1 /* 2 * Copyright (C) 2019 The Android Open Source Project 3 * 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 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 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. 15 */ 16 17 #ifndef SRC_TRACE_PROCESSOR_IMPORTERS_SYSCALLS_SYSCALL_TRACKER_H_ 18 #define SRC_TRACE_PROCESSOR_IMPORTERS_SYSCALLS_SYSCALL_TRACKER_H_ 19 20 #include <limits> 21 #include <tuple> 22 23 #include "perfetto/ext/base/string_view.h" 24 #include "src/trace_processor/importers/common/slice_tracker.h" 25 #include "src/trace_processor/importers/common/track_tracker.h" 26 #include "src/trace_processor/storage/trace_storage.h" 27 #include "src/trace_processor/types/destructible.h" 28 #include "src/trace_processor/types/trace_processor_context.h" 29 30 namespace perfetto { 31 namespace trace_processor { 32 33 static constexpr size_t kMaxSyscalls = 550; 34 35 enum Architecture { 36 kUnknown = 0, 37 kArmEabi, // 32-bit kernel running a 32-bit process (most old devices). 38 kAarch32, // 64-bit kernel running a 32-bit process (should be rare). 39 kAarch64, // 64-bit kernel running a 64-bit process (most new devices). 40 kX86_64, 41 kX86, 42 }; 43 44 class SyscallTracker : public Destructible { 45 public: 46 SyscallTracker(const SyscallTracker&) = delete; 47 SyscallTracker& operator=(const SyscallTracker&) = delete; 48 ~SyscallTracker() override; GetOrCreate(TraceProcessorContext * context)49 static SyscallTracker* GetOrCreate(TraceProcessorContext* context) { 50 if (!context->syscall_tracker) { 51 context->syscall_tracker.reset(new SyscallTracker(context)); 52 } 53 return static_cast<SyscallTracker*>(context->syscall_tracker.get()); 54 } 55 56 void SetArchitecture(Architecture architecture); 57 Enter(int64_t ts,UniqueTid utid,uint32_t syscall_num)58 void Enter(int64_t ts, UniqueTid utid, uint32_t syscall_num) { 59 StringId name = SyscallNumberToStringId(syscall_num); 60 if (!name.is_null()) { 61 TrackId track_id = context_->track_tracker->InternThreadTrack(utid); 62 context_->slice_tracker->Begin(ts, track_id, kNullStringId /* cat */, 63 name); 64 } 65 } 66 Exit(int64_t ts,UniqueTid utid,uint32_t syscall_num)67 void Exit(int64_t ts, UniqueTid utid, uint32_t syscall_num) { 68 StringId name = SyscallNumberToStringId(syscall_num); 69 if (!name.is_null()) { 70 TrackId track_id = context_->track_tracker->InternThreadTrack(utid); 71 context_->slice_tracker->End(ts, track_id, kNullStringId /* cat */, name); 72 } 73 } 74 75 private: 76 explicit SyscallTracker(TraceProcessorContext*); 77 78 TraceProcessorContext* const context_; 79 SyscallNumberToStringId(uint32_t syscall_num)80 inline StringId SyscallNumberToStringId(uint32_t syscall_num) { 81 if (syscall_num > kMaxSyscalls) 82 return kNullStringId; 83 // We see two write sys calls around each userspace slice that is going via 84 // trace_marker, this violates the assumption that userspace slices are 85 // perfectly nested. For the moment ignore all write sys calls. 86 // TODO(hjd): Remove this limitation. 87 StringId id = arch_syscall_to_string_id_[syscall_num]; 88 if (id == sys_write_string_id_) 89 return kNullStringId; 90 return id; 91 } 92 93 // This is table from platform specific syscall number directly to 94 // the relevant StringId (this avoids having to always do two conversions). 95 std::array<StringId, kMaxSyscalls> arch_syscall_to_string_id_{}; 96 StringId sys_write_string_id_ = std::numeric_limits<StringId>::max(); 97 }; 98 99 } // namespace trace_processor 100 } // namespace perfetto 101 102 #endif // SRC_TRACE_PROCESSOR_IMPORTERS_SYSCALLS_SYSCALL_TRACKER_H_ 103