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 |