2 * Copyright (C) 2015 The Android Open Source Project
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
8 * http://www.apache.org/licenses/LICENSE-2.0
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
17 #ifndef SIMPLE_PERF_RECORD_H_
18 #define SIMPLE_PERF_RECORD_H_
21 #include <sys/types.h>
28 #include "perf_event.h"
35 enum user_record_type {
36 PERF_RECORD_ATTR = 64,
37 PERF_RECORD_EVENT_TYPE,
38 PERF_RECORD_TRACING_DATA,
40 PERF_RECORD_FINISHED_ROUND,
43 struct PerfSampleIpType {
47 struct PerfSampleTidType {
51 struct PerfSampleTimeType {
55 struct PerfSampleAddrType {
59 struct PerfSampleIdType {
63 struct PerfSampleStreamIdType {
67 struct PerfSampleCpuType {
71 struct PerfSamplePeriodType {
75 struct PerfSampleCallChainType {
76 std::vector<uint64_t> ips;
79 struct PerfSampleRawType {
80 std::vector<char> data;
83 struct PerfSampleBranchStackType {
84 struct BranchStackItemType {
89 std::vector<BranchStackItemType> stack;
92 struct PerfSampleRegsUserType {
95 std::vector<uint64_t> regs;
98 struct PerfSampleStackUserType {
99 std::vector<char> data;
103 // SampleId is optional at the end of a record in binary format. Its content is determined by
104 // sample_id_all and sample_type in perf_event_attr. To avoid the complexity of referring to
105 // perf_event_attr each time, we copy sample_id_all and sample_type inside the SampleId structure.
108 uint64_t sample_type;
110 PerfSampleTidType tid_data; // Valid if sample_id_all && PERF_SAMPLE_TID.
111 PerfSampleTimeType time_data; // Valid if sample_id_all && PERF_SAMPLE_TIME.
112 PerfSampleIdType id_data; // Valid if sample_id_all && PERF_SAMPLE_ID.
113 PerfSampleStreamIdType stream_id_data; // Valid if sample_id_all && PERF_SAMPLE_STREAM_ID.
114 PerfSampleCpuType cpu_data; // Valid if sample_id_all && PERF_SAMPLE_CPU.
118 // Create the content of sample_id. It depends on the attr we use.
119 size_t CreateContent(const perf_event_attr& attr);
121 // Parse sample_id from binary format in the buffer pointed by p.
122 void ReadFromBinaryFormat(const perf_event_attr& attr, const char* p, const char* end);
124 // Write the binary format of sample_id to the buffer pointed by p.
125 void WriteToBinaryFormat(char*& p) const;
126 void Dump(size_t indent) const;
129 // Usually one record contains the following three parts in order in binary format:
130 // perf_event_header (at the head of a record, containing type and size information)
131 // data depends on the record type
132 // sample_id (optional part at the end of a record)
133 // We hold the common parts (perf_event_header and sample_id) in the base class Record, and
134 // hold the type specific data part in classes derived from Record.
136 perf_event_header header;
140 Record(const perf_event_header* pheader);
145 size_t size() const {
149 uint32_t type() const {
153 void Dump(size_t indent = 0) const;
154 virtual std::vector<char> BinaryFormat() const = 0;
155 virtual uint64_t Timestamp() const;
158 virtual void DumpData(size_t) const = 0;
161 struct MmapRecord : public Record {
162 struct MmapRecordDataType {
168 std::string filename;
170 MmapRecord() { // For CreateMmapRecord.
173 MmapRecord(const perf_event_attr& attr, const perf_event_header* pheader);
174 std::vector<char> BinaryFormat() const override;
177 void DumpData(size_t indent) const override;
180 struct Mmap2Record : public Record {
181 struct Mmap2RecordDataType {
189 uint64_t ino_generation;
190 uint32_t prot, flags;
192 std::string filename;
197 Mmap2Record(const perf_event_attr& attr, const perf_event_header* pheader);
198 std::vector<char> BinaryFormat() const override;
201 void DumpData(size_t indent) const override;
204 struct CommRecord : public Record {
205 struct CommRecordDataType {
213 CommRecord(const perf_event_attr& attr, const perf_event_header* pheader);
214 std::vector<char> BinaryFormat() const override;
217 void DumpData(size_t indent) const override;
220 struct ExitOrForkRecord : public Record {
221 struct ExitOrForkRecordDataType {
229 ExitOrForkRecord(const perf_event_attr& attr, const perf_event_header* pheader);
230 std::vector<char> BinaryFormat() const override;
233 void DumpData(size_t indent) const override;
236 struct ExitRecord : public ExitOrForkRecord {
237 ExitRecord(const perf_event_attr& attr, const perf_event_header* pheader)
238 : ExitOrForkRecord(attr, pheader) {
242 struct ForkRecord : public ExitOrForkRecord {
245 ForkRecord(const perf_event_attr& attr, const perf_event_header* pheader)
246 : ExitOrForkRecord(attr, pheader) {
250 struct SampleRecord : public Record {
251 uint64_t sample_type; // sample_type is a bit mask determining which fields below are valid.
253 PerfSampleIpType ip_data; // Valid if PERF_SAMPLE_IP.
254 PerfSampleTidType tid_data; // Valid if PERF_SAMPLE_TID.
255 PerfSampleTimeType time_data; // Valid if PERF_SAMPLE_TIME.
256 PerfSampleAddrType addr_data; // Valid if PERF_SAMPLE_ADDR.
257 PerfSampleIdType id_data; // Valid if PERF_SAMPLE_ID.
258 PerfSampleStreamIdType stream_id_data; // Valid if PERF_SAMPLE_STREAM_ID.
259 PerfSampleCpuType cpu_data; // Valid if PERF_SAMPLE_CPU.
260 PerfSamplePeriodType period_data; // Valid if PERF_SAMPLE_PERIOD.
262 PerfSampleCallChainType callchain_data; // Valid if PERF_SAMPLE_CALLCHAIN.
263 PerfSampleRawType raw_data; // Valid if PERF_SAMPLE_RAW.
264 PerfSampleBranchStackType branch_stack_data; // Valid if PERF_SAMPLE_BRANCH_STACK.
265 PerfSampleRegsUserType regs_user_data; // Valid if PERF_SAMPLE_REGS_USER.
266 PerfSampleStackUserType stack_user_data; // Valid if PERF_SAMPLE_STACK_USER.
268 SampleRecord(const perf_event_attr& attr, const perf_event_header* pheader);
269 std::vector<char> BinaryFormat() const override;
270 void AdjustSizeBasedOnData();
271 uint64_t Timestamp() const override;
274 void DumpData(size_t indent) const override;
277 // BuildIdRecord is defined in user-space, stored in BuildId feature section in record file.
278 struct BuildIdRecord : public Record {
281 std::string filename;
286 BuildIdRecord(const perf_event_header* pheader);
287 std::vector<char> BinaryFormat() const override;
290 void DumpData(size_t indent) const override;
293 // UnknownRecord is used for unknown record types, it makes sure all unknown records
294 // are not changed when modifying perf.data.
295 struct UnknownRecord : public Record {
296 std::vector<char> data;
298 UnknownRecord(const perf_event_header* pheader);
299 std::vector<char> BinaryFormat() const override;
302 void DumpData(size_t indent) const override;
305 // RecordCache is a cache used when receiving records from the kernel.
306 // It sorts received records based on type and timestamp, and pops records
307 // in sorted order. Records from the kernel need to be sorted because
308 // records may come from different cpus at the same time, and it is affected
309 // by the order in which we collect records from different cpus.
310 // RecordCache pushes records and pops sorted record online. It uses two checks to help
311 // ensure that records are popped in order. Each time we pop a record A, it is the earliest record
312 // among all records in the cache. In addition, we have checks for min_cache_size and
313 // min_time_diff. For min_cache_size check, we check if the cache size >= min_cache_size,
314 // which is based on the assumption that if we have received (min_cache_size - 1) records
315 // after record A, we are not likely to receive a record earlier than A. For min_time_diff
316 // check, we check if record A is generated min_time_diff ns earlier than the latest
317 // record, which is based on the assumption that if we have received a record for time t,
318 // we are not likely to receive a record for time (t - min_time_diff) or earlier.
321 RecordCache(const perf_event_attr& attr, size_t min_cache_size = 1000u,
322 uint64_t min_time_diff_in_ns = 1000000u);
324 void Push(const char* data, size_t size);
325 void Push(std::unique_ptr<Record> record);
326 std::unique_ptr<Record> Pop();
327 std::vector<std::unique_ptr<Record>> PopAll();
330 struct RecordComparator {
331 bool operator()(const Record* r1, const Record* r2);
334 const perf_event_attr attr_;
336 size_t min_cache_size_;
337 uint64_t min_time_diff_in_ns_;
339 std::priority_queue<Record*, std::vector<Record*>, RecordComparator> queue_;
342 std::vector<std::unique_ptr<Record>> ReadRecordsFromBuffer(const perf_event_attr& attr,
343 const char* buf, size_t buf_size);
344 std::unique_ptr<Record> ReadRecordFromFile(const perf_event_attr& attr, FILE* fp);
345 MmapRecord CreateMmapRecord(const perf_event_attr& attr, bool in_kernel, uint32_t pid, uint32_t tid,
346 uint64_t addr, uint64_t len, uint64_t pgoff,
347 const std::string& filename);
348 CommRecord CreateCommRecord(const perf_event_attr& attr, uint32_t pid, uint32_t tid,
349 const std::string& comm);
350 ForkRecord CreateForkRecord(const perf_event_attr& attr, uint32_t pid, uint32_t tid, uint32_t ppid,
352 BuildIdRecord CreateBuildIdRecord(bool in_kernel, pid_t pid, const BuildId& build_id,
353 const std::string& filename);
355 #endif // SIMPLE_PERF_RECORD_H_