1 /* 2 * Copyright (C) 2024 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_COMMON_SCHED_EVENT_STATE_H_ 18 #define SRC_TRACE_PROCESSOR_IMPORTERS_COMMON_SCHED_EVENT_STATE_H_ 19 20 #include <limits> 21 #include <vector> 22 23 #include "src/trace_processor/storage/trace_storage.h" 24 25 namespace perfetto { 26 namespace trace_processor { 27 28 // Responsible for keeping the state of pending sched events. 29 // TODO(rsavitski): consider folding back into ftrace parser. The ETW parser is 30 // probably better off replicating its own pending state struct. 31 class SchedEventState { 32 public: 33 // Information retained from the preceding sched_switch seen on a given cpu. 34 struct PendingSchedInfo { 35 // The pending scheduling slice that the next event will complete. 36 uint32_t pending_slice_storage_idx = std::numeric_limits<uint32_t>::max(); 37 38 // pid/utid/prio corresponding to the last sched_switch seen on this cpu 39 // (its "next_*" fields). There is some duplication with respect to the 40 // slices storage, but we don't always have a slice when decoding events in 41 // the compact format. 42 uint32_t last_pid = std::numeric_limits<uint32_t>::max(); 43 UniqueTid last_utid = std::numeric_limits<UniqueTid>::max(); 44 int32_t last_prio = std::numeric_limits<int32_t>::max(); 45 }; 46 SchedEventState()47 SchedEventState() { 48 // Pre-allocate space for 128 CPUs, which should be enough for most hosts. 49 // It's OK if this number is too small, the vector will be grown on-demand. 50 pending_sched_per_cpu_.reserve(128); 51 } 52 SchedEventState(const SchedEventState&) = delete; 53 ~SchedEventState() = default; 54 55 // Get the sched info for the given CPU, resizing the vector if necessary. GetPendingSchedInfoForCpu(uint32_t cpu)56 PendingSchedInfo* GetPendingSchedInfoForCpu(uint32_t cpu) { 57 if (PERFETTO_UNLIKELY(cpu >= pending_sched_per_cpu_.size())) { 58 pending_sched_per_cpu_.resize(cpu + 1); 59 } 60 return &pending_sched_per_cpu_[cpu]; 61 } 62 63 private: 64 // Information retained from the preceding sched_switch seen on a given cpu. 65 std::vector<PendingSchedInfo> pending_sched_per_cpu_; 66 }; 67 68 } // namespace trace_processor 69 } // namespace perfetto 70 71 #endif // SRC_TRACE_PROCESSOR_IMPORTERS_COMMON_SCHED_EVENT_STATE_H_ 72