| // Copyright (c) 2012 The Chromium OS Authors. All rights reserved. |
| // Use of this source code is governed by a BSD-style license that can be |
| // found in the LICENSE file. |
| |
| #ifndef CHROMIUMOS_WIDE_PROFILING_PERF_READER_H_ |
| #define CHROMIUMOS_WIDE_PROFILING_PERF_READER_H_ |
| |
| #include <stdint.h> |
| |
| #include <map> |
| #include <memory> |
| #include <set> |
| #include <string> |
| #include <vector> |
| |
| #include "base/macros.h" |
| |
| #include "chromiumos-wide-profiling/compat/string.h" |
| #include "chromiumos-wide-profiling/kernel/perf_internals.h" |
| #include "chromiumos-wide-profiling/sample_info_reader.h" |
| #include "chromiumos-wide-profiling/utils.h" |
| |
| namespace quipper { |
| |
| // This is becoming more like a partial struct perf_evsel |
| struct PerfFileAttr { |
| struct perf_event_attr attr; |
| string name; |
| std::vector<u64> ids; |
| }; |
| |
| // Based on code in tools/perf/util/header.c, the metadata are of the following |
| // formats: |
| |
| // Based on kernel/perf_internals.h |
| const size_t kBuildIDArraySize = 20; |
| const size_t kBuildIDStringLength = kBuildIDArraySize * 2; |
| |
| struct CStringWithLength { |
| u32 len; |
| string str; |
| }; |
| |
| struct PerfStringMetadata { |
| u32 type; |
| std::vector<CStringWithLength> data; |
| }; |
| |
| struct PerfUint32Metadata { |
| u32 type; |
| std::vector<uint32_t> data; |
| }; |
| |
| struct PerfUint64Metadata { |
| u32 type; |
| std::vector<uint64_t> data; |
| }; |
| |
| typedef u32 num_siblings_type; |
| |
| struct PerfCPUTopologyMetadata { |
| std::vector<CStringWithLength> core_siblings; |
| std::vector<CStringWithLength> thread_siblings; |
| }; |
| |
| struct PerfNodeTopologyMetadata { |
| u32 id; |
| u64 total_memory; |
| u64 free_memory; |
| CStringWithLength cpu_list; |
| }; |
| |
| class DataReader; |
| class DataWriter; |
| |
| class PerfReader { |
| public: |
| PerfReader() : sample_type_(0), |
| read_format_(0) {} |
| ~PerfReader(); |
| |
| // Makes |build_id| fit the perf format, by either truncating it or adding |
| // zeros to the end so that it has length kBuildIDStringLength. |
| static void PerfizeBuildIDString(string* build_id); |
| |
| // Changes |build_id| to the best guess of what the build id was before going |
| // through perf. Specifically, it keeps removing trailing sequences of four |
| // zero bytes (or eight '0' characters) until there are no more such |
| // sequences, or the build id would be empty if the process were repeated. |
| static void TrimZeroesFromBuildIDString(string* build_id); |
| |
| bool ReadFile(const string& filename); |
| bool ReadFromVector(const std::vector<char>& data); |
| bool ReadFromString(const string& str); |
| bool ReadFromPointer(const char* data, size_t size); |
| bool ReadFromData(DataReader* data); |
| |
| bool WriteFile(const string& filename); |
| bool WriteToVector(std::vector<char>* data); |
| bool WriteToString(string* str); |
| bool WriteToPointer(char* buffer, size_t size); |
| |
| // Stores the mapping from filenames to build ids in build_id_events_. |
| // Returns true on success. |
| // Note: If |filenames_to_build_ids| contains a mapping for a filename for |
| // which there is already a build_id_event in build_id_events_, a duplicate |
| // build_id_event will be created, and the old build_id_event will NOT be |
| // deleted. |
| bool InjectBuildIDs(const std::map<string, string>& filenames_to_build_ids); |
| |
| // Replaces existing filenames with filenames from |build_ids_to_filenames| |
| // by joining on build ids. If a build id in |build_ids_to_filenames| is not |
| // present in this parser, it is ignored. |
| bool Localize(const std::map<string, string>& build_ids_to_filenames); |
| |
| // Same as Localize, but joins on filenames instead of build ids. |
| bool LocalizeUsingFilenames(const std::map<string, string>& filename_map); |
| |
| // Stores a list of unique filenames found in MMAP/MMAP2 events into |
| // |filenames|. Any existing data in |filenames| will be lost. |
| void GetFilenames(std::vector<string>* filenames) const; |
| void GetFilenamesAsSet(std::set<string>* filenames) const; |
| |
| // Uses build id events to populate |filenames_to_build_ids|. |
| // Any existing data in |filenames_to_build_ids| will be lost. |
| // Note: A filename returned by GetFilenames need not be present in this map, |
| // since there may be no build id event corresponding to the MMAP/MMAP2. |
| void GetFilenamesToBuildIDs( |
| std::map<string, string>* filenames_to_build_ids) const; |
| |
| // If a program using PerfReader calls events(), it could work with the |
| // resulting events by importing kernel/perf_internals.h. This would also |
| // apply to other forms of data (attributes, event types, build ids, etc.) |
| // However, there is no easy way to work with the sample info within events. |
| // The following two methods have been added for this purpose. |
| |
| // Extracts from a perf event |event| info about the perf sample that |
| // contains the event. Stores info in |sample|. |
| bool ReadPerfSampleInfo(const event_t& event, |
| struct perf_sample* sample) const; |
| // Writes |sample| info back to a perf event |event|. |
| bool WritePerfSampleInfo(const perf_sample& sample, |
| event_t* event) const; |
| |
| // Accessor funcs. |
| const std::vector<PerfFileAttr>& attrs() const { |
| return attrs_; |
| } |
| |
| uint64_t sample_type() const { |
| return sample_type_; |
| } |
| |
| bool HaveEventNames() const { |
| for (const auto& attr : attrs_) { |
| if (attr.name.empty()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| const std::vector<malloced_unique_ptr<event_t>>& events() const { |
| return events_; |
| } |
| |
| const std::vector<malloced_unique_ptr<build_id_event>>& |
| build_id_events() const { |
| return build_id_events_; |
| } |
| |
| const std::vector<char>& tracing_data() const { |
| return tracing_data_; |
| } |
| |
| uint64_t metadata_mask() const { |
| return metadata_mask_; |
| } |
| |
| const std::vector<PerfStringMetadata>& string_metadata() const { |
| return string_metadata_; |
| } |
| |
| protected: |
| bool ReadHeader(DataReader* data); |
| |
| bool ReadAttrsSection(DataReader* data); |
| bool ReadAttr(DataReader* data); |
| bool ReadEventAttr(DataReader* data, perf_event_attr* attr); |
| bool ReadUniqueIDs(DataReader* data, size_t num_ids, std::vector<u64>* ids); |
| |
| bool ReadEventTypesSection(DataReader* data); |
| // if event_size == 0, then not in an event. |
| bool ReadEventType(DataReader* data, size_t attr_idx, size_t event_size); |
| |
| bool ReadDataSection(DataReader* data); |
| |
| // Reads metadata in normal mode. |
| bool ReadMetadata(DataReader* data); |
| |
| // The following functions read various types of metadata. |
| bool ReadTracingMetadata(DataReader* data, size_t size); |
| bool ReadBuildIDMetadata(DataReader* data, size_t size); |
| // Reads contents of a build ID event or block beyond the header. Useful for |
| // reading build IDs in piped mode, where the header must be read first in |
| // order to determine that it is a build ID event. |
| bool ReadBuildIDMetadataWithoutHeader(DataReader* data, |
| const perf_event_header& header); |
| |
| bool ReadStringMetadata(DataReader* data, u32 type, size_t size); |
| bool ReadUint32Metadata(DataReader* data, u32 type, size_t size); |
| bool ReadUint64Metadata(DataReader* data, u32 type, size_t size); |
| bool ReadCPUTopologyMetadata(DataReader* data, u32 type, size_t size); |
| bool ReadNUMATopologyMetadata(DataReader* data, u32 type, size_t size); |
| bool ReadEventDescMetadata(DataReader* data, u32 type, size_t size); |
| |
| // Read perf data from piped perf output data. |
| bool ReadPipedData(DataReader* data); |
| |
| // Returns the size in bytes that would be written by any of the methods that |
| // write the entire perf data file (WriteFile, WriteToPointer, etc). |
| size_t GetSize() const; |
| |
| // Populates |*header| with the proper contents based on the perf data that |
| // has been read. |
| void GenerateHeader(struct perf_file_header* header) const; |
| |
| // Like WriteToPointer, but does not check if the buffer is large enough. |
| bool WriteToPointerWithoutCheckingSize(char* buffer, size_t size); |
| |
| bool WriteHeader(const struct perf_file_header& header, |
| DataWriter* data) const; |
| bool WriteAttrs(const struct perf_file_header& header, |
| DataWriter* data) const; |
| bool WriteEventTypes(const struct perf_file_header& header, |
| DataWriter* data) const; |
| bool WriteData(const struct perf_file_header& header, DataWriter* data) const; |
| bool WriteMetadata(const struct perf_file_header& header, |
| DataWriter* data) const; |
| |
| // For writing the various types of metadata. |
| bool WriteBuildIDMetadata(u32 type, DataWriter* data) const; |
| bool WriteStringMetadata(u32 type, DataWriter* data) const; |
| bool WriteUint32Metadata(u32 type, DataWriter* data) const; |
| bool WriteUint64Metadata(u32 type, DataWriter* data) const; |
| bool WriteEventDescMetadata(u32 type, DataWriter* data) const; |
| bool WriteCPUTopologyMetadata(u32 type, DataWriter* data) const; |
| bool WriteNUMATopologyMetadata(u32 type, DataWriter* data) const; |
| |
| // For reading event blocks within piped perf data. |
| bool ReadAttrEventBlock(DataReader* data, size_t size); |
| |
| // Swaps byte order for non-header fields of the data structure pointed to by |
| // |event|, if |is_cross_endian| is true. Otherwise leaves the data the same. |
| void MaybeSwapEventFields(event_t* event, bool is_cross_endian); |
| |
| // Returns the number of types of metadata stored and written to output data. |
| size_t GetNumSupportedMetadata() const; |
| |
| // For computing the sizes of the various types of metadata. |
| size_t GetBuildIDMetadataSize() const; |
| size_t GetStringMetadataSize() const; |
| size_t GetUint32MetadataSize() const; |
| size_t GetUint64MetadataSize() const; |
| size_t GetEventDescMetadataSize() const; |
| size_t GetCPUTopologyMetadataSize() const; |
| size_t GetNUMATopologyMetadataSize() const; |
| |
| // Returns true if we should write the number of strings for the string |
| // metadata of type |type|. |
| bool NeedsNumberOfStringData(u32 type) const; |
| |
| // Replaces existing filenames in MMAP/MMAP2 events based on |filename_map|. |
| // This method does not change |build_id_events_|. |
| bool LocalizeMMapFilenames(const std::map<string, string>& filename_map); |
| |
| std::vector<PerfFileAttr> attrs_; |
| std::vector<malloced_unique_ptr<event_t>> events_; |
| std::vector<malloced_unique_ptr<build_id_event>> build_id_events_; |
| std::vector<PerfStringMetadata> string_metadata_; |
| std::vector<PerfUint32Metadata> uint32_metadata_; |
| std::vector<PerfUint64Metadata> uint64_metadata_; |
| PerfCPUTopologyMetadata cpu_topology_; |
| std::vector<PerfNodeTopologyMetadata> numa_topology_; |
| std::vector<char> tracing_data_; |
| uint64_t sample_type_; |
| uint64_t read_format_; |
| uint64_t metadata_mask_; |
| |
| std::unique_ptr<SampleInfoReader> sample_info_reader_; |
| |
| private: |
| // The file header is either a normal header or a piped header. |
| union { |
| struct perf_file_header header_; |
| struct perf_pipe_file_header piped_header_; |
| }; |
| struct perf_file_header out_header_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PerfReader); |
| }; |
| |
| } // namespace quipper |
| |
| #endif // CHROMIUMOS_WIDE_PROFILING_PERF_READER_H_ |