/* * Copyright (C) 2015 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * * http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */ #ifndef ART_RUNTIME_JIT_PROFILE_SAVER_H_ #define ART_RUNTIME_JIT_PROFILE_SAVER_H_ #include "base/mutex.h" #include "jit_code_cache.h" #include "profile_compilation_info.h" #include "profile_saver_options.h" #include "safe_map.h" namespace art { class ProfileSaver { public: // Starts the profile saver thread if not already started. // If the saver is already running it adds (output_filename, code_paths) to its tracked locations. static void Start(const ProfileSaverOptions& options, const std::string& output_filename, jit::JitCodeCache* jit_code_cache, const std::vector& code_paths) REQUIRES(!Locks::profiler_lock_, !wait_lock_); // Stops the profile saver thread. // NO_THREAD_SAFETY_ANALYSIS for static function calling into member function with excludes lock. static void Stop(bool dump_info_) REQUIRES(!Locks::profiler_lock_, !wait_lock_) NO_THREAD_SAFETY_ANALYSIS; // Returns true if the profile saver is started. static bool IsStarted() REQUIRES(!Locks::profiler_lock_); // If the profile saver is running, dumps statistics to the `os`. Otherwise it does nothing. static void DumpInstanceInfo(std::ostream& os); // NO_THREAD_SAFETY_ANALYSIS for static function calling into member function with excludes lock. static void NotifyJitActivity() REQUIRES(!Locks::profiler_lock_, !wait_lock_) NO_THREAD_SAFETY_ANALYSIS; // For testing or manual purposes (SIGUSR1). static void ForceProcessProfiles(); // Just for testing purpose. static bool HasSeenMethod(const std::string& profile, const DexFile* dex_file, uint16_t method_idx); private: ProfileSaver(const ProfileSaverOptions& options, const std::string& output_filename, jit::JitCodeCache* jit_code_cache, const std::vector& code_paths); ~ProfileSaver(); // NO_THREAD_SAFETY_ANALYSIS for static function calling into member function with excludes lock. static void* RunProfileSaverThread(void* arg) REQUIRES(!Locks::profiler_lock_, !wait_lock_) NO_THREAD_SAFETY_ANALYSIS; // The run loop for the saver. void Run() REQUIRES(!Locks::profiler_lock_, !wait_lock_); // Processes the existing profiling info from the jit code cache and returns // true if it needed to be saved to disk. // If number_of_new_methods is not null, after the call it will contain the number of new methods // written to disk. // If force_save is true, the saver will ignore any constraints which limit IO (e.g. will write // the profile to disk even if it's just one new method). bool ProcessProfilingInfo(bool force_save, /*out*/uint16_t* number_of_new_methods) REQUIRES(!Locks::profiler_lock_) REQUIRES(!Locks::mutator_lock_); void NotifyJitActivityInternal() REQUIRES(!wait_lock_); void WakeUpSaver() REQUIRES(wait_lock_); // Returns true if the saver is shutting down (ProfileSaver::Stop() has been called). bool ShuttingDown(Thread* self) REQUIRES(!Locks::profiler_lock_); void AddTrackedLocations(const std::string& output_filename, const std::vector& code_paths) REQUIRES(Locks::profiler_lock_); // Fetches the current resolved classes and methods from the ClassLinker and stores them in the // profile_cache_ for later save. void FetchAndCacheResolvedClassesAndMethods(); void DumpInfo(std::ostream& os); // Resolve the realpath of the locations stored in tracked_dex_base_locations_to_be_resolved_ // and put the result in tracked_dex_base_locations_. void ResolveTrackedLocations() REQUIRES(!Locks::profiler_lock_); // The only instance of the saver. static ProfileSaver* instance_ GUARDED_BY(Locks::profiler_lock_); // Profile saver thread. static pthread_t profiler_pthread_ GUARDED_BY(Locks::profiler_lock_); jit::JitCodeCache* jit_code_cache_; // Collection of code paths that the profiler tracks. // It maps profile locations to code paths (dex base locations). SafeMap> tracked_dex_base_locations_ GUARDED_BY(Locks::profiler_lock_); // Collection of code paths that the profiler tracks but may note have been resolved // to their realpath. The resolution is done async to minimize the time it takes for // someone to register a path. SafeMap> tracked_dex_base_locations_to_be_resolved_ GUARDED_BY(Locks::profiler_lock_); bool shutting_down_ GUARDED_BY(Locks::profiler_lock_); uint64_t last_time_ns_saver_woke_up_ GUARDED_BY(wait_lock_); uint32_t jit_activity_notifications_; // A local cache for the profile information. Maps each tracked file to its // profile information. This is used to cache the startup classes so that // we don't hammer the disk to save them right away. // The size of this cache is usually very small and tops // to just a few hundreds entries in the ProfileCompilationInfo objects. SafeMap profile_cache_; // Save period condition support. Mutex wait_lock_ DEFAULT_MUTEX_ACQUIRED_AFTER; ConditionVariable period_condition_ GUARDED_BY(wait_lock_); uint64_t total_bytes_written_; uint64_t total_number_of_writes_; uint64_t total_number_of_code_cache_queries_; uint64_t total_number_of_skipped_writes_; uint64_t total_number_of_failed_writes_; uint64_t total_ms_of_sleep_; uint64_t total_ns_of_work_; // TODO(calin): replace with an actual size. uint64_t max_number_of_profile_entries_cached_; uint64_t total_number_of_hot_spikes_; uint64_t total_number_of_wake_ups_; const ProfileSaverOptions options_; DISALLOW_COPY_AND_ASSIGN(ProfileSaver); }; } // namespace art #endif // ART_RUNTIME_JIT_PROFILE_SAVER_H_