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| 1 // Copyright 2015 The Chromium 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 <stddef.h> | |
| 6 | |
| 7 #include "base/trace_event/trace_event.h" | |
| 8 #include "base/trace_event/trace_event_impl.h" | |
| 9 #include "base/trace_event/trace_log.h" | |
| 10 #include "base/trace_event/trace_sampling_thread.h" | |
| 11 | |
| 12 namespace base { | |
| 13 namespace trace_event { | |
| 14 | |
| 15 class TraceBucketData { | |
| 16 public: | |
| 17 TraceBucketData(base::subtle::AtomicWord* bucket, | |
| 18 const char* name, | |
| 19 TraceSampleCallback callback); | |
| 20 ~TraceBucketData(); | |
| 21 | |
| 22 TRACE_EVENT_API_ATOMIC_WORD* bucket; | |
| 23 const char* bucket_name; | |
| 24 TraceSampleCallback callback; | |
| 25 }; | |
| 26 | |
| 27 TraceSamplingThread::TraceSamplingThread() | |
| 28 : thread_running_(false), | |
| 29 waitable_event_for_testing_(WaitableEvent::ResetPolicy::AUTOMATIC, | |
| 30 WaitableEvent::InitialState::NOT_SIGNALED) {} | |
| 31 | |
| 32 TraceSamplingThread::~TraceSamplingThread() {} | |
| 33 | |
| 34 void TraceSamplingThread::ThreadMain() { | |
| 35 PlatformThread::SetName("Sampling Thread"); | |
| 36 thread_running_ = true; | |
| 37 const int kSamplingFrequencyMicroseconds = 1000; | |
| 38 while (!cancellation_flag_.IsSet()) { | |
| 39 PlatformThread::Sleep( | |
| 40 TimeDelta::FromMicroseconds(kSamplingFrequencyMicroseconds)); | |
| 41 GetSamples(); | |
| 42 waitable_event_for_testing_.Signal(); | |
| 43 } | |
| 44 } | |
| 45 | |
| 46 // static | |
| 47 void TraceSamplingThread::DefaultSamplingCallback( | |
| 48 TraceBucketData* bucket_data) { | |
| 49 TRACE_EVENT_API_ATOMIC_WORD category_and_name = | |
| 50 TRACE_EVENT_API_ATOMIC_LOAD(*bucket_data->bucket); | |
| 51 if (!category_and_name) | |
| 52 return; | |
| 53 const char* const combined = | |
| 54 reinterpret_cast<const char* const>(category_and_name); | |
| 55 const char* category_group; | |
| 56 const char* name; | |
| 57 ExtractCategoryAndName(combined, &category_group, &name); | |
| 58 TRACE_EVENT_API_ADD_TRACE_EVENT( | |
| 59 TRACE_EVENT_PHASE_SAMPLE, | |
| 60 TraceLog::GetCategoryGroupEnabled(category_group), name, | |
| 61 trace_event_internal::kGlobalScope, trace_event_internal::kNoId, 0, | |
| 62 NULL, NULL, NULL, NULL, 0); | |
| 63 } | |
| 64 | |
| 65 void TraceSamplingThread::GetSamples() { | |
| 66 for (size_t i = 0; i < sample_buckets_.size(); ++i) { | |
| 67 TraceBucketData* bucket_data = &sample_buckets_[i]; | |
| 68 bucket_data->callback.Run(bucket_data); | |
| 69 } | |
| 70 } | |
| 71 | |
| 72 void TraceSamplingThread::RegisterSampleBucket( | |
| 73 TRACE_EVENT_API_ATOMIC_WORD* bucket, | |
| 74 const char* const name, | |
| 75 TraceSampleCallback callback) { | |
| 76 // Access to sample_buckets_ doesn't cause races with the sampling thread | |
| 77 // that uses the sample_buckets_, because it is guaranteed that | |
| 78 // RegisterSampleBucket is called before the sampling thread is created. | |
| 79 DCHECK(!thread_running_); | |
| 80 sample_buckets_.push_back(TraceBucketData(bucket, name, callback)); | |
| 81 } | |
| 82 | |
| 83 // static | |
| 84 void TraceSamplingThread::ExtractCategoryAndName(const char* combined, | |
| 85 const char** category, | |
| 86 const char** name) { | |
| 87 *category = combined; | |
| 88 *name = &combined[strlen(combined) + 1]; | |
| 89 } | |
| 90 | |
| 91 void TraceSamplingThread::Stop() { | |
| 92 cancellation_flag_.Set(); | |
| 93 } | |
| 94 | |
| 95 void TraceSamplingThread::WaitSamplingEventForTesting() { | |
| 96 waitable_event_for_testing_.Wait(); | |
| 97 } | |
| 98 | |
| 99 TraceBucketData::TraceBucketData(base::subtle::AtomicWord* bucket, | |
| 100 const char* name, | |
| 101 TraceSampleCallback callback) | |
| 102 : bucket(bucket), bucket_name(name), callback(callback) {} | |
| 103 | |
| 104 TraceBucketData::~TraceBucketData() {} | |
| 105 | |
| 106 } // namespace trace_event | |
| 107 } // namespace base | |
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Chromium Code Reviews
Issue 2406703002:
tracing: remove sampling state profiler (Closed)
