1 // Copyright 2016 The Chromium OS Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #include "perf_data_utils.h" 6 7 #include <string> 8 9 #include "base/logging.h" 10 #include "compat/proto.h" 11 12 namespace quipper { 13 14 event_t* CallocMemoryForEvent(size_t size) { 15 event_t* event = reinterpret_cast<event_t*>(calloc(1, size)); 16 CHECK(event); 17 return event; 18 } 19 20 event_t* ReallocMemoryForEvent(event_t* event, size_t new_size) { 21 event_t* new_event = reinterpret_cast<event_t*>(realloc(event, new_size)); 22 CHECK(new_event); // NB: event is "leaked" if this CHECK fails. 23 return new_event; 24 } 25 26 build_id_event* CallocMemoryForBuildID(size_t size) { 27 build_id_event* event = reinterpret_cast<build_id_event*>(calloc(1, size)); 28 CHECK(event); 29 return event; 30 } 31 32 void PerfizeBuildIDString(string* build_id) { 33 build_id->resize(kBuildIDStringLength, '0'); 34 } 35 36 void TrimZeroesFromBuildIDString(string* build_id) { 37 const size_t kPaddingSize = 8; 38 const string kBuildIDPadding = string(kPaddingSize, '0'); 39 40 // Remove kBuildIDPadding from the end of build_id until we cannot remove any 41 // more. The build ID string can be reduced down to an empty string. This 42 // could happen if the file did not have a build ID but was given a build ID 43 // of all zeroes. The empty build ID string would reflect the original lack of 44 // build ID. 45 while (build_id->size() >= kPaddingSize && 46 build_id->substr(build_id->size() - kPaddingSize) == kBuildIDPadding) { 47 build_id->resize(build_id->size() - kPaddingSize); 48 } 49 } 50 51 const PerfDataProto_SampleInfo* GetSampleInfoForEvent( 52 const PerfDataProto_PerfEvent& event) { 53 switch (event.header().type()) { 54 case PERF_RECORD_MMAP: 55 case PERF_RECORD_MMAP2: 56 return &event.mmap_event().sample_info(); 57 case PERF_RECORD_COMM: 58 return &event.comm_event().sample_info(); 59 case PERF_RECORD_FORK: 60 return &event.fork_event().sample_info(); 61 case PERF_RECORD_EXIT: 62 return &event.exit_event().sample_info(); 63 case PERF_RECORD_LOST: 64 return &event.lost_event().sample_info(); 65 case PERF_RECORD_THROTTLE: 66 case PERF_RECORD_UNTHROTTLE: 67 return &event.throttle_event().sample_info(); 68 case PERF_RECORD_READ: 69 return &event.read_event().sample_info(); 70 case PERF_RECORD_AUX: 71 return &event.aux_event().sample_info(); 72 } 73 return nullptr; 74 } 75 76 // Returns the correct |sample_time_ns| field of a PerfEvent. 77 uint64_t GetTimeFromPerfEvent(const PerfDataProto_PerfEvent& event) { 78 if (event.header().type() == PERF_RECORD_SAMPLE) 79 return event.sample_event().sample_time_ns(); 80 81 const auto* sample_info = GetSampleInfoForEvent(event); 82 if (sample_info) return sample_info->sample_time_ns(); 83 84 return 0; 85 } 86 87 } // namespace quipper 88
