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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 reviews Created 3 years, 11 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..a436bc5ca66439a04fb5475e1ab7a4abb66f28c0
--- /dev/null
+++ b/base/memory/shared_memory_tracker.cc
@@ -0,0 +1,82 @@
+// 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 {
+
+static const char* kSharedMemoryDumpName = "shared_memory";
Primiano Tucci (use gerrit) 2017/01/27 20:09:49 you use this only in one place. I'd just inline it
hajimehoshi 2017/02/07 12:33:44 Done.
+
+SharedMemoryTracker* SharedMemoryTracker::GetInstance() {
+ return base::Singleton<SharedMemoryTracker, base::LeakySingletonTraits<
+ SharedMemoryTracker>>::get();
+}
+
+bool SharedMemoryTracker::OnMemoryDump(
+ const base::trace_event::MemoryDumpArgs& args,
+ base::trace_event::ProcessMemoryDump* pmd) {
+ for (auto& bucket : buckets_) {
+ base::AutoLock lock(bucket.lock);
+ for (const auto& usage : bucket.usages) {
+ SharedMemory::Id id;
+ usage.first->GetUniqueId(&id);
danakj 2017/01/27 16:56:42 I think you need to consolidate these ids first cu
Primiano Tucci (use gerrit) 2017/01/27 20:09:49 Hmm interesting. I would have *not* expected that
hajimehoshi 2017/02/07 12:33:44 Hmm, I also didn't expect such situation like prim
hajimehoshi 2017/02/10 11:05:58 FYI: This happens when the ID is 0. fstat(3) fails
+ std::string dump_name = base::StringPrintf(
+ "%s/%lld.%lld", kSharedMemoryDumpName,
+ static_cast<long long>(id.first), static_cast<long long>(id.second));
+ auto guid = base::trace_event::MemoryAllocatorDumpGuid(dump_name);
+ base::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(base::trace_event::MemoryAllocatorDump::kNameSize,
+ base::trace_event::MemoryAllocatorDump::kUnitsBytes,
+ usage.second);
+ base::trace_event::MemoryAllocatorDump* global_dump =
+ pmd->CreateSharedGlobalAllocatorDump(guid);
+ global_dump->AddScalar(
+ base::trace_event::MemoryAllocatorDump::kNameSize,
+ base::trace_event::MemoryAllocatorDump::kUnitsBytes, usage.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;
+}
+
+bool SharedMemoryTracker::IncrementMemoryUsage(
+ const SharedMemory& shared_memory) {
+ int bucket = reinterpret_cast<uintptr_t>(&shared_memory) % kTrackerBucketNum;
+ base::AutoLock lock(buckets_[bucket].lock);
danakj 2017/01/27 16:56:42 nit: name the AutoLock |hold|. It's not a lock, it
hajimehoshi 2017/02/07 12:33:44 Done.
+ buckets_[bucket].usages[&shared_memory] = shared_memory.mapped_size();
+ return true;
+}
+
+bool SharedMemoryTracker::DecrementMemoryUsage(
+ const SharedMemory& shared_memory) {
+ int bucket = reinterpret_cast<uintptr_t>(&shared_memory) % kTrackerBucketNum;
+ base::AutoLock lock(buckets_[bucket].lock);
danakj 2017/01/27 16:56:42 same here
hajimehoshi 2017/02/07 12:33:44 Done.
+ buckets_[bucket].usages.erase(&shared_memory);
+ return true;
+}
+
+SharedMemoryTracker::SharedMemoryTracker() {
+ base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
+ this, "SharedMemoryTracker", nullptr);
+}
+
+SharedMemoryTracker::~SharedMemoryTracker() = default;
+
+SharedMemoryTracker::TrackerBucket::TrackerBucket() = default;
+
+SharedMemoryTracker::TrackerBucket::~TrackerBucket() = default;
+
+} // namespace
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