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6f38ce8f47
This avoids allocations in the VMObject constructor. The number of inline elements was determined empirically and covers most common cases including LibC malloc.
92 lines
2.5 KiB
C++
92 lines
2.5 KiB
C++
/*
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* Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/HashTable.h>
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#include <AK/IntrusiveList.h>
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#include <AK/RefCounted.h>
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#include <AK/RefPtr.h>
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#include <AK/Vector.h>
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#include <AK/Weakable.h>
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#include <Kernel/Lock.h>
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namespace Kernel {
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class Inode;
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class PhysicalPage;
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class VMObjectDeletedHandler {
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public:
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virtual ~VMObjectDeletedHandler() = default;
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virtual void vmobject_deleted(VMObject&) = 0;
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};
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class VMObject : public RefCounted<VMObject>
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, public Weakable<VMObject> {
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friend class MemoryManager;
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friend class Region;
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public:
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virtual ~VMObject();
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virtual RefPtr<VMObject> clone() = 0;
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virtual bool is_anonymous() const { return false; }
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virtual bool is_inode() const { return false; }
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virtual bool is_shared_inode() const { return false; }
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virtual bool is_private_inode() const { return false; }
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virtual bool is_contiguous() const { return false; }
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size_t page_count() const { return m_physical_pages.size(); }
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const Vector<RefPtr<PhysicalPage>, 16>& physical_pages() const { return m_physical_pages; }
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Vector<RefPtr<PhysicalPage>, 16>& physical_pages() { return m_physical_pages; }
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size_t size() const { return m_physical_pages.size() * PAGE_SIZE; }
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virtual const char* class_name() const = 0;
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ALWAYS_INLINE void ref_region() { m_regions_count++; }
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ALWAYS_INLINE void unref_region() { m_regions_count--; }
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ALWAYS_INLINE bool is_shared_by_multiple_regions() const { return m_regions_count > 1; }
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void register_on_deleted_handler(VMObjectDeletedHandler& handler)
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{
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m_on_deleted.set(&handler);
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}
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void unregister_on_deleted_handler(VMObjectDeletedHandler& handler)
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{
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m_on_deleted.remove(&handler);
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}
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protected:
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VMObject();
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explicit VMObject(size_t);
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explicit VMObject(const VMObject&);
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template<typename Callback>
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void for_each_region(Callback);
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IntrusiveListNode<VMObject> m_list_node;
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Vector<RefPtr<PhysicalPage>, 16> m_physical_pages;
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Lock m_paging_lock { "VMObject" };
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mutable SpinLock<u8> m_lock;
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private:
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VMObject& operator=(const VMObject&) = delete;
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VMObject& operator=(VMObject&&) = delete;
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VMObject(VMObject&&) = delete;
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Atomic<u32, AK::MemoryOrder::memory_order_relaxed> m_regions_count { 0 };
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HashTable<VMObjectDeletedHandler*> m_on_deleted;
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SpinLock<u8> m_on_deleted_lock;
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public:
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using List = IntrusiveList<VMObject, RawPtr<VMObject>, &VMObject::m_list_node>;
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};
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}
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