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Unified Diff: base/debug/activity_analyzer.h

Issue 1980743002: Track thread activities in order to diagnose hangs. (Closed) Base URL: https://chromium.googlesource.com/chromium/src.git@readwrite-mmf
Patch Set: rebased Created 4 years, 4 months ago
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Index: base/debug/activity_analyzer.h
diff --git a/base/debug/activity_analyzer.h b/base/debug/activity_analyzer.h
new file mode 100644
index 0000000000000000000000000000000000000000..5333de29166ed2d039c82f35b63b89d65e518ce2
--- /dev/null
+++ b/base/debug/activity_analyzer.h
@@ -0,0 +1,159 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_DEBUG_ACTIVITY_ANALYZER_H_
+#define BASE_DEBUG_ACTIVITY_ANALYZER_H_
+
+#include <map>
+#include <memory>
+#include <set>
+
+#include "base/base_export.h"
+#include "base/debug/activity_tracker.h"
+
+namespace base {
+namespace debug {
+
+// This class provides analysis of data captured from a ThreadActivityTracker.
+// When created, it takes a snapshot of the data held by the tracker and
+// makes that information available to other code.
+class BASE_EXPORT ThreadActivityAnalyzer {
+ public:
+ using Activity = ThreadActivityTracker::Activity;
+ using ActivitySnapshot = ThreadActivityTracker::ActivitySnapshot;
+
+ // This class provides keys that uniquely identify a thread, even across
+ // multiple processes.
+ class ThreadKey {
+ public:
+ ThreadKey(int64_t pid, int64_t tid) : pid_(pid), tid_(tid) {}
+
+ bool operator<(const ThreadKey& rhs) const {
+ if (pid_ != rhs.pid_)
+ return pid_ < rhs.pid_;
+ return tid_ < rhs.tid_;
+ }
+
+ bool operator==(const ThreadKey& rhs) const {
+ return (pid_ == rhs.pid_ && tid_ == rhs.tid_);
+ }
+
+ private:
+ int64_t pid_;
+ int64_t tid_;
+ };
+
+ // Creates an analyzer for an existing activity |tracker|. A snapshot is taken
+ // immediately and the tracker is not referenced again.
+ explicit ThreadActivityAnalyzer(const ThreadActivityTracker& tracker);
+
+ // Creates an analyzer for a block of memory currently or previously in-use
+ // by an activity-tracker. A snapshot is taken immediately and the memory
+ // is not referenced again.
+ ThreadActivityAnalyzer(void* base, size_t size);
+
+ // Creates an analyzer for a block of memory held within a persistent-memory
+ // |allocator| at the given |reference|. A snapshot is taken immediately and
+ // the memory is not referenced again.
+ ThreadActivityAnalyzer(PersistentMemoryAllocator* allocator,
+ PersistentMemoryAllocator::Reference reference);
+
+ ~ThreadActivityAnalyzer();
+
+ // Returns true iff the contained data is valid. Results from all other
+ // methods are undefined if this returns false.
+ bool IsValid() { return activity_snapshot_valid_; }
+
+ // Gets the name of the thread.
+ const std::string& GetThreadName() {
+ return activity_snapshot_.thread_name;
+ }
+
+ // Gets the TheadKey for this thread.
+ ThreadKey GetThreadKey() {
+ return ThreadKey(activity_snapshot_.process_id,
+ activity_snapshot_.thread_id);
+ }
+
+ private:
+ friend class GlobalActivityAnalyzer;
+
+ // The snapshot of the activity tracker taken at the moment of construction.
+ ActivitySnapshot activity_snapshot_;
+
+ // Flag indicating if the snapshot data is valid.
+ bool activity_snapshot_valid_;
+
+ // A reference into a persistent memory allocator, used by the global
+ // analyzer to know where this tracker came from.
+ PersistentMemoryAllocator::Reference allocator_reference_ = 0;
+
+ DISALLOW_COPY_AND_ASSIGN(ThreadActivityAnalyzer);
+};
+
+
+// This class manages analyzers for all known processes and threads as stored
+// in a persistent memory allocator. It supports retrieval of them through
+// iteration and directly using a ThreadKey, which allows for cross-references
+// to be resolved.
+// Note that though atomic snapshots are used and everything has its snapshot
+// taken at the same time, the multi-snapshot itself is not atomic and thus may
+// show small inconsistencies between threads if attempted on a live system.
+class BASE_EXPORT GlobalActivityAnalyzer {
+ public:
+ using ThreadKey = ThreadActivityAnalyzer::ThreadKey;
+
+ // Creates a global analyzer from a persistent memory allocator.
+ explicit GlobalActivityAnalyzer(
+ std::unique_ptr<PersistentMemoryAllocator> allocator);
+
+ ~GlobalActivityAnalyzer();
+
+#if !defined(OS_NACL)
+ // Creates a global analyzer using the contents of a file given in
+ // |file_path|.
+ static std::unique_ptr<GlobalActivityAnalyzer> CreateWithFile(
+ const FilePath& file_path);
+#endif // !defined(OS_NACL)
+
+ // Iterates over all known analyzers or returns null if there are no more.
+ // Ownership stays with the global analyzer object and all existing analyzer
+ // pointers are invalidated when GetFirstAnalyzer() is called.
+ ThreadActivityAnalyzer* GetFirstAnalyzer();
+ ThreadActivityAnalyzer* GetNextAnalyzer();
+
+ // Gets the analyzer for a specific thread or null if there is none.
+ // Ownership stays with the global analyzer object.
+ ThreadActivityAnalyzer* GetAnalyzerForThread(const ThreadKey& key);
+
+ private:
+ using AnalyzerMap =
+ std::map<ThreadKey, std::unique_ptr<ThreadActivityAnalyzer>>;
+
+ // Finds, creates, and indexes analyzers for all known processes and threads.
+ void PrepareAllAnalyzers();
+
+ // The persistent memory allocator holding all tracking data.
+ std::unique_ptr<PersistentMemoryAllocator> allocator_;
+
+ // The iterator for finding tracking information in the allocator.
+ PersistentMemoryAllocator::Iterator allocator_iterator_;
+
+ // A set of all tracker memory references found within the allocator.
+ std::set<PersistentMemoryAllocator::Reference> tracker_references_;
+
+ // A map, keyed by ThreadKey, of all valid activity analyzers.
+ AnalyzerMap analyzers_;
+
+ // The iterator within the analyzers_ map for returning analyzers through
+ // first/next iteration.
+ AnalyzerMap::iterator analyzers_iterator_;
+
+ DISALLOW_COPY_AND_ASSIGN(GlobalActivityAnalyzer);
+};
+
+} // namespace debug
+} // namespace base
+
+#endif // BASE_DEBUG_ACTIVITY_ANALYZER_H_
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