Move discardable memory to //components from //content

components/discardable_memory/client/child_discardable_shared_memory_manager.cc

 // Copyright 2014 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 "content/child/child_discardable_shared_memory_manager.h"
+#include "components/discardable_memory/client/child_discardable_shared_memory_manager.h"
 
 #include <inttypes.h>
 
 #include <algorithm>
 #include <utility>
 
 #include "base/atomic_sequence_num.h"
 #include "base/bind.h"
 #include "base/debug/crash_logging.h"
 #include "base/macros.h"
 #include "base/memory/discardable_memory.h"
 #include "base/memory/discardable_shared_memory.h"
 #include "base/memory/ptr_util.h"
 #include "base/metrics/histogram_macros.h"
 #include "base/process/memory.h"
 #include "base/process/process_metrics.h"
 #include "base/strings/string_number_conversions.h"
 #include "base/strings/stringprintf.h"
 #include "base/threading/thread_task_runner_handle.h"
 #include "base/trace_event/memory_dump_manager.h"
 #include "base/trace_event/trace_event.h"
-#include "content/common/child_process_messages.h"
 
-namespace content {
+namespace discardable_memory {
 namespace {
 
 // Default allocation size.
 const size_t kAllocationSize = 4 * 1024 * 1024;
 
 // Global atomic to generate unique discardable shared memory IDs.
 base::StaticAtomicSequenceNumber g_next_discardable_shared_memory_id;
 
 class DiscardableMemoryImpl : public base::DiscardableMemory {
  public:
@@ skipping 37 matching lines @@
 
  private:
   ChildDiscardableSharedMemoryManager* const manager_;
   std::unique_ptr<DiscardableSharedMemoryHeap::Span> span_;
   bool is_locked_;
 
   DISALLOW_COPY_AND_ASSIGN(DiscardableMemoryImpl);
 };
 
 void SendDeletedDiscardableSharedMemoryMessage(
-    scoped_refptr<ThreadSafeSender> sender,
+    ChildDiscardableSharedMemoryManager::Delegate* delegate,
     DiscardableSharedMemoryId id) {
-  sender->Send(new ChildProcessHostMsg_DeletedDiscardableSharedMemory(id));
+  delegate->DeletedDiscardableSharedMemory(id);
 }
 
 }  // namespace
 
 ChildDiscardableSharedMemoryManager::ChildDiscardableSharedMemoryManager(
-    ThreadSafeSender* sender)
-    : heap_(base::GetPageSize()), sender_(sender) {
+    Delegate* delegate)
+    : heap_(base::GetPageSize()), delegate_(delegate) {
   base::trace_event::MemoryDumpManager::GetInstance()->RegisterDumpProvider(
       this, "ChildDiscardableSharedMemoryManager",
       base::ThreadTaskRunnerHandle::Get());
 }
 
 ChildDiscardableSharedMemoryManager::~ChildDiscardableSharedMemoryManager() {
   base::trace_event::MemoryDumpManager::GetInstance()->UnregisterDumpProvider(
       this);
   // TODO(reveman): Determine if this DCHECK can be enabled. crbug.com/430533
   // DCHECK_EQ(heap_.GetSize(), heap_.GetSizeOfFreeLists());
   if (heap_.GetSize())
     MemoryUsageChanged(0, 0);
 }
 
 std::unique_ptr<base::DiscardableMemory>
 ChildDiscardableSharedMemoryManager::AllocateLockedDiscardableMemory(
     size_t size) {
   base::AutoLock lock(lock_);
 
   DCHECK_NE(size, 0u);
 
+  auto size_in_kb = static_cast<base::HistogramBase::Sample>(size / 1024);
   UMA_HISTOGRAM_CUSTOM_COUNTS("Memory.DiscardableAllocationSize",
-                              size / 1024,  // In KB
+                              size_in_kb,  // In KB
                               1,
                               4 * 1024 * 1024,  // 4 GB
                               50);
 
   // Round up to multiple of page size.
   size_t pages =
       std::max((size + base::GetPageSize() - 1) / base::GetPageSize(),
                static_cast<size_t>(1));
 
   // Default allocation size in pages.
@@ skipping 52 matching lines @@
   size_t allocation_size_in_bytes = pages_to_allocate * base::GetPageSize();
 
   DiscardableSharedMemoryId new_id =
       g_next_discardable_shared_memory_id.GetNext();
 
   // Ask parent process to allocate a new discardable shared memory segment.
   std::unique_ptr<base::DiscardableSharedMemory> shared_memory(
       AllocateLockedDiscardableSharedMemory(allocation_size_in_bytes, new_id));
 
   // Create span for allocated memory.
-  std::unique_ptr<DiscardableSharedMemoryHeap::Span> new_span(heap_.Grow(
-      std::move(shared_memory), allocation_size_in_bytes, new_id,
-      base::Bind(&SendDeletedDiscardableSharedMemoryMessage, sender_, new_id)));
+  std::unique_ptr<DiscardableSharedMemoryHeap::Span> new_span(
+      heap_.Grow(std::move(shared_memory), allocation_size_in_bytes, new_id,
+                 base::Bind(&SendDeletedDiscardableSharedMemoryMessage,
+                            delegate_, new_id)));
   new_span->set_is_locked(true);
 
   // Unlock and insert any left over memory into free lists.
   if (pages < pages_to_allocate) {
     std::unique_ptr<DiscardableSharedMemoryHeap::Span> leftover =
         heap_.Split(new_span.get(), pages);
     leftover->shared_memory()->Unlock(
         leftover->start() * base::GetPageSize() -
             reinterpret_cast<size_t>(leftover->shared_memory()->memory()),
         leftover->length() * base::GetPageSize());
@@ skipping 53 matching lines @@
 }
 
 bool ChildDiscardableSharedMemoryManager::LockSpan(
     DiscardableSharedMemoryHeap::Span* span) {
   base::AutoLock lock(lock_);
 
   if (!span->shared_memory())
     return false;
 
   size_t offset = span->start() * base::GetPageSize() -
-      reinterpret_cast<size_t>(span->shared_memory()->memory());
+                  reinterpret_cast<size_t>(span->shared_memory()->memory());
   size_t length = span->length() * base::GetPageSize();
 
   switch (span->shared_memory()->Lock(offset, length)) {
     case base::DiscardableSharedMemory::SUCCESS:
       span->set_is_locked(true);
       return true;
     case base::DiscardableSharedMemory::PURGED:
       span->shared_memory()->Unlock(offset, length);
       span->set_is_locked(false);
       return false;
     case base::DiscardableSharedMemory::FAILED:
       return false;
   }
 
   NOTREACHED();
   return false;
 }
 
 void ChildDiscardableSharedMemoryManager::UnlockSpan(
     DiscardableSharedMemoryHeap::Span* span) {
   base::AutoLock lock(lock_);
 
   DCHECK(span->shared_memory());
   size_t offset = span->start() * base::GetPageSize() -
-      reinterpret_cast<size_t>(span->shared_memory()->memory());
+                  reinterpret_cast<size_t>(span->shared_memory()->memory());
   size_t length = span->length() * base::GetPageSize();
 
   span->set_is_locked(false);
   return span->shared_memory()->Unlock(offset, length);
 }
 
 void ChildDiscardableSharedMemoryManager::ReleaseSpan(
     std::unique_ptr<DiscardableSharedMemoryHeap::Span> span) {
   base::AutoLock lock(lock_);
 
@@ skipping 19 matching lines @@
 std::unique_ptr<base::DiscardableSharedMemory>
 ChildDiscardableSharedMemoryManager::AllocateLockedDiscardableSharedMemory(
     size_t size,
     DiscardableSharedMemoryId id) {
   TRACE_EVENT2("renderer",
                "ChildDiscardableSharedMemoryManager::"
                "AllocateLockedDiscardableSharedMemory",
                "size", size, "id", id);
 
   base::SharedMemoryHandle handle = base::SharedMemory::NULLHandle();
-  sender_->Send(
-      new ChildProcessHostMsg_SyncAllocateLockedDiscardableSharedMemory(
-          size, id, &handle));
+  delegate_->AllocateLockedDiscardableSharedMemory(size, id, &handle);
   std::unique_ptr<base::DiscardableSharedMemory> memory(
       new base::DiscardableSharedMemory(handle));
   if (!memory->Map(size))
     base::TerminateBecauseOutOfMemory(size);
   return memory;
 }
 
 void ChildDiscardableSharedMemoryManager::MemoryUsageChanged(
     size_t new_bytes_total,
     size_t new_bytes_free) const {
   static const char kDiscardableMemoryAllocatedKey[] =
       "discardable-memory-allocated";
   base::debug::SetCrashKeyValue(kDiscardableMemoryAllocatedKey,
                                 base::Uint64ToString(new_bytes_total));
 
   static const char kDiscardableMemoryFreeKey[] = "discardable-memory-free";
   base::debug::SetCrashKeyValue(kDiscardableMemoryFreeKey,
                                 base::Uint64ToString(new_bytes_free));
 }
 
-}  // namespace content
+}  // namespace discardable_memory