runtime-profiler.h revision b0fe1620dcb4135ac3ab2d66ff93072373911299 
1// Copyright 2010 the V8 project authors. All rights reserved.
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27
28#ifndef V8_RUNTIME_PROFILER_H_
29#define V8_RUNTIME_PROFILER_H_
30
31#include "v8.h"
32#include "allocation.h"
33
34namespace v8 {
35namespace internal {
36
37class RuntimeProfiler : public AllStatic {
38 public:
39  static bool IsEnabled() { return V8::UseCrankshaft() && FLAG_opt; }
40
41  static void OptimizeNow();
42  static void OptimizeSoon(JSFunction* function);
43
44  static void NotifyTick();
45
46  static void Setup();
47  static void Reset();
48  static void TearDown();
49
50  static void MarkCompactPrologue(bool is_compacting);
51  static Object** SamplerWindowAddress();
52  static int SamplerWindowSize();
53};
54
55
56// Rate limiter intended to be used in the profiler thread.
57class RuntimeProfilerRateLimiter BASE_EMBEDDED {
58 public:
59  RuntimeProfilerRateLimiter() : non_js_ticks_(0) { }
60
61  // Suspends the current thread when not executing JavaScript to
62  // minimize CPU usage. Returns whether this thread was suspended
63  // (and so might have to check whether profiling is still active.)
64  //
65  // Does nothing when runtime profiling is not enabled.
66  bool SuspendIfNecessary();
67
68 private:
69  int non_js_ticks_;
70
71  DISALLOW_COPY_AND_ASSIGN(RuntimeProfilerRateLimiter);
72};
73
74} }  // namespace v8::internal
75
76#endif  // V8_RUNTIME_PROFILER_H_
77