From 998c21661b5074c293cae818d0ab7c44dcda3a66 Mon Sep 17 00:00:00 2001 From: Calin Juravle Date: Mon, 21 Dec 2015 15:39:33 +0200 Subject: Perform profile file analysis in dex2oat Dex2oat can accept now multiple profile files to drive a profile based compilation. --profile-file and --reference-profile-file speficy a pair of profile files which will be evaluated for significant differences before starting the compilation. If the difference is insignificant (according to some internal metric) the compilation is skipped and a message is logged. Multiple pairs of --profile-file and --reference-profile-file can be specified. This effectively enables multi user support since profiles for different users will be kept separately. --reference-profile-file can be left out, case in which the decision is solely based on --profile-file. If both flags are present, then their repetition should form unique pairs. If the compilation is performed and --reference-profile-file is given then its data is merged with the data from the corresponding --profile- file and saved back to the file. If no profile flags are given, dex2oat proceeds as before and compiles the dex files unconditionally. As part of this change - merge ProfileCompilationInfo and OfflineProfilingInfo under the same object. There was no use to keep them separate anymore. - SaveProfilingInfo now merges the data with what was in the file before instead of overwriting it. Bug: 26080105 Change-Id: Ia8c8b55587d468bca5179f78941854285426234d --- compiler/profile_assistant.h | 61 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 61 insertions(+) create mode 100644 compiler/profile_assistant.h (limited to 'compiler/profile_assistant.h') diff --git a/compiler/profile_assistant.h b/compiler/profile_assistant.h new file mode 100644 index 0000000000..088c8bd1c7 --- /dev/null +++ b/compiler/profile_assistant.h @@ -0,0 +1,61 @@ +/* + * 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_COMPILER_PROFILE_ASSISTANT_H_ +#define ART_COMPILER_PROFILE_ASSISTANT_H_ + +#include +#include + +#include "jit/offline_profiling_info.cc" + +namespace art { + +class ProfileAssistant { + public: + // Process the profile information present in the given files. Returns true + // if the analysis ended up successfully (i.e. no errors during reading, + // merging or writing of profile files). + // + // If the returned value is true and there is a significant difference between + // profile_files and reference_profile_files: + // - profile_compilation_info is set to a not null object that + // can be used to drive compilation. It will be the merge of all the data + // found in profile_files and reference_profile_files. + // - the data from profile_files[i] is merged into + // reference_profile_files[i] and the corresponding backing file is + // updated. + // + // If the returned value is false or the difference is insignificant, + // profile_compilation_info will be set to null. + // + // Additional notes: + // - as mentioned above, this function may update the content of the files + // passed with the reference_profile_files. + // - if reference_profile_files is not empty it must be the same size as + // profile_files. + static bool ProcessProfiles( + const std::vector& profile_files, + const std::vector& reference_profile_files, + /*out*/ ProfileCompilationInfo** profile_compilation_info); + + private: + DISALLOW_COPY_AND_ASSIGN(ProfileAssistant); +}; + +} // namespace art + +#endif // ART_COMPILER_PROFILE_ASSISTANT_H_ -- cgit v1.2.3-59-g8ed1b