| /* |
| * Copyright (C) 2019 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. |
| */ |
| |
| #ifndef SRC_TRACE_PROCESSOR_FTRACE_UTILS_H_ |
| #define SRC_TRACE_PROCESSOR_FTRACE_UTILS_H_ |
| |
| #include <stddef.h> |
| |
| #include <array> |
| |
| #include "perfetto/base/optional.h" |
| |
| namespace perfetto { |
| namespace trace_processor { |
| namespace ftrace_utils { |
| |
| // A strongly typed representation of the TaskState enum given in sched_switch |
| // events. |
| class TaskState { |
| public: |
| using TaskStateStr = std::array<char, 4>; |
| |
| // The ordering and values of these fields comes from the kernel in the file |
| // https://android.googlesource.com/kernel/msm.git/+/android-msm-wahoo-4.4-pie-qpr1/include/linux/sched.h#212 |
| enum Atom : uint16_t { |
| kRunnable = 0, |
| kInterruptibleSleep = 1, |
| kUninterruptibleSleep = 2, |
| kStopped = 4, |
| kTraced = 8, |
| kExitDead = 16, |
| kExitZombie = 32, |
| kTaskDead = 64, |
| kWakeKill = 128, |
| kWaking = 256, |
| kParked = 512, |
| kNoLoad = 1024, |
| kNewTask = 2048, |
| |
| kMaxState = 4096, |
| kValid = 0x8000, |
| }; |
| |
| TaskState() = default; |
| explicit TaskState(uint16_t raw_state) : state_(raw_state | kValid) {} |
| explicit TaskState(const char* state_str); |
| |
| // Returns if this TaskState has a valid representation. |
| bool is_valid() const { return state_ & kValid; } |
| |
| // Returns the string representation of this (valid) TaskState. This array |
| // is null terminated. |
| // Note: This function CHECKs that |is_valid()| is true. |
| TaskStateStr ToString() const; |
| |
| // Returns the raw state this class was created from. |
| uint16_t raw_state() const { |
| PERFETTO_DCHECK(is_valid()); |
| return state_ & ~kValid; |
| } |
| |
| // Returns if this TaskState is runnable. |
| bool is_runnable() const { return (state_ & (kMaxState - 1)) == 0; } |
| |
| // Returns whether kernel preemption caused the exit state. |
| bool is_kernel_preempt() const { return state_ & kMaxState; } |
| |
| private: |
| uint16_t state_ = 0; |
| }; |
| |
| } // namespace ftrace_utils |
| } // namespace trace_processor |
| } // namespace perfetto |
| |
| #endif // SRC_TRACE_PROCESSOR_FTRACE_UTILS_H_ |