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
diff --git a/compiler/driver/compiler_driver.cc b/compiler/driver/compiler_driver.cc
index afb4b71..043bd93 100644
--- a/compiler/driver/compiler_driver.cc
+++ b/compiler/driver/compiler_driver.cc
@@ -347,8 +347,8 @@
size_t thread_count, bool dump_stats, bool dump_passes,
const std::string& dump_cfg_file_name, bool dump_cfg_append,
CumulativeLogger* timer, int swap_fd,
- const std::string& profile_file,
- const std::unordered_map<const DexFile*, const char*>* dex_to_oat_map)
+ const std::unordered_map<const DexFile*, const char*>* dex_to_oat_map,
+ const ProfileCompilationInfo* profile_compilation_info)
: compiler_options_(compiler_options),
verification_results_(verification_results),
method_inliner_map_(method_inliner_map),
@@ -377,7 +377,8 @@
support_boot_image_fixup_(instruction_set != kMips && instruction_set != kMips64),
dex_files_for_oat_file_(nullptr),
dex_file_oat_filename_map_(dex_to_oat_map),
- compiled_method_storage_(swap_fd) {
+ compiled_method_storage_(swap_fd),
+ profile_compilation_info_(profile_compilation_info) {
DCHECK(compiler_options_ != nullptr);
DCHECK(verification_results_ != nullptr);
DCHECK(method_inliner_map_ != nullptr);
@@ -385,12 +386,6 @@
compiler_->Init();
CHECK_EQ(boot_image_, image_classes_.get() != nullptr);
-
- // Read the profile file if one is provided.
- if (!profile_file.empty()) {
- profile_compilation_info_.reset(new ProfileCompilationInfo(profile_file));
- LOG(INFO) << "Using profile data from file " << profile_file;
- }
}
CompilerDriver::~CompilerDriver() {
@@ -2306,15 +2301,11 @@
void CompilerDriver::Compile(jobject class_loader, const std::vector<const DexFile*>& dex_files,
ThreadPool* thread_pool, TimingLogger* timings) {
- if (profile_compilation_info_ != nullptr) {
- if (!profile_compilation_info_->Load(dex_files)) {
- LOG(WARNING) << "Failed to load offline profile info from "
- << profile_compilation_info_->GetFilename()
- << ". No methods will be compiled";
- } else if (kDebugProfileGuidedCompilation) {
- LOG(INFO) << "[ProfileGuidedCompilation] "
- << profile_compilation_info_->DumpInfo();
- }
+ if (kDebugProfileGuidedCompilation) {
+ LOG(INFO) << "[ProfileGuidedCompilation] " <<
+ ((profile_compilation_info_ == nullptr)
+ ? "null"
+ : profile_compilation_info_->DumpInfo(&dex_files));
}
for (size_t i = 0; i != dex_files.size(); ++i) {
const DexFile* dex_file = dex_files[i];