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| 1 // Copyright 2016 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 "base/debug/activity_analyzer.h" | |
| 6 | |
| 7 #include "base/files/file.h" | |
| 8 #include "base/files/file_path.h" | |
| 9 #include "base/files/memory_mapped_file.h" | |
| 10 #include "base/logging.h" | |
| 11 #include "base/memory/ptr_util.h" | |
| 12 #include "base/stl_util.h" | |
| 13 #include "base/strings/string_util.h" | |
| 14 | |
| 15 namespace base { | |
| 16 namespace debug { | |
| 17 | |
| 18 ThreadActivityAnalyzer::ThreadActivityAnalyzer( | |
| 19 const ThreadActivityTracker& tracker) | |
| 20 : activity_snapshot_valid_(tracker.Snapshot(&activity_snapshot_)) {} | |
| 21 | |
| 22 ThreadActivityAnalyzer::ThreadActivityAnalyzer(void* base, size_t size) | |
| 23 : ThreadActivityAnalyzer(ThreadActivityTracker(base, size)) {} | |
| 24 | |
| 25 ThreadActivityAnalyzer::ThreadActivityAnalyzer( | |
| 26 PersistentMemoryAllocator* allocator, | |
| 27 PersistentMemoryAllocator::Reference reference) | |
| 28 : ThreadActivityAnalyzer(allocator->GetAsObject<char>( | |
| 29 reference, | |
| 30 GlobalActivityTracker::kTypeIdActivityTracker), | |
| 31 allocator->GetAllocSize(reference)) {} | |
| 32 | |
| 33 ThreadActivityAnalyzer::~ThreadActivityAnalyzer() {} | |
| 34 | |
| 35 GlobalActivityAnalyzer::GlobalActivityAnalyzer( | |
| 36 std::unique_ptr<PersistentMemoryAllocator> allocator) | |
| 37 : allocator_(std::move(allocator)), allocator_iterator_(allocator_.get()) {} | |
| 38 | |
| 39 GlobalActivityAnalyzer::~GlobalActivityAnalyzer() {} | |
| 40 | |
| 41 #if !defined(OS_NACL) | |
| 42 // static | |
| 43 std::unique_ptr<GlobalActivityAnalyzer> GlobalActivityAnalyzer::CreateWithFile( | |
| 44 const FilePath& file_path) { | |
| 45 // Map the file read-write so it can guarantee consistency between | |
| 46 // the analyzer and any trackers that my still be active. | |
| 47 std::unique_ptr<MemoryMappedFile> mmfile(new MemoryMappedFile()); | |
| 48 mmfile->Initialize(file_path, MemoryMappedFile::READ_WRITE); | |
| 49 if (!mmfile->IsValid()) | |
| 50 return nullptr; | |
| 51 | |
| 52 if (!FilePersistentMemoryAllocator::IsFileAcceptable(*mmfile, true)) | |
| 53 return nullptr; | |
| 54 | |
| 55 return WrapUnique(new GlobalActivityAnalyzer( | |
| 56 WrapUnique(new FilePersistentMemoryAllocator( | |
| 57 std::move(mmfile), 0, 0, base::StringPiece(), | |
| 58 true)))); | |
| 59 } | |
| 60 #endif // !defined(OS_NACL) | |
| 61 | |
| 62 ThreadActivityAnalyzer* GlobalActivityAnalyzer::GetFirstAnalyzer() { | |
| 63 PrepareAllAnalyzers(); | |
| 64 analyzers_iterator_ = analyzers_.begin(); | |
| 65 if (analyzers_iterator_ == analyzers_.end()) | |
| 66 return nullptr; | |
| 67 return analyzers_iterator_->second.get(); | |
| 68 } | |
| 69 | |
| 70 ThreadActivityAnalyzer* GlobalActivityAnalyzer::GetNextAnalyzer() { | |
| 71 DCHECK(analyzers_iterator_ != analyzers_.end()); | |
| 72 ++analyzers_iterator_; | |
| 73 if (analyzers_iterator_ == analyzers_.end()) | |
| 74 return nullptr; | |
| 75 return analyzers_iterator_->second.get(); | |
| 76 } | |
| 77 | |
| 78 ThreadActivityAnalyzer* GlobalActivityAnalyzer::GetAnalyzerForThread( | |
| 79 const ThreadKey& key) { | |
| 80 auto found = analyzers_.find(key); | |
| 81 if (found == analyzers_.end()) | |
| 82 return nullptr; | |
| 83 return found->second.get(); | |
| 84 } | |
| 85 | |
| 86 void GlobalActivityAnalyzer::PrepareAllAnalyzers() { | |
| 87 // Fetch all the records. This will retrieve only ones created since the | |
| 88 // last run since the PMA iterator will continue from where it left off. | |
| 89 uint32_t type; | |
| 90 PersistentMemoryAllocator::Reference ref; | |
| 91 while ((ref = allocator_iterator_.GetNext(&type)) != 0) { | |
| 92 switch (type) { | |
| 93 case GlobalActivityTracker::kTypeIdActivityTracker: | |
| 94 case GlobalActivityTracker::kTypeIdActivityTrackerFree: | |
| 95 // Free or not, add it to the list of references for later analysis. | |
| 96 tracker_references_.insert(ref); | |
| 97 break; | |
| 98 } | |
| 99 } | |
| 100 | |
| 101 // Go through all the known references and create analyzers for them with | |
| 102 // snapshots of the current state. | |
| 103 analyzers_.clear(); | |
| 104 for (PersistentMemoryAllocator::Reference tracker_ref : tracker_references_) { | |
| 105 // Get the actual data segment for the tracker. This can fail if the | |
| 106 // record has been marked "free" since the type will not match. | |
| 107 void* base = allocator_->GetAsObject<char>( | |
| 108 tracker_ref, GlobalActivityTracker::kTypeIdActivityTracker); | |
| 109 if (!base) | |
| 110 continue; | |
| 111 | |
| 112 // Create the analyzer on the data. This will capture a snapshot of the | |
| 113 // tracker state. This can fail if the tracker is somehow corrupted or is | |
| 114 // in the process of shutting down. | |
| 115 std::unique_ptr<ThreadActivityAnalyzer> analyzer(new ThreadActivityAnalyzer( | |
| 116 base, allocator_->GetAllocSize(tracker_ref))); | |
| 117 if (!analyzer->IsValid()) | |
| 118 continue; | |
| 119 | |
| 120 // Add this analyzer to the map of known ones, indexed by a unique thread | |
| 121 // identifier. | |
| 122 DCHECK(!ContainsKey(analyzers_, analyzer->GetThreadKey())); | |
| 123 analyzer->allocator_reference_ = ref; | |
| 124 analyzers_[analyzer->GetThreadKey()] = std::move(analyzer); | |
| 125 } | |
| 126 } | |
| 127 | |
| 128 } // namespace debug | |
| 129 } // namespace base | |
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Chromium Code Reviews
Issue 2221343002:
Revert "Track thread activities in order to diagnose hangs." (Closed)
Base URL: https://chromium.googlesource.com/chromium/src.git@master