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   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_DISCARDABLE_MEMORY_CLIENT_CLIENT_DISCARDABLE_SHARED_MEMORY_MANAGER_H_
   6 #define COMPONENTS_DISCARDABLE_MEMORY_CLIENT_CLIENT_DISCARDABLE_SHARED_MEMORY_MANAGER_H_
   7
   8 #include <stddef.h>
   9
  10 #include "base/macros.h"
  11 #include "base/memory/discardable_memory_allocator.h"
  12 #include "base/memory/ref_counted.h"
  13 #include "base/memory/shared_memory_handle.h"
  14 #include "base/synchronization/lock.h"
  15 #include "base/trace_event/memory_dump_provider.h"
  16 #include "components/discardable_memory/common/discardable_memory_export.h"
  17 #include "components/discardable_memory/common/discardable_shared_memory_heap.h"
  18 #include "components/discardable_memory/common/discardable_shared_memory_id.h"
  19
  20 namespace discardable_memory {
  21
  22 // Implementation of DiscardableMemoryAllocator that allocates
  23 // discardable memory segments through the browser process.
  24 class DISCARDABLE_MEMORY_EXPORT ClientDiscardableSharedMemoryManager
  25     : public base::DiscardableMemoryAllocator,
  26       public base::trace_event::MemoryDumpProvider {
  27  public:
  28   class Delegate {
  29    public:
  30     virtual void AllocateLockedDiscardableSharedMemory(
  31         size_t size,
  32         DiscardableSharedMemoryId id,
  33         base::SharedMemoryHandle* handle) = 0;
  34     virtual void DeletedDiscardableSharedMemory(
  35         DiscardableSharedMemoryId id) = 0;
  36
  37    protected:
  38     virtual ~Delegate() {}
  39   };
  40
  41   explicit ClientDiscardableSharedMemoryManager(Delegate* delegate);
  42   ~ClientDiscardableSharedMemoryManager() override;
  43
  44   // Overridden from base::DiscardableMemoryAllocator:
  45   std::unique_ptr<base::DiscardableMemory> AllocateLockedDiscardableMemory(
  46       size_t size) override;
  47
  48   // Overridden from base::trace_event::MemoryDumpProvider:
  49   bool OnMemoryDump(const base::trace_event::MemoryDumpArgs& args,
  50                     base::trace_event::ProcessMemoryDump* pmd) override;
  51
  52   // Release memory and associated resources that have been purged.
  53   void ReleaseFreeMemory();
  54
  55   bool LockSpan(DiscardableSharedMemoryHeap::Span* span);
  56   void UnlockSpan(DiscardableSharedMemoryHeap::Span* span);
  57   void ReleaseSpan(std::unique_ptr<DiscardableSharedMemoryHeap::Span> span);
  58
  59   base::trace_event::MemoryAllocatorDump* CreateMemoryAllocatorDump(
  60       DiscardableSharedMemoryHeap::Span* span,
  61       const char* name,
  62       base::trace_event::ProcessMemoryDump* pmd) const;
  63
  64   struct Statistics {
  65     size_t total_size;
  66     size_t freelist_size;
  67   };
  68
  69   Statistics GetStatistics() const;
  70
  71  private:
  72   std::unique_ptr<base::DiscardableSharedMemory>
  73   AllocateLockedDiscardableSharedMemory(size_t size,
  74                                         DiscardableSharedMemoryId id);
  75   void MemoryUsageChanged(size_t new_bytes_allocated,
  76                           size_t new_bytes_free) const;
  77
  78   mutable base::Lock lock_;
  79   DiscardableSharedMemoryHeap heap_;
  80   Delegate* const delegate_;
  81
  82   DISALLOW_COPY_AND_ASSIGN(ClientDiscardableSharedMemoryManager);
  83 };
  84
  85 }  // namespace discardable_memory
  86
  87 #endif  // COMPONENTS_DISCARDABLE_MEMORY_CLIENT_CLIENT_DISCARDABLE_SHARED_MEMORY_MANAGER_H_