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/*
* Copyright (C) 2016 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.
*/
#include "profile_assistant.h"
#include "base/unix_file/fd_file.h"
#include "os.h"
namespace art {
// Minimum number of new methods/classes that profiles
// must contain to enable recompilation.
static constexpr const uint32_t kMinNewMethodsForCompilation = 10;
static constexpr const uint32_t kMinNewClassesForCompilation = 10;
ProfileAssistant::ProcessingResult ProfileAssistant::ProcessProfilesInternal(
const std::vector<ScopedFlock>& profile_files,
const ScopedFlock& reference_profile_file) {
DCHECK(!profile_files.empty());
ProfileCompilationInfo info;
// Load the reference profile.
if (!info.Load(reference_profile_file->Fd())) {
LOG(WARNING) << "Could not load reference profile file";
return kErrorBadProfiles;
}
// Store the current state of the reference profile before merging with the current profiles.
uint32_t number_of_methods = info.GetNumberOfMethods();
uint32_t number_of_classes = info.GetNumberOfResolvedClasses();
// Merge all current profiles.
for (size_t i = 0; i < profile_files.size(); i++) {
ProfileCompilationInfo cur_info;
if (!cur_info.Load(profile_files[i]->Fd())) {
LOG(WARNING) << "Could not load profile file at index " << i;
return kErrorBadProfiles;
}
if (!info.MergeWith(cur_info)) {
LOG(WARNING) << "Could not merge profile file at index " << i;
return kErrorBadProfiles;
}
}
// Check if there is enough new information added by the current profiles.
if (((info.GetNumberOfMethods() - number_of_methods) < kMinNewMethodsForCompilation) &&
((info.GetNumberOfResolvedClasses() - number_of_classes) < kMinNewClassesForCompilation)) {
return kSkipCompilation;
}
// We were successful in merging all profile information. Update the reference profile.
if (!reference_profile_file->ClearContent()) {
PLOG(WARNING) << "Could not clear reference profile file";
return kErrorIO;
}
if (!info.Save(reference_profile_file->Fd())) {
LOG(WARNING) << "Could not save reference profile file";
return kErrorIO;
}
return kCompile;
}
class ScopedFlockList {
public:
explicit ScopedFlockList(size_t size) : flocks_(size) {}
// Will block until all the locks are acquired.
bool Init(const std::vector<std::string>& filenames, /* out */ std::string* error) {
for (size_t i = 0; i < filenames.size(); i++) {
flocks_[i] = LockedFile::Open(filenames[i].c_str(), O_RDWR, /* block */ true, error);
if (flocks_[i].get() == nullptr) {
*error += " (index=" + std::to_string(i) + ")";
return false;
}
}
return true;
}
// Will block until all the locks are acquired.
bool Init(const std::vector<int>& fds, /* out */ std::string* error) {
for (size_t i = 0; i < fds.size(); i++) {
DCHECK_GE(fds[i], 0);
flocks_[i] = LockedFile::DupOf(fds[i], "profile-file",
true /* read_only_mode */, error);
if (flocks_[i].get() == nullptr) {
*error += " (index=" + std::to_string(i) + ")";
return false;
}
}
return true;
}
const std::vector<ScopedFlock>& Get() const { return flocks_; }
private:
std::vector<ScopedFlock> flocks_;
};
ProfileAssistant::ProcessingResult ProfileAssistant::ProcessProfiles(
const std::vector<int>& profile_files_fd,
int reference_profile_file_fd) {
DCHECK_GE(reference_profile_file_fd, 0);
std::string error;
ScopedFlockList profile_files(profile_files_fd.size());
if (!profile_files.Init(profile_files_fd, &error)) {
LOG(WARNING) << "Could not lock profile files: " << error;
return kErrorCannotLock;
}
// The reference_profile_file is opened in read/write mode because it's
// cleared after processing.
ScopedFlock reference_profile_file = LockedFile::DupOf(reference_profile_file_fd,
"reference-profile",
false /* read_only_mode */,
&error);
if (reference_profile_file.get() == nullptr) {
LOG(WARNING) << "Could not lock reference profiled files: " << error;
return kErrorCannotLock;
}
return ProcessProfilesInternal(profile_files.Get(), reference_profile_file);
}
ProfileAssistant::ProcessingResult ProfileAssistant::ProcessProfiles(
const std::vector<std::string>& profile_files,
const std::string& reference_profile_file) {
std::string error;
ScopedFlockList profile_files_list(profile_files.size());
if (!profile_files_list.Init(profile_files, &error)) {
LOG(WARNING) << "Could not lock profile files: " << error;
return kErrorCannotLock;
}
ScopedFlock locked_reference_profile_file = LockedFile::Open(
reference_profile_file.c_str(), O_RDWR, /* block */ true, &error);
if (locked_reference_profile_file.get() == nullptr) {
LOG(WARNING) << "Could not lock reference profile files: " << error;
return kErrorCannotLock;
}
return ProcessProfilesInternal(profile_files_list.Get(), locked_reference_profile_file);
}
} // namespace art