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Refactor the virtual memory object model a bit:

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Process now has a number of Regions.
Each Region is backed by a VMObject.
A VMObject can be file-backed or anonymous. These can be shared.
This commit is contained in:
Andreas Kling 2018-11-08 14:35:30 +01:00
parent 3c8064a787
commit 862f108cb5
6 changed files with 165 additions and 31 deletions
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46
Kernel/MemoryManager.h
View file

@ -57,10 +57,47 @@ struct PageDirectory {
RetainPtr<PhysicalPage> physical_pages[1024];
};
class VMObject : public Retainable<VMObject> {
public:
static RetainPtr<VMObject> create_file_backed(RetainPtr<VirtualFileSystem::Node>&&, size_t);
static RetainPtr<VMObject> create_anonymous(size_t);
RetainPtr<VMObject> clone();
~VMObject();
bool is_anonymous() const { return m_anonymous; }
VirtualFileSystem::Node* vnode() { return m_vnode.ptr(); }
const VirtualFileSystem::Node* vnode() const { return m_vnode.ptr(); }
size_t vnode_offset() const { return m_vnode_offset; }
String name() const { return m_name; }
void set_name(const String& name) { m_name = name; }
size_t page_count() const { return m_size / PAGE_SIZE; }
const Vector<RetainPtr<PhysicalPage>>& physical_pages() const { return m_physical_pages; }
Vector<RetainPtr<PhysicalPage>>& physical_pages() { return m_physical_pages; }
private:
VMObject(RetainPtr<VirtualFileSystem::Node>&&, size_t);
explicit VMObject(VMObject&);
explicit VMObject(size_t);
String m_name;
bool m_anonymous { false };
Unix::off_t m_vnode_offset { 0 };
size_t m_size { 0 };
RetainPtr<VirtualFileSystem::Node> m_vnode;
Vector<RetainPtr<PhysicalPage>> m_physical_pages;
};
struct Region : public Retainable<Region> {
Region(LinearAddress, size_t, Vector<RetainPtr<PhysicalPage>>, String&&, bool r, bool w, bool cow = false);
Region(LinearAddress, size_t, String&&, bool r, bool w, bool cow = false);
Region(LinearAddress, size_t, RetainPtr<VMObject>&&, String&&, bool r, bool w, bool cow = false);
Region(LinearAddress, size_t, RetainPtr<VirtualFileSystem::Node>&&, String&&, bool r, bool w);
~Region();
const VMObject& vmo() const { return *m_vmo; }
VMObject& vmo() { return *m_vmo; }
RetainPtr<Region> clone();
bool contains(LinearAddress laddr) const
{
@ -72,12 +109,12 @@ struct Region : public Retainable<Region> {
return (laddr - linearAddress).get() / PAGE_SIZE;
}
RetainPtr<VirtualFileSystem::Node> m_vnode;
Unix::off_t m_file_offset { 0 };
int commit(Process&);
int decommit(Process&);
LinearAddress linearAddress;
size_t size { 0 };
Vector<RetainPtr<PhysicalPage>> physical_pages;
RetainPtr<VMObject> m_vmo;
String name;
bool is_readable { true };
bool is_writable { true };
@ -89,6 +126,7 @@ struct Region : public Retainable<Region> {
class MemoryManager {
AK_MAKE_ETERNAL
friend class PhysicalPage;
friend class Region;
friend ByteBuffer procfs$mm();
public:
static MemoryManager& the() PURE;