
|
|
|
|
if (the_trace->trace_mode_ == TraceMode::kSampling) {
|
|
MutexLock mu(self, *Locks::thread_list_lock_);
|
|
runtime->GetThreadList()->ForEach(ClearThreadStackTraceAndClockBase, nullptr);
|
|
} else {
|
|
runtime->GetInstrumentation()->RemoveListener(
|
|
the_trace, instrumentation::Instrumentation::kMethodEntered |
|
|
instrumentation::Instrumentation::kMethodExited |
|
|
instrumentation::Instrumentation::kMethodUnwind);
|
|
runtime->GetInstrumentation()->DisableMethodTracing(kTracerInstrumentationKey);
|
|
}
|
|
}
|
|
// At this point, code may read buf_ as it's writers are shutdown
|
|
// and the ScopedSuspendAll above has ensured all stores to buf_
|
|
// are now visible.
|
|
if (finish_tracing) {
|
|
the_trace->FinishTracing();
|
|
}
|
|
if (the_trace->trace_file_.get() != nullptr) {
|
|
// Do not try to erase, so flush and close explicitly.
|
|
if (flush_file) {
|
|
if (the_trace->trace_file_->Flush() != 0) {
|
|
PLOG(WARNING) << "Could not flush trace file.";
|
|
}
|
|
} else {
|
|
the_trace->trace_file_->MarkUnchecked(); // Do not trigger guard.
|
|
}
|
|
if (the_trace->trace_file_->Close() != 0) {
|
|
PLOG(ERROR) << "Could not close trace file.";
|
|
}
|
|
}
|
|
delete the_trace;
|
|
}
|
|
if (stop_alloc_counting) {
|
|
// Can be racy since SetStatsEnabled is not guarded by any locks.
|
|
runtime->SetStatsEnabled(false);
|
|
}
|
|
}
|
|
|
|
void Trace::Abort() {
|
|
// Do not write anything anymore.
|
|
StopTracing(false, false);
|
|
}
|
|
|
|
void Trace::Stop() {
|
|
// Finish writing.
|
|
StopTracing(true, true);
|
|
}
|
|
|
|
void Trace::Shutdown() {
|
|
if (GetMethodTracingMode() != kTracingInactive) {
|
|
Stop();
|
|
}
|
|
}
|
|
|
|
TracingMode Trace::GetMethodTracingMode() {
|
|
MutexLock mu(Thread::Current(), *Locks::trace_lock_);
|
|
if (the_trace_ == nullptr) {
|
|
return kTracingInactive;
|
|
} else {
|
|
switch (the_trace_->trace_mode_) {
|
|
case TraceMode::kSampling:
|
|
return kSampleProfilingActive;
|
|
case TraceMode::kMethodTracing:
|
|
return kMethodTracingActive;
|
|
}
|
|
LOG(FATAL) << "Unreachable";
|
|
UNREACHABLE();
|
|
}
|
|
}
|
|
|
|
static constexpr size_t kMinBufSize = 18U; // Trace header is up to 18B.
|
|
|
|
Trace::Trace(File* trace_file,
|
|
size_t buffer_size,
|
|
int flags,
|
|
TraceOutputMode output_mode,
|
|
TraceMode trace_mode)
|
|
: trace_file_(trace_file),
|
|
buf_(new uint8_t[std::max(kMinBufSize, buffer_size)]()),
|
|
flags_(flags), trace_output_mode_(output_mode), trace_mode_(trace_mode),
|
|
clock_source_(default_clock_source_),
|
|
buffer_size_(std::max(kMinBufSize, buffer_size)),
|
|
start_time_(MicroTime()), clock_overhead_ns_(GetClockOverheadNanoSeconds()),
|
|
overflow_(false), interval_us_(0), streaming_lock_(nullptr),
|
|
unique_methods_lock_(new Mutex("unique methods lock", kTracingUniqueMethodsLock)) {
|
|
CHECK(trace_file != nullptr || output_mode == TraceOutputMode::kDDMS);
|
|
|
|
uint16_t trace_version = GetTraceVersion(clock_source_);
|
|
if (output_mode == TraceOutputMode::kStreaming) {
|
|
trace_version |= 0xF0U;
|
|
}
|
|
// Set up the beginning of the trace.
|
|
memset(buf_.get(), 0, kTraceHeaderLength);
|
|
Append4LE(buf_.get(), kTraceMagicValue);
|
|
Append2LE(buf_.get() + 4, trace_version);
|
|
Append2LE(buf_.get() + 6, kTraceHeaderLength);
|
|
Append8LE(buf_.get() + 8, start_time_);
|
|
if (trace_version >= kTraceVersionDualClock) {
|
|
uint16_t record_size = GetRecordSize(clock_source_);
|
|
Append2LE(buf_.get() + 16, record_size);
|
|
}
|
|
static_assert(18 <= kMinBufSize, "Minimum buffer size not large enough for trace header");
|
|
|
|
cur_offset_.store(kTraceHeaderLength, std::memory_order_relaxed);
|
|
|
|
if (output_mode == TraceOutputMode::kStreaming) {
|
|
streaming_lock_ = new Mutex("tracing lock", LockLevel::kTracingStreamingLock);
|
|
seen_threads_.reset(new ThreadIDBitSet());
|
|
}
|
|
}
|
|
|
|
Trace::~Trace() {
|
|
delete streaming_lock_;
|
|
delete unique_methods_lock_;
|
|
}
|
|
|
|
static uint64_t ReadBytes(uint8_t* buf, size_t bytes) {
|
|
uint64_t ret = 0;
|
|
for (size_t i = 0; i < bytes; ++i) {
|
|
ret |= static_cast<uint64_t>(buf[i]) << (i * 8);
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
void Trace::DumpBuf(uint8_t* buf, size_t buf_size, TraceClockSource clock_source) {
|
|
uint8_t* ptr = buf + kTraceHeaderLength;
|
|
uint8_t* end = buf + buf_size;
|
|
|
|
while (ptr < end) {
|
|
uint32_t tmid = ReadBytes(ptr + 2, sizeof(tmid));
|
|
ArtMethod* method = DecodeTraceMethod(tmid);
|
|
TraceAction action = DecodeTraceAction(tmid);
|
|
LOG(INFO) << ArtMethod::PrettyMethod(method) << " " << static_cast<int>(action);
|
|
ptr += GetRecordSize(clock_source);
|
|
}
|
|
}
|
|
|
|
void Trace::FinishTracing() {
|
|
size_t final_offset = 0;
|
|
std::set<ArtMethod*> visited_methods;
|
|
if (trace_output_mode_ == TraceOutputMode::kStreaming) {
|
|
// Clean up.
|
|
MutexLock mu(Thread::Current(), *streaming_lock_);
|
|
STLDeleteValues(&seen_methods_);
|
|
} else {
|
|
final_offset = cur_offset_.load(std::memory_order_relaxed);
|
|
GetVisitedMethods(final_offset, &visited_methods);
|
|
}
|
|
|
|
// Compute elapsed time.
|
|
uint64_t elapsed = MicroTime() - start_time_;
|
|
|
|
std::ostringstream os;
|
|
|
|
os << StringPrintf("%cversion\n", kTraceTokenChar);
|
|
os << StringPrintf("%d\n", GetTraceVersion(clock_source_));
|
|
os << StringPrintf("data-file-overflow=%s\n", overflow_ ? "true" : "false");
|
|
if (UseThreadCpuClock()) {
|
|
if (UseWallClock()) {
|
|
os << StringPrintf("clock=dual\n");
|
|
} else {
|
|
os << StringPrintf("clock=thread-cpu\n");
|
|
}
|
|
} else {
|
|
os << StringPrintf("clock=wall\n");
|
|
}
|
|
os << StringPrintf("elapsed-time-usec=%" PRIu64 "\n", elapsed);
|
|
if (trace_output_mode_ != TraceOutputMode::kStreaming) {
|
|
size_t num_records = (final_offset - kTraceHeaderLength) / GetRecordSize(clock_source_);
|
|
os << StringPrintf("num-method-calls=%zd\n", num_records);
|
|
}
|
|
os << StringPrintf("clock-call-overhead-nsec=%d\n", clock_overhead_ns_);
|
|
os << StringPrintf("vm=art\n");
|
|
os << StringPrintf("pid=%d\n", getpid());
|
|
if ((flags_ & kTraceCountAllocs) != 0) {
|
|
os << "alloc-count=" << Runtime::Current()->GetStat(KIND_ALLOCATED_OBJECTS) << "\n";
|
|
os << "alloc-size=" << Runtime::Current()->GetStat(KIND_ALLOCATED_BYTES) << "\n";
|
|
os << "gc-count=" << Runtime::Current()->GetStat(KIND_GC_INVOCATIONS) << "\n";
|
|
}
|
|
os << StringPrintf("%cthreads\n", kTraceTokenChar);
|
|
DumpThreadList(os);
|
|
os << StringPrintf("%cmethods\n", kTraceTokenChar);
|
|
DumpMethodList(os, visited_methods);
|
|
os << StringPrintf("%cend\n", kTraceTokenChar);
|
|
std::string header(os.str());
|
|
|
|
if (trace_output_mode_ == TraceOutputMode::kStreaming) {
|
|
// Protect access to buf_ and satisfy sanitizer for calls to WriteBuf / FlushBuf.
|
|
MutexLock mu(Thread::Current(), *streaming_lock_);
|
|
// Write a special token to mark the end of trace records and the start of
|
|
// trace summary.
|
|
uint8_t buf[7];
|
|
Append2LE(buf, 0);
|
|
buf[2] = kOpTraceSummary;
|
|
Append4LE(buf + 3, static_cast<uint32_t>(header.length()));
|
|
WriteToBuf(buf, sizeof(buf));
|
|
// Write the trace summary. The summary is identical to the file header when
|
|
// the output mode is not streaming (except for methods).
|
|
WriteToBuf(reinterpret_cast<const uint8_t*>(header.c_str()), header.length());
|
|
// Flush the buffer, which may include some trace records before the summary.
|
|
FlushBuf();
|
|
} else {
|
|
if (trace_file_.get() == nullptr) {
|
|
std::vector<uint8_t> data;
|
|
data.resize(header.length() + final_offset);
|
|
memcpy(data.data(), header.c_str(), header.length());
|
|
memcpy(data.data() + header.length(), buf_.get(), final_offset);
|
|
Runtime::Current()->GetRuntimeCallbacks()->DdmPublishChunk(CHUNK_TYPE("MPSE"),
|
|
ArrayRef<const uint8_t>(data));
|
|
const bool kDumpTraceInfo = false;
|
|
if (kDumpTraceInfo) {
|
|
LOG(INFO) << "Trace sent:\n" << header;
|
|
DumpBuf(buf_.get(), final_offset, clock_source_);
|
|
}
|
|
} else {
|
|
if (!trace_file_->WriteFully(header.c_str(), header.length()) ||
|
|
!trace_file_->WriteFully(buf_.get(), final_offset)) {
|
|
std::string detail(StringPrintf("Trace data write failed: %s", strerror(errno)));
|
|
PLOG(ERROR) << detail;
|
|
ThrowRuntimeException("%s", detail.c_str());
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
void Trace::DexPcMoved(Thread* thread ATTRIBUTE_UNUSED,
|
|
Handle<mirror::Object> this_object ATTRIBUTE_UNUSED,
|
|
ArtMethod* method,
|
|
uint32_t new_dex_pc) {
|
|
// We're not recorded to listen to this kind of event, so complain.
|
|
LOG(ERROR) << "Unexpected dex PC event in tracing " << ArtMethod::PrettyMethod(method)
|
|
<< " " << new_dex_pc;
|
|
}
|
|
|
|
void Trace::FieldRead(Thread* thread ATTRIBUTE_UNUSED,
|
|
Handle<mirror::Object> this_object ATTRIBUTE_UNUSED,
|
|
ArtMethod* method,
|
|
uint32_t dex_pc,
|
|
ArtField* field ATTRIBUTE_UNUSED)
|
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
|
// We're not recorded to listen to this kind of event, so complain.
|
|
LOG(ERROR) << "Unexpected field read event in tracing " << ArtMethod::PrettyMethod(method)
|
|
<< " " << dex_pc;
|
|
}
|
|
|
|
void Trace::FieldWritten(Thread* thread ATTRIBUTE_UNUSED,
|
|
Handle<mirror::Object> this_object ATTRIBUTE_UNUSED,
|
|
ArtMethod* method,
|
|
uint32_t dex_pc,
|
|
ArtField* field ATTRIBUTE_UNUSED,
|
|
const JValue& field_value ATTRIBUTE_UNUSED)
|
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
|
// We're not recorded to listen to this kind of event, so complain.
|
|
LOG(ERROR) << "Unexpected field write event in tracing " << ArtMethod::PrettyMethod(method)
|
|
<< " " << dex_pc;
|
|
}
|
|
|
|
void Trace::MethodEntered(Thread* thread,
|
|
Handle<mirror::Object> this_object ATTRIBUTE_UNUSED,
|
|
ArtMethod* method,
|
|
uint32_t dex_pc ATTRIBUTE_UNUSED) {
|
|
uint32_t thread_clock_diff = 0;
|
|
uint32_t wall_clock_diff = 0;
|
|
ReadClocks(thread, &thread_clock_diff, &wall_clock_diff);
|
|
LogMethodTraceEvent(thread, method, instrumentation::Instrumentation::kMethodEntered,
|
|
thread_clock_diff, wall_clock_diff);
|
|
}
|
|
|
|
void Trace::MethodExited(Thread* thread,
|
|
Handle<mirror::Object> this_object ATTRIBUTE_UNUSED,
|
|
ArtMethod* method,
|
|
uint32_t dex_pc ATTRIBUTE_UNUSED,
|
|
instrumentation::OptionalFrame frame ATTRIBUTE_UNUSED,
|
|
JValue& return_value ATTRIBUTE_UNUSED) {
|
|
uint32_t thread_clock_diff = 0;
|
|
uint32_t wall_clock_diff = 0;
|
|
ReadClocks(thread, &thread_clock_diff, &wall_clock_diff);
|
|
LogMethodTraceEvent(thread,
|
|
method,
|
|
instrumentation::Instrumentation::kMethodExited,
|
|
thread_clock_diff,
|
|
wall_clock_diff);
|
|
}
|
|
|
|
void Trace::MethodUnwind(Thread* thread,
|
|
Handle<mirror::Object> this_object ATTRIBUTE_UNUSED,
|
|
ArtMethod* method,
|
|
uint32_t dex_pc ATTRIBUTE_UNUSED) {
|
|
uint32_t thread_clock_diff = 0;
|
|
uint32_t wall_clock_diff = 0;
|
|
ReadClocks(thread, &thread_clock_diff, &wall_clock_diff);
|
|
LogMethodTraceEvent(thread, method, instrumentation::Instrumentation::kMethodUnwind,
|
|
thread_clock_diff, wall_clock_diff);
|
|
}
|
|
|
|
void Trace::ExceptionThrown(Thread* thread ATTRIBUTE_UNUSED,
|
|
Handle<mirror::Throwable> exception_object ATTRIBUTE_UNUSED)
|
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
|
LOG(ERROR) << "Unexpected exception thrown event in tracing";
|
|
}
|
|
|
|
void Trace::ExceptionHandled(Thread* thread ATTRIBUTE_UNUSED,
|
|
Handle<mirror::Throwable> exception_object ATTRIBUTE_UNUSED)
|
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
|
LOG(ERROR) << "Unexpected exception thrown event in tracing";
|
|
}
|
|
|
|
void Trace::Branch(Thread* /*thread*/, ArtMethod* method,
|
|
uint32_t /*dex_pc*/, int32_t /*dex_pc_offset*/)
|
|
REQUIRES_SHARED(Locks::mutator_lock_) {
|
|
LOG(ERROR) << "Unexpected branch event in tracing" << ArtMethod::PrettyMethod(method);
|
|
}
|
|
|
|
void Trace::WatchedFramePop(Thread* self ATTRIBUTE_UNUSED,
|
|
const ShadowFrame& frame ATTRIBUTE_UNUSED) {
|
|
LOG(ERROR) << "Unexpected WatchedFramePop event in tracing";
|
|
}
|
|
|
|
void Trace::ReadClocks(Thread* thread, uint32_t* thread_clock_diff, uint32_t* wall_clock_diff) {
|
|
if (UseThreadCpuClock()) {
|
|
uint64_t clock_base = thread->GetTraceClockBase();
|
|
if (UNLIKELY(clock_base == 0)) {
|
|
// First event, record the base time in the map.
|
|
uint64_t time = thread->GetCpuMicroTime();
|
|
thread->SetTraceClockBase(time);
|
|
} else {
|
|
*thread_clock_diff = thread->GetCpuMicroTime() - clock_base;
|
|
}
|
|
}
|
|
if (UseWallClock()) {
|
|
*wall_clock_diff = MicroTime() - start_time_;
|
|
}
|
|
}
|
|
|
|
bool Trace::RegisterMethod(ArtMethod* method) {
|
|
const DexFile* dex_file = method->GetDexFile();
|
|
if (seen_methods_.find(dex_file) == seen_methods_.end()) {
|
|
seen_methods_.insert(std::make_pair(dex_file, new DexIndexBitSet()));
|
|
}
|
|
DexIndexBitSet* bit_set = seen_methods_.find(dex_file)->second;
|
|
if (!(*bit_set)[method->GetDexMethodIndex()]) {
|
|
bit_set->set(method->GetDexMethodIndex());
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
bool Trace::RegisterThread(Thread* thread) {
|
|
pid_t tid = thread->GetTid();
|
|
CHECK_LT(0U, static_cast<uint32_t>(tid));
|
|
CHECK_LT(static_cast<uint32_t>(tid), kMaxThreadIdNumber);
|
|
|
|
if (!(*seen_threads_)[tid]) {
|
|
seen_threads_->set(tid);
|
|
return true;
|
|
}
|
|
return false;
|
|
}
|
|
|
|
std::string Trace::GetMethodLine(ArtMethod* method) {
|
|
method = method->GetInterfaceMethodIfProxy(kRuntimePointerSize);
|
|
return StringPrintf("%#x\t%s\t%s\t%s\t%s\n", (EncodeTraceMethod(method) << TraceActionBits),
|
|
PrettyDescriptor(method->GetDeclaringClassDescriptor()).c_str(), method->GetName(),
|
|
method->GetSignature().ToString().c_str(), method->GetDeclaringClassSourceFile());
|
|
}
|
|
|
|
void Trace::WriteToBuf(const uint8_t* src, size_t src_size) {
|
|
// Updates to cur_offset_ are done under the streaming_lock_ here as in streaming mode.
|
|
int32_t old_offset = cur_offset_.load(std::memory_order_relaxed);
|
|
int32_t new_offset = old_offset + static_cast<int32_t>(src_size);
|
|
if (dchecked_integral_cast<size_t>(new_offset) > buffer_size_) {
|
|
// Flush buffer.
|
|
if (!trace_file_->WriteFully(buf_.get(), old_offset)) {
|
|
PLOG(WARNING) << "Failed streaming a tracing event.";
|
|
}
|
|
|
|
// Check whether the data is too large for the buffer, then write immediately.
|
|
if (src_size >= buffer_size_) {
|
|
if (!trace_file_->WriteFully(src, src_size)) {
|
|
PLOG(WARNING) << "Failed streaming a tracing event.";
|
|
}
|
|
cur_offset_.store(0, std::memory_order_relaxed); // Buffer is empty now.
|
|
return;
|
|
}
|
|
|
|
old_offset = 0;
|
|
new_offset = static_cast<int32_t>(src_size);
|
|
}
|
|
cur_offset_.store(new_offset, std::memory_order_relaxed);
|
|
// Fill in data.
|
|
memcpy(buf_.get() + old_offset, src, src_size);
|
|
}
|
|
|
|
void Trace::FlushBuf() {
|
|
// Updates to cur_offset_ are done under the streaming_lock_ here as in streaming mode.
|
|
int32_t offset = cur_offset_.load(std::memory_order_relaxed);
|
|
if (!trace_file_->WriteFully(buf_.get(), offset)) {
|
|
PLOG(WARNING) << "Failed flush the remaining data in streaming.";
|
|
}
|
|
cur_offset_.store(0, std::memory_order_relaxed);
|
|
}
|
|
|
|
void Trace::LogMethodTraceEvent(Thread* thread, ArtMethod* method,
|
|
instrumentation::Instrumentation::InstrumentationEvent event,
|
|
uint32_t thread_clock_diff, uint32_t wall_clock_diff) {
|
|
// This method is called in both tracing modes (method and
|
|
// sampling). In sampling mode, this method is only called by the
|
|
// sampling thread. In method tracing mode, it can be called
|
|
// concurrently.
|
|
|
|
// Ensure we always use the non-obsolete version of the method so that entry/exit events have the
|
|
// same pointer value.
|
|
method = method->GetNonObsoleteMethod();
|
|
|
|
// Advance cur_offset_ atomically.
|
|
int32_t new_offset;
|
|
int32_t old_offset = 0;
|
|
|
|
// In the non-streaming case, we do a busy loop here trying to get
|
|
// an offset to write our record and advance cur_offset_ for the
|
|
// next use.
|
|
if (trace_output_mode_ != TraceOutputMode::kStreaming) {
|
|
// Although multiple threads can call this method concurrently,
|
|
// the compare_exchange_weak here is still atomic (by definition).
|
|
// A succeeding update is visible to other cores when they pass
|
|
// through this point.
|
|
old_offset = cur_offset_.load(std::memory_order_relaxed); // Speculative read
|
|
do {
|
|
new_offset = old_offset + GetRecordSize(clock_source_);
|
|
if (static_cast<size_t>(new_offset) > buffer_size_) {
|
|
overflow_ = true;
|
|
return;
|
|
}
|
|
} while (!cur_offset_.compare_exchange_weak(old_offset, new_offset, std::memory_order_relaxed));
|
|
}
|
|
|
|
TraceAction action = kTraceMethodEnter;
|
|
switch (event) {
|
|
case instrumentation::Instrumentation::kMethodEntered:
|
|
action = kTraceMethodEnter;
|
|
break;
|
|
case instrumentation::Instrumentation::kMethodExited:
|
|
action = kTraceMethodExit;
|
|
break;
|
|
case instrumentation::Instrumentation::kMethodUnwind:
|
|
action = kTraceUnroll;
|
|
break;
|
|
default:
|
|
UNIMPLEMENTED(FATAL) << "Unexpected event: " << event;
|
|
}
|
|
|
|
uint32_t method_value = EncodeTraceMethodAndAction(method, action);
|
|
|
|
// Write data into the tracing buffer (if not streaming) or into a
|
|
// small buffer on the stack (if streaming) which we'll put into the
|
|
// tracing buffer below.
|
|
//
|
|
// These writes to the tracing buffer are synchronised with the
|
|
// future reads that (only) occur under FinishTracing(). The callers
|
|
// of FinishTracing() acquire locks and (implicitly) synchronise
|
|
// the buffer memory.
|
|
uint8_t* ptr;
|
|
static constexpr size_t kPacketSize = 14U; // The maximum size of data in a packet.
|
|
uint8_t stack_buf[kPacketSize]; // Space to store a packet when in streaming mode.
|
|
if (trace_output_mode_ == TraceOutputMode::kStreaming) {
|
|
ptr = stack_buf;
|
|
} else {
|
|
ptr = buf_.get() + old_offset;
|
|
}
|
|
|
|
Append2LE(ptr, thread->GetTid());
|
|
Append4LE(ptr + 2, method_value);
|
|
ptr += 6;
|
|
|
|
if (UseThreadCpuClock()) {
|
|
Append4LE(ptr, thread_clock_diff);
|
|
ptr += 4;
|
|
}
|
|
if (UseWallClock()) {
|
|
Append4LE(ptr, wall_clock_diff);
|
|
}
|
|
static_assert(kPacketSize == 2 + 4 + 4 + 4, "Packet size incorrect.");
|
|
|
|
if (trace_output_mode_ == TraceOutputMode::kStreaming) {
|
|
MutexLock mu(Thread::Current(), *streaming_lock_); // To serialize writing.
|
|
if (RegisterMethod(method)) {
|
|
// Write a special block with the name.
|
|
std::string method_line(GetMethodLine(method));
|
|
uint8_t buf2[5];
|
|
Append2LE(buf2, 0);
|
|
buf2[2] = kOpNewMethod;
|
|
Append2LE(buf2 + 3, static_cast<uint16_t>(method_line.length()));
|
|
WriteToBuf(buf2, sizeof(buf2));
|
|
WriteToBuf(reinterpret_cast<const uint8_t*>(method_line.c_str()), method_line.length());
|
|
}
|
|
if (RegisterThread(thread)) {
|
|
// It might be better to postpone this. Threads might not have received names...
|
|
std::string thread_name;
|
|
thread->GetThreadName(thread_name);
|
|
uint8_t buf2[7];
|
|
Append2LE(buf2, 0);
|
|
buf2[2] = kOpNewThread;
|
|
Append2LE(buf2 + 3, static_cast<uint16_t>(thread->GetTid()));
|
|
Append2LE(buf2 + 5, static_cast<uint16_t>(thread_name.length()));
|
|
WriteToBuf(buf2, sizeof(buf2));
|
|
WriteToBuf(reinterpret_cast<const uint8_t*>(thread_name.c_str()), thread_name.length());
|
|
}
|
|
WriteToBuf(stack_buf, sizeof(stack_buf));
|
|
}
|
|
}
|
|
|
|
void Trace::GetVisitedMethods(size_t buf_size,
|
|
std::set<ArtMethod*>* visited_methods) {
|
|
uint8_t* ptr = buf_.get() + kTraceHeaderLength;
|
|
uint8_t* end = buf_.get() + buf_size;
|
|
|
|
while (ptr < end) {
|
|
uint32_t tmid = ReadBytes(ptr + 2, sizeof(tmid));
|
|
ArtMethod* method = DecodeTraceMethod(tmid);
|
|
visited_methods->insert(method);
|
|
ptr += GetRecordSize(clock_source_);
|
|
}
|
|
}
|
|
|
|
void Trace::DumpMethodList(std::ostream& os, const std::set<ArtMethod*>& visited_methods) {
|
|
for (const auto& method : visited_methods) {
|
|
os << GetMethodLine(method);
|
|
}
|
|
}
|
|
|
|
static void DumpThread(Thread* t, void* arg) {
|
|
std::ostream& os = *reinterpret_cast<std::ostream*>(arg);
|
|
std::string name;
|
|
t->GetThreadName(name);
|
|
os << t->GetTid() << "\t" << name << "\n";
|
|
}
|
|
|
|
void Trace::DumpThreadList(std::ostream& os) {
|
|
Thread* self = Thread::Current();
|
|
for (const auto& it : exited_threads_) {
|
|
os << it.first << "\t" << it.second << "\n";
|
|
}
|
|
Locks::thread_list_lock_->AssertNotHeld(self);
|
|
MutexLock mu(self, *Locks::thread_list_lock_);
|
|
Runtime::Current()->GetThreadList()->ForEach(DumpThread, &os);
|
|
}
|
|
|
|
void Trace::StoreExitingThreadInfo(Thread* thread) {
|
|
MutexLock mu(thread, *Locks::trace_lock_);
|
|
if (the_trace_ != nullptr) {
|
|
std::string name;
|
|
thread->GetThreadName(name);
|
|
// The same thread/tid may be used multiple times. As SafeMap::Put does not allow to override
|
|
// a previous mapping, use SafeMap::Overwrite.
|
|
the_trace_->exited_threads_.Overwrite(thread->GetTid(), name);
|
|
}
|
|
}
|
|
|
|
Trace::TraceOutputMode Trace::GetOutputMode() {
|
|
MutexLock mu(Thread::Current(), *Locks::trace_lock_);
|
|
CHECK(the_trace_ != nullptr) << "Trace output mode requested, but no trace currently running";
|
|
return the_trace_->trace_output_mode_;
|
|
}
|
|
|
|
Trace::TraceMode Trace::GetMode() {
|
|
MutexLock mu(Thread::Current(), *Locks::trace_lock_);
|
|
CHECK(the_trace_ != nullptr) << "Trace mode requested, but no trace currently running";
|
|
return the_trace_->trace_mode_;
|
|
}
|
|
|
|
size_t Trace::GetBufferSize() {
|
|
MutexLock mu(Thread::Current(), *Locks::trace_lock_);
|
|
CHECK(the_trace_ != nullptr) << "Trace mode requested, but no trace currently running";
|
|
return the_trace_->buffer_size_;
|
|
}
|
|
|
|
bool Trace::IsTracingEnabled() {
|
|
MutexLock mu(Thread::Current(), *Locks::trace_lock_);
|
|
return the_trace_ != nullptr;
|
|
}
|
|
|
|
} // namespace art
|