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_TRACKER_H_ 18 #define SRC_TRACE_PROCESSOR_IMPORTERS_COMMON_SCHED_EVENT_TRACKER_H_ 19 20 #include "src/trace_processor/importers/common/event_tracker.h" 21 22 #include "src/trace_processor/importers/common/cpu_tracker.h" 23 #include "src/trace_processor/storage/trace_storage.h" 24 #include "src/trace_processor/types/destructible.h" 25 #include "src/trace_processor/types/trace_processor_context.h" 26 27 namespace perfetto { 28 namespace trace_processor { 29 30 // Tracks per-cpu scheduling events, storing them as slices in the |sched| 31 // table. 32 class SchedEventTracker : public Destructible { 33 public: 34 PERFETTO_ALWAYS_INLINE SchedEventTracker(TraceProcessorContext * context)35 explicit SchedEventTracker(TraceProcessorContext* context) 36 : context_(context) {} 37 SchedEventTracker(const SchedEventTracker&) = delete; 38 ~SchedEventTracker() override; 39 40 PERFETTO_ALWAYS_INLINE AddStartSlice(uint32_t cpu,int64_t ts,UniqueTid next_utid,int32_t next_prio)41 uint32_t AddStartSlice(uint32_t cpu, 42 int64_t ts, 43 UniqueTid next_utid, 44 int32_t next_prio) { 45 // Open a new scheduling slice, corresponding to the task that was 46 // just switched to. Set the duration to -1, to indicate that the event is 47 // not finished. Duration will be updated later after event finish. 48 auto* sched = context_->storage->mutable_sched_slice_table(); 49 // Get the unique CPU Id over all machines from the CPU table. 50 auto ucpu = context_->cpu_tracker->GetOrCreateCpu(cpu); 51 auto row_and_id = sched->Insert( 52 {ts, /* duration */ -1, next_utid, kNullStringId, next_prio, ucpu}); 53 SchedId sched_id = row_and_id.id; 54 return *sched->id().IndexOf(sched_id); 55 } 56 57 PERFETTO_ALWAYS_INLINE UpdateEventTrackerTimestamp(int64_t ts,const char * event_name,size_t stats)58 bool UpdateEventTrackerTimestamp(int64_t ts, 59 const char* event_name, 60 size_t stats) { 61 // Post sorter stage, all events should be globally timestamp ordered. 62 int64_t max_ts = context_->event_tracker->max_timestamp(); 63 if (ts < max_ts) { 64 PERFETTO_ELOG("%s event out of order by %.4f ms, skipping", event_name, 65 static_cast<double>(max_ts - ts) / 1e6); 66 context_->storage->IncrementStats(stats); 67 return false; 68 } 69 context_->event_tracker->UpdateMaxTimestamp(ts); 70 return true; 71 } 72 73 PERFETTO_ALWAYS_INLINE ClosePendingSlice(uint32_t pending_slice_idx,int64_t ts,StringId prev_state)74 void ClosePendingSlice(uint32_t pending_slice_idx, 75 int64_t ts, 76 StringId prev_state) { 77 auto* slices = context_->storage->mutable_sched_slice_table(); 78 79 int64_t duration = ts - slices->ts()[pending_slice_idx]; 80 slices->mutable_dur()->Set(pending_slice_idx, duration); 81 82 // We store the state as a uint16 as we only consider values up to 2048 83 // when unpacking the information inside; this allows savings of 48 bits 84 // per slice. 85 slices->mutable_end_state()->Set(pending_slice_idx, prev_state); 86 } 87 88 private: 89 TraceProcessorContext* const context_; 90 }; 91 92 } // namespace trace_processor 93 } // namespace perfetto 94 95 #endif // SRC_TRACE_PROCESSOR_IMPORTERS_COMMON_SCHED_EVENT_TRACKER_H_ 96