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Unified Diff: base/memory/shared_memory_tracker.cc

Issue 2654073002: base: Introduce SharedMemoryTracker for POSIX (but not macOS) (Closed)
Patch Set: Address on Dana's review Created 3 years, 9 months ago
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Index: base/memory/shared_memory_tracker.cc
diff --git a/base/memory/shared_memory_tracker.cc b/base/memory/shared_memory_tracker.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8613f595336ada19357c900cf0ab9bf4d243b7f4
--- /dev/null
+++ b/base/memory/shared_memory_tracker.cc
@@ -0,0 +1,92 @@
+// 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/memory/shared_memory_tracker.h"
+
+#include "base/memory/shared_memory.h"
+#include "base/strings/stringprintf.h"
+#include "base/trace_event/memory_dump_manager.h"
+#include "base/trace_event/process_memory_dump.h"
+
+namespace base {
+
+SharedMemoryTracker::Usage::Usage() = default;
+
+SharedMemoryTracker::Usage::Usage(const Usage& rhs) = default;
+
+SharedMemoryTracker::Usage::~Usage() = default;
+
+// static
+SharedMemoryTracker* SharedMemoryTracker::GetInstance() {
+ static SharedMemoryTracker* instance = new SharedMemoryTracker;
+ return instance;
+}
+
+void SharedMemoryTracker::IncrementMemoryUsage(
+ const SharedMemory& shared_memory) {
+ Usage usage;
+ // |shared_memory|'s unique ID must be generated here and it'd be too late at
+ // OnMemoryDump. An ID is generated with a SharedMemoryHandle, but the handle
+ // might already be closed at that time. Now IncrementMemoryUsage is called
+ // just after mmap and the handle must live then. See the discussion at
+ // crbug.com/604726#c30.
+ SharedMemory::UniqueId id;
+ if (!shared_memory.GetUniqueId(&id))
+ return;
+ usage.unique_id = id;
+ usage.size = shared_memory.mapped_size();
+ AutoLock hold(usages_lock_);
+ usages_[&shared_memory] = usage;
+}
+
+void SharedMemoryTracker::DecrementMemoryUsage(
+ const SharedMemory& shared_memory) {
+ AutoLock hold(usages_lock_);
+ usages_.erase(&shared_memory);
+}
+
+bool SharedMemoryTracker::OnMemoryDump(const trace_event::MemoryDumpArgs& args,
+ trace_event::ProcessMemoryDump* pmd) {
+ std::unordered_map<SharedMemory::UniqueId, size_t, SharedMemory::UniqueIdHash>
+ sizes;
+ {
+ AutoLock hold(usages_lock_);
+ for (const auto& usage : usages_)
+ sizes[usage.second.unique_id] += usage.second.size;
+ }
+ for (auto& size : sizes) {
+ const SharedMemory::UniqueId& id = size.first;
+ std::string dump_name = StringPrintf("%s/%lld.%lld", "shared_memory",
+ static_cast<long long>(id.first),
+ static_cast<long long>(id.second));
+ auto guid = trace_event::MemoryAllocatorDumpGuid(dump_name);
+ trace_event::MemoryAllocatorDump* local_dump =
+ pmd->CreateAllocatorDump(dump_name);
+ // TODO(hajimehoshi): The size is not resident size but virtual size so far.
+ // Fix this to record resident size.
+ local_dump->AddScalar(trace_event::MemoryAllocatorDump::kNameSize,
+ trace_event::MemoryAllocatorDump::kUnitsBytes,
+ size.second);
+ trace_event::MemoryAllocatorDump* global_dump =
+ pmd->CreateSharedGlobalAllocatorDump(guid);
+ global_dump->AddScalar(trace_event::MemoryAllocatorDump::kNameSize,
+ trace_event::MemoryAllocatorDump::kUnitsBytes,
+ size.second);
+ // TOOD(hajimehoshi): Detect which the shared memory comes from browser,
+ // renderer or GPU process.
+ // TODO(hajimehoshi): Shared memory reported by GPU and discardable is
+ // currently double-counted. Add ownership edges to avoid this.
+ pmd->AddOwnershipEdge(local_dump->guid(), global_dump->guid());
+ }
+ return true;
+}
+
+SharedMemoryTracker::SharedMemoryTracker() {
+ trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
+ this, "SharedMemoryTracker", nullptr);
+}
+
+SharedMemoryTracker::~SharedMemoryTracker() = default;
+
+} // namespace
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