Introduce gpu_trace_event for gpu performance analysis.

gpu/common/gpu_trace_event.cc

Index: gpu/common/gpu_trace_event.cc
diff --git a/gpu/common/gpu_trace_event.cc b/gpu/common/gpu_trace_event.cc
new file mode 100644
index 0000000000000000000000000000000000000000..d9caec35db19df75671640cbee876ec490e9e722
--- /dev/null
+++ b/gpu/common/gpu_trace_event.cc
@@ -0,0 +1,216 @@
+// Copyright (c) 2010 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "gpu/common/gpu_trace_event.h"
+
+#include "base/format_macros.h"
+#include "base/process_util.h"
+#include "base/stringprintf.h"
+#include "base/utf_string_conversions.h"
+#include "base/time.h"
+
+#define USE_UNRELIABLE_NOW
+
+using namespace base;
+
+namespace gpu {
+
+// Controls the number of trace events we will buffer in-memory
+// before flushing them.
+#define TRACE_EVENT_BUFFER_SIZE 16384
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// TraceLog::Category
+//
+////////////////////////////////////////////////////////////////////////////////
+TraceCategory::TraceCategory(const char* name, bool enabled)
+    : name_(name) {
+  base::subtle::NoBarrier_Store(&enabled_,
+      static_cast<base::subtle::Atomic32>(enabled));
+}
+
+TraceCategory::~TraceCategory() {
+  base::subtle::NoBarrier_Store(&enabled_,
+      static_cast<base::subtle::Atomic32>(0));
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// TraceEvent
+//
+////////////////////////////////////////////////////////////////////////////////
+
+namespace {
+const char* GetPhaseStr(TraceEventPhase phase) {
+  if (phase == GPU_TRACE_EVENT_PHASE_BEGIN) {
+    return "B";
+  } else if (phase == GPU_TRACE_EVENT_PHASE_INSTANT) {
+    return "I";
+  } else if (phase == GPU_TRACE_EVENT_PHASE_END) {
+    return "E";
+  } else {
+    DCHECK(false);
+    return "?";
+  }
+}
+}
+
+void TraceEvent::AppendAsJSON(std::string* out,
+    const std::vector<TraceEvent>& events) {
+  *out += "[";
+  for (size_t i = 0; i < events.size(); ++i) {
+    if (i > 0)
+      *out += ",";
+    events[i].AppendAsJSON(out);
+  }
+  *out += "]";
+}
+
+void TraceEvent::AppendAsJSON(std::string* out) const {
+  int nargs = 0;
+  for (int i = 0; i < TRACE_MAX_NUM_ARGS; ++i) {
+    if (argNames[i] == NULL)
+      break;
+    nargs += 1;
+  }
+
+  const char* phaseStr = GetPhaseStr(phase);
+  int64 time_int64 = timestamp.ToInternalValue();
+  long long unsigned int time_llui =
+      static_cast<long long unsigned int>(time_int64);
+  StringAppendF(out,
+      "{cat:'%s',pid:%i,tid:%i,ts:0x%llx,ph:'%s',name:'%s',args:{",
+      category->name(),
+      static_cast<int>(processId),
+      static_cast<int>(threadId),
+      time_llui,
+      phaseStr,
+      name);
+  for (int  i = 0; i < nargs; ++i) {
+    if (i > 0)
+      *out += ",";
+    *out += argNames[i];
+    *out += ":'";
+    *out += argValues[i];
+    *out += "'";
+  }
+  *out += "}}";
+}
+
+////////////////////////////////////////////////////////////////////////////////
+//
+// TraceLog
+//
+////////////////////////////////////////////////////////////////////////////////
+
+// static
+TraceLog* TraceLog::GetInstance() {
+  return Singleton<TraceLog, StaticMemorySingletonTraits<TraceLog> >::get();
+}
+
+TraceLog::TraceLog()
+    : enabled_(false)
+{
+  logged_events_.reserve(1024);
+}
+
+TraceLog::~TraceLog() {
+}
+
+TraceCategory* TraceLog::GetCategory(const char* name) {
+  AutoLock lock(lock_);
+  // TODO(nduca): replace with a hash_map.
+  for (int i = categories_.size() - 1; i >= 0; i-- ) {
+    if (strcmp(categories_[i]->name(), name) == 0)
+      return categories_[i];
+  }
+  TraceCategory* category = new TraceCategory(name, enabled_);
+  categories_.push_back(category);
+  return category;
+}
+
+void TraceLog::SetEnabled(bool enabled) {
+  AutoLock lock(lock_);
+  if (enabled == enabled_)
+    return;
+  if (enabled) {
+    // Enable all categories.
+    enabled_ = true;
+    for (size_t i = 0; i < categories_.size(); i++) {
+      base::subtle::NoBarrier_Store(&categories_[i]->enabled_,
+                                    static_cast<base::subtle::Atomic32>(1));
+    }
+  } else {
+    // Disable all categories.
+    for (size_t i = 0; i < categories_.size(); i++) {
+      base::subtle::NoBarrier_Store(&categories_[i]->enabled_,
+                                    static_cast<base::subtle::Atomic32>(0));
+    }
+    enabled_ = false;
+    FlushWithLockAlreadyHeld();
+  }
+}
+
+void TraceLog::SetOutputCallback(TraceLog::OutputCallback* cb) {
+  AutoLock lock(lock_);
+  if (enabled_) {
+    FlushWithLockAlreadyHeld();
+  }
+  output_callback_.reset(cb);
+}
+
+void TraceLog::AddRemotelyCollectedData(const std::string& json_events) {
+  AutoLock lock(lock_);
+  if (output_callback_.get())
+    output_callback_->Run(json_events);
+}
+
+void TraceLog::Flush() {
+  AutoLock lock(lock_);
+  FlushWithLockAlreadyHeld();
+}
+
+void TraceLog::FlushWithLockAlreadyHeld() {
+  if (output_callback_.get() && logged_events_.size()) {
+    std::string json_events;
+    TraceEvent::AppendAsJSON(&json_events, logged_events_);
+    output_callback_->Run(json_events);
+  }
+  logged_events_.erase(logged_events_.begin(), logged_events_.end());
+}
+
+void TraceLog::AddTraceEvent(TraceEventPhase phase,
+    const char* file, int line,
+    TraceCategory* category,
+    const char* name,
+    const char* arg1name, const char* arg1val,
+    const char* arg2name, const char* arg2val) {
+  DCHECK(file && name);
+#ifdef USE_UNRELIABLE_NOW
+  TimeTicks now = TimeTicks::HighResNow();
+#else
+  TimeTicks now = TimeTicks::Now();
+#endif
+  //static_cast<unsigned long>(base::GetCurrentProcId()),
+  AutoLock lock(lock_);
+  logged_events_.push_back(TraceEvent());
+  TraceEvent& event = logged_events_.back();
+  event.processId = static_cast<unsigned long>(base::GetCurrentProcId());
+  event.threadId = PlatformThread::CurrentId();
+  event.timestamp = now;
+  event.phase = phase;
+  event.category = category;
+  event.name = name;
+  event.argNames[0] = arg1name;
+  event.argValues[0] = arg1name ? arg1val : "";
+  event.argNames[1] = arg2name;
+  event.argValues[1] = arg2name ? arg2val : "";
+  COMPILE_ASSERT(TRACE_MAX_NUM_ARGS == 2, TraceEvent_arc_count_out_of_sync);
+
+  if (logged_events_.size() > TRACE_EVENT_BUFFER_SIZE)
+    FlushWithLockAlreadyHeld();
+}
+
+}  // namespace gpu