Index: base/trace_event/sharded_allocation_register.cc |
diff --git a/base/trace_event/sharded_allocation_register.cc b/base/trace_event/sharded_allocation_register.cc |
new file mode 100644 |
index 0000000000000000000000000000000000000000..80895211637802da59b943fc3ec37b38be951687 |
--- /dev/null |
+++ b/base/trace_event/sharded_allocation_register.cc |
@@ -0,0 +1,105 @@ |
+// Copyright 2017 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. |
+ |
+#include "base/trace_event/sharded_allocation_register.h" |
+ |
+#include "base/trace_event/trace_event_memory_overhead.h" |
+#include "build/build_config.h" |
+ |
+namespace base { |
+namespace trace_event { |
+ |
+// This number affects the bucket and capacity counts of AllocationRegister at |
+// "base/trace_event/heap_profiler_allocation_register.h". |
+#if defined(OS_ANDROID) || defined(OS_IOS) |
+size_t ShardCount = 1; |
+#else |
+size_t ShardCount = 64; |
+#endif |
+ |
+size_t HashAddress(const void* address) { |
Primiano Tucci (use gerrit)
2017/05/22 16:37:51
since this is copy-pasted from a header that is in
erikchen
2017/05/22 17:10:43
Done.
|
+ // The multiplicative hashing scheme from [Knuth 1998]. |
+ const uintptr_t key = reinterpret_cast<uintptr_t>(address); |
+ const uintptr_t a = 131101; |
+ const uintptr_t shift = 15; |
+ const uintptr_t h = (key * a) >> shift; |
+ return h; |
+} |
+ |
+ShardedAllocationRegister::ShardedAllocationRegister() : enabled_(false) {} |
+ |
+ShardedAllocationRegister::~ShardedAllocationRegister() = default; |
+ |
+void ShardedAllocationRegister::Initialize() { |
+ allocation_registers_.resize(ShardCount); |
+ for (std::unique_ptr<RegisterAndLock>& ral : allocation_registers_) |
+ ral.reset(new RegisterAndLock); |
Primiano Tucci (use gerrit)
2017/05/22 16:37:51
doesn't make a difference here (so I don't care ab
erikchen
2017/05/22 17:10:43
Done.
|
+} |
+ |
+bool ShardedAllocationRegister::IsInitialized() const { |
+ return !allocation_registers_.empty(); |
+} |
+ |
+void ShardedAllocationRegister::SetEnabled(bool enabled) { |
Primiano Tucci (use gerrit)
2017/05/22 16:37:50
I would remove this method and do this in initiali
erikchen
2017/05/22 17:10:43
Done. [SetEnabled and SetDisabled]
|
+ base::subtle::Release_Store(&enabled_, enabled ? 1 : 0); |
+} |
+ |
+bool ShardedAllocationRegister::IsEnabled() const { |
+ return base::subtle::Acquire_Load(&enabled_); |
Primiano Tucci (use gerrit)
2017/05/22 16:37:51
I'd make move this to the header file and turn int
erikchen
2017/05/22 17:10:43
Done.
|
+} |
+ |
+bool ShardedAllocationRegister::Insert(const void* address, |
+ size_t size, |
+ const AllocationContext& context) { |
+ size_t index = HashAddress(address) % ShardCount; |
+ std::unique_ptr<RegisterAndLock>& ral = allocation_registers_[index]; |
+ AutoLock lock(ral->lock); |
+ return ral->allocation_register.Insert(address, size, context); |
+} |
+ |
+void ShardedAllocationRegister::Remove(const void* address) { |
+ size_t index = HashAddress(address) % ShardCount; |
+ std::unique_ptr<RegisterAndLock>& ral = allocation_registers_[index]; |
+ AutoLock lock(ral->lock); |
+ return ral->allocation_register.Remove(address); |
+} |
+ |
+void ShardedAllocationRegister::EstimateTraceMemoryOverhead( |
+ TraceEventMemoryOverhead* overhead) const { |
+ size_t allocated = 0; |
+ size_t resident = 0; |
+ for (const std::unique_ptr<RegisterAndLock>& ral : allocation_registers_) { |
+ AutoLock lock(ral->lock); |
+ allocated += ral->allocation_register.EstimateAllocatedMemory(); |
+ resident += ral->allocation_register.EstimateResidentMemory(); |
+ } |
+ |
+ overhead->Add(TraceEventMemoryOverhead::kHeapProfilerAllocationRegister, |
+ allocated, resident); |
+} |
+ |
+ShardedAllocationRegister::OutputMetrics |
+ShardedAllocationRegister::UpdateAndReturnsMetrics(MetricsMap& map) const { |
+ OutputMetrics output_metrics; |
+ output_metrics.size = 0; |
+ output_metrics.count = 0; |
+ for (const std::unique_ptr<RegisterAndLock>& ral : allocation_registers_) { |
+ AutoLock lock(ral->lock); |
+ for (const auto& alloc_size : ral->allocation_register) { |
+ AllocationMetrics& metrics = map[alloc_size.context]; |
+ metrics.size += alloc_size.size; |
+ metrics.count++; |
+ |
+ output_metrics.size += alloc_size.size; |
+ output_metrics.count++; |
+ } |
+ } |
+ return output_metrics; |
+} |
+ |
+ShardedAllocationRegister::RegisterAndLock::RegisterAndLock() = default; |
+ShardedAllocationRegister::RegisterAndLock::~RegisterAndLock() = default; |
+ |
+} // namespace trace_event |
+} // namespace base |