| /* |
| * 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. |
| */ |
| |
| #include "record_file.h" |
| |
| #include <fcntl.h> |
| #include <string.h> |
| #include <sys/mman.h> |
| #include <unistd.h> |
| #include <set> |
| #include <vector> |
| |
| #include <base/logging.h> |
| |
| #include "event_fd.h" |
| #include "perf_event.h" |
| #include "record.h" |
| #include "utils.h" |
| |
| using namespace PerfFileFormat; |
| |
| std::unique_ptr<RecordFileWriter> RecordFileWriter::CreateInstance( |
| const std::string& filename, const perf_event_attr& event_attr, |
| const std::vector<std::unique_ptr<EventFd>>& event_fds) { |
| // Remove old perf.data to avoid file ownership problems. |
| if (!RemovePossibleFile(filename)) { |
| return nullptr; |
| } |
| FILE* fp = fopen(filename.c_str(), "web+"); |
| if (fp == nullptr) { |
| PLOG(ERROR) << "failed to open record file '" << filename << "'"; |
| return nullptr; |
| } |
| |
| auto writer = std::unique_ptr<RecordFileWriter>(new RecordFileWriter(filename, fp)); |
| if (!writer->WriteAttrSection(event_attr, event_fds)) { |
| return nullptr; |
| } |
| return writer; |
| } |
| |
| RecordFileWriter::RecordFileWriter(const std::string& filename, FILE* fp) |
| : filename_(filename), |
| record_fp_(fp), |
| attr_section_offset_(0), |
| attr_section_size_(0), |
| data_section_offset_(0), |
| data_section_size_(0), |
| feature_count_(0), |
| current_feature_index_(0) { |
| } |
| |
| RecordFileWriter::~RecordFileWriter() { |
| if (record_fp_ != nullptr) { |
| Close(); |
| } |
| } |
| |
| bool RecordFileWriter::WriteAttrSection(const perf_event_attr& event_attr, |
| const std::vector<std::unique_ptr<EventFd>>& event_fds) { |
| // Skip file header part. |
| if (fseek(record_fp_, sizeof(FileHeader), SEEK_SET) == -1) { |
| return false; |
| } |
| |
| // Write id section. |
| std::vector<uint64_t> ids; |
| for (auto& event_fd : event_fds) { |
| ids.push_back(event_fd->Id()); |
| } |
| long id_section_offset = ftell(record_fp_); |
| if (id_section_offset == -1) { |
| return false; |
| } |
| if (!Write(ids.data(), ids.size() * sizeof(uint64_t))) { |
| return false; |
| } |
| |
| // Write attr section. |
| FileAttr attr; |
| attr.attr = event_attr; |
| attr.ids.offset = id_section_offset; |
| attr.ids.size = ids.size() * sizeof(uint64_t); |
| |
| long attr_section_offset = ftell(record_fp_); |
| if (attr_section_offset == -1) { |
| return false; |
| } |
| if (!Write(&attr, sizeof(attr))) { |
| return false; |
| } |
| |
| long data_section_offset = ftell(record_fp_); |
| if (data_section_offset == -1) { |
| return false; |
| } |
| |
| attr_section_offset_ = attr_section_offset; |
| attr_section_size_ = sizeof(attr); |
| data_section_offset_ = data_section_offset; |
| |
| // Save event_attr for use when reading records. |
| event_attr_ = event_attr; |
| return true; |
| } |
| |
| bool RecordFileWriter::WriteData(const void* buf, size_t len) { |
| if (!Write(buf, len)) { |
| return false; |
| } |
| data_section_size_ += len; |
| return true; |
| } |
| |
| bool RecordFileWriter::Write(const void* buf, size_t len) { |
| if (fwrite(buf, len, 1, record_fp_) != 1) { |
| PLOG(ERROR) << "failed to write to record file '" << filename_ << "'"; |
| return false; |
| } |
| return true; |
| } |
| |
| void RecordFileWriter::GetHitModulesInBuffer(const char* p, const char* end, |
| std::vector<std::string>* hit_kernel_modules, |
| std::vector<std::string>* hit_user_files) { |
| std::vector<std::unique_ptr<const Record>> kernel_mmaps; |
| std::vector<std::unique_ptr<const Record>> user_mmaps; |
| std::set<std::string> hit_kernel_set; |
| std::set<std::string> hit_user_set; |
| |
| while (p < end) { |
| auto header = reinterpret_cast<const perf_event_header*>(p); |
| CHECK_LE(p + header->size, end); |
| p += header->size; |
| std::unique_ptr<const Record> record = ReadRecordFromBuffer(event_attr_, header); |
| CHECK(record != nullptr); |
| if (record->header.type == PERF_RECORD_MMAP) { |
| if (record->header.misc & PERF_RECORD_MISC_KERNEL) { |
| kernel_mmaps.push_back(std::move(record)); |
| } else { |
| user_mmaps.push_back(std::move(record)); |
| } |
| } else if (record->header.type == PERF_RECORD_SAMPLE) { |
| auto& r = *static_cast<const SampleRecord*>(record.get()); |
| if (!(r.sample_type & PERF_SAMPLE_IP) || !(r.sample_type & PERF_SAMPLE_TID)) { |
| continue; |
| } |
| uint32_t pid = r.tid_data.pid; |
| uint64_t ip = r.ip_data.ip; |
| if (r.header.misc & PERF_RECORD_MISC_KERNEL) { |
| // Loop from back to front, because new MmapRecords are inserted at the end of the mmaps, |
| // and we want to match the newest one. |
| for (auto it = kernel_mmaps.rbegin(); it != kernel_mmaps.rend(); ++it) { |
| auto& m_record = *reinterpret_cast<const MmapRecord*>(it->get()); |
| if (ip >= m_record.data.addr && ip < m_record.data.addr + m_record.data.len) { |
| hit_kernel_set.insert(m_record.filename); |
| break; |
| } |
| } |
| } else { |
| for (auto it = user_mmaps.rbegin(); it != user_mmaps.rend(); ++it) { |
| auto& m_record = *reinterpret_cast<const MmapRecord*>(it->get()); |
| if (pid == m_record.data.pid && ip >= m_record.data.addr && |
| ip < m_record.data.addr + m_record.data.len) { |
| hit_user_set.insert(m_record.filename); |
| break; |
| } |
| } |
| } |
| } |
| } |
| hit_kernel_modules->clear(); |
| hit_kernel_modules->insert(hit_kernel_modules->begin(), hit_kernel_set.begin(), |
| hit_kernel_set.end()); |
| hit_user_files->clear(); |
| hit_user_files->insert(hit_user_files->begin(), hit_user_set.begin(), hit_user_set.end()); |
| } |
| |
| bool RecordFileWriter::GetHitModules(std::vector<std::string>* hit_kernel_modules, |
| std::vector<std::string>* hit_user_files) { |
| if (fflush(record_fp_) != 0) { |
| PLOG(ERROR) << "fflush() failed"; |
| return false; |
| } |
| uint64_t file_size; |
| if (!SeekFileEnd(&file_size)) { |
| return false; |
| } |
| size_t mmap_len = static_cast<size_t>(file_size); |
| void* mmap_addr = mmap(nullptr, mmap_len, PROT_READ, MAP_SHARED, fileno(record_fp_), 0); |
| if (mmap_addr == MAP_FAILED) { |
| PLOG(ERROR) << "mmap() failed"; |
| return false; |
| } |
| const char* data_section_p = reinterpret_cast<const char*>(mmap_addr) + data_section_offset_; |
| const char* data_section_end = data_section_p + data_section_size_; |
| GetHitModulesInBuffer(data_section_p, data_section_end, hit_kernel_modules, hit_user_files); |
| |
| if (munmap(mmap_addr, mmap_len) == -1) { |
| PLOG(ERROR) << "munmap() failed"; |
| return false; |
| } |
| return true; |
| } |
| |
| bool RecordFileWriter::SeekFileEnd(uint64_t* file_end) { |
| if (fseek(record_fp_, 0, SEEK_END) == -1) { |
| PLOG(ERROR) << "fseek() failed"; |
| return false; |
| } |
| long offset = ftell(record_fp_); |
| if (offset == -1) { |
| PLOG(ERROR) << "ftell() failed"; |
| return false; |
| } |
| *file_end = static_cast<uint64_t>(offset); |
| return true; |
| } |
| |
| bool RecordFileWriter::WriteFeatureHeader(size_t feature_count) { |
| feature_count_ = feature_count; |
| current_feature_index_ = 0; |
| uint64_t feature_header_size = feature_count * sizeof(SectionDesc); |
| |
| // Reserve enough space in the record file for the feature header. |
| std::vector<unsigned char> zero_data(feature_header_size); |
| if (fseek(record_fp_, data_section_offset_ + data_section_size_, SEEK_SET) == -1) { |
| PLOG(ERROR) << "fseek() failed"; |
| return false; |
| } |
| return Write(zero_data.data(), zero_data.size()); |
| } |
| |
| bool RecordFileWriter::WriteBuildIdFeature(const std::vector<BuildIdRecord>& build_id_records) { |
| uint64_t start_offset; |
| if (!WriteFeatureBegin(&start_offset)) { |
| return false; |
| } |
| for (auto& record : build_id_records) { |
| std::vector<char> data = record.BinaryFormat(); |
| if (!Write(data.data(), data.size())) { |
| return false; |
| } |
| } |
| return WriteFeatureEnd(FEAT_BUILD_ID, start_offset); |
| } |
| |
| bool RecordFileWriter::WriteCmdlineFeature(const std::vector<std::string>& cmdline) { |
| uint64_t start_offset; |
| if (!WriteFeatureBegin(&start_offset)) { |
| return false; |
| } |
| uint32_t arg_count = cmdline.size(); |
| if (!Write(&arg_count, sizeof(arg_count))) { |
| return false; |
| } |
| for (auto& arg : cmdline) { |
| uint32_t len = static_cast<uint32_t>(ALIGN(arg.size() + 1, 64)); |
| if (!Write(&len, sizeof(len))) { |
| return false; |
| } |
| std::vector<char> array(len, '\0'); |
| std::copy(arg.begin(), arg.end(), array.begin()); |
| if (!Write(array.data(), array.size())) { |
| return false; |
| } |
| } |
| return WriteFeatureEnd(FEAT_CMDLINE, start_offset); |
| } |
| |
| bool RecordFileWriter::WriteBranchStackFeature() { |
| uint64_t start_offset; |
| if (!WriteFeatureBegin(&start_offset)) { |
| return false; |
| } |
| return WriteFeatureEnd(FEAT_BRANCH_STACK, start_offset); |
| } |
| |
| bool RecordFileWriter::WriteFeatureBegin(uint64_t* start_offset) { |
| CHECK_LT(current_feature_index_, feature_count_); |
| if (!SeekFileEnd(start_offset)) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool RecordFileWriter::WriteFeatureEnd(int feature, uint64_t start_offset) { |
| uint64_t end_offset; |
| if (!SeekFileEnd(&end_offset)) { |
| return false; |
| } |
| SectionDesc desc; |
| desc.offset = start_offset; |
| desc.size = end_offset - start_offset; |
| uint64_t feature_offset = data_section_offset_ + data_section_size_; |
| if (fseek(record_fp_, feature_offset + current_feature_index_ * sizeof(SectionDesc), SEEK_SET) == |
| -1) { |
| PLOG(ERROR) << "fseek() failed"; |
| return false; |
| } |
| if (!Write(&desc, sizeof(SectionDesc))) { |
| return false; |
| } |
| ++current_feature_index_; |
| features_.push_back(feature); |
| return true; |
| } |
| |
| bool RecordFileWriter::WriteFileHeader() { |
| FileHeader header; |
| memset(&header, 0, sizeof(header)); |
| memcpy(header.magic, PERF_MAGIC, sizeof(header.magic)); |
| header.header_size = sizeof(header); |
| header.attr_size = sizeof(FileAttr); |
| header.attrs.offset = attr_section_offset_; |
| header.attrs.size = attr_section_size_; |
| header.data.offset = data_section_offset_; |
| header.data.size = data_section_size_; |
| for (auto& feature : features_) { |
| int i = feature / 8; |
| int j = feature % 8; |
| header.features[i] |= (1 << j); |
| } |
| |
| if (fseek(record_fp_, 0, SEEK_SET) == -1) { |
| return false; |
| } |
| if (!Write(&header, sizeof(header))) { |
| return false; |
| } |
| return true; |
| } |
| |
| bool RecordFileWriter::Close() { |
| CHECK(record_fp_ != nullptr); |
| bool result = true; |
| |
| // Write file header. We gather enough information to write file header only after |
| // writing data section and feature section. |
| if (!WriteFileHeader()) { |
| result = false; |
| } |
| |
| if (fclose(record_fp_) != 0) { |
| PLOG(ERROR) << "failed to close record file '" << filename_ << "'"; |
| result = false; |
| } |
| record_fp_ = nullptr; |
| return result; |
| } |