Kernel: Add physical memory info to /proc/{pid}/meminfo

kernel/include/kernel/Memory/FileBackedRegion.h

@@ -26,10 +26,11 @@ namespace Kernel
 		static BAN::ErrorOr<BAN::UniqPtr<FileBackedRegion>> create(BAN::RefPtr<Inode>, PageTable&, off_t offset, size_t size, AddressRange address_range, Type, PageTable::flags_t);
 		~FileBackedRegion();
 
-		virtual BAN::ErrorOr<bool> allocate_page_containing(vaddr_t vaddr) override;
-
 		virtual BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> clone(PageTable& new_page_table) override;
 
+	protected:
+		virtual BAN::ErrorOr<bool> allocate_page_containing_impl(vaddr_t vaddr) override;
+
 	private:
 		FileBackedRegion(BAN::RefPtr<Inode>, PageTable&, off_t offset, ssize_t size, Type flags, PageTable::flags_t page_flags);
 

kernel/include/kernel/Memory/MemoryBackedRegion.h

@@ -14,7 +14,6 @@ namespace Kernel
 		static BAN::ErrorOr<BAN::UniqPtr<MemoryBackedRegion>> create(PageTable&, size_t size, AddressRange, Type, PageTable::flags_t);
 		~MemoryBackedRegion();
 
-		virtual BAN::ErrorOr<bool> allocate_page_containing(vaddr_t vaddr) override;
 
 		virtual BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> clone(PageTable& new_page_table) override;
 
@@ -22,6 +21,9 @@ namespace Kernel
 		// This can fail if no memory is mapped and no free memory was available
 		BAN::ErrorOr<void> copy_data_to_region(size_t offset_into_region, const uint8_t* buffer, size_t buffer_size);
 
+	protected:
+		virtual BAN::ErrorOr<bool> allocate_page_containing_impl(vaddr_t vaddr) override;
+
 	private:
 		MemoryBackedRegion(PageTable&, size_t size, Type, PageTable::flags_t);
 	};

kernel/include/kernel/Memory/MemoryRegion.h

@@ -38,11 +38,12 @@ namespace Kernel
 		vaddr_t vaddr() const { return m_vaddr; }
 
 		size_t virtual_page_count() const { return BAN::Math::div_round_up<size_t>(m_size, PAGE_SIZE); }
+		size_t physical_page_count() const { return m_physical_page_count; }
 
 		// Returns error if no memory was available
 		// Returns true if page was succesfully allocated
 		// Returns false if page was already allocated
-		virtual BAN::ErrorOr<bool> allocate_page_containing(vaddr_t address) = 0;
+		BAN::ErrorOr<bool> allocate_page_containing(vaddr_t address);
 
 		virtual BAN::ErrorOr<BAN::UniqPtr<MemoryRegion>> clone(PageTable& new_page_table) = 0;
 	
@@ -50,12 +51,15 @@ namespace Kernel
 		MemoryRegion(PageTable&, size_t size, Type type, PageTable::flags_t flags);
 		BAN::ErrorOr<void> initialize(AddressRange);
 
+		virtual BAN::ErrorOr<bool> allocate_page_containing_impl(vaddr_t address) = 0;
+
 	protected:
 		PageTable& m_page_table;
 		const size_t m_size;
 		const Type m_type;
 		const PageTable::flags_t m_flags;
 		vaddr_t m_vaddr { 0 };
+		size_t m_physical_page_count { 0 };
 	};
 
 }

kernel/include/kernel/Thread.h

@@ -84,6 +84,7 @@ namespace Kernel
 		bool is_userspace() const { return m_is_userspace; }
 
 		size_t virtual_page_count() const { return m_stack->size() / PAGE_SIZE; }
+		size_t physical_page_count() const { return virtual_page_count(); }
 
 #if __enable_sse
 		void save_sse() { asm volatile("fxsave %0" :: "m"(m_sse_storage)); }

kernel/kernel/Memory/FileBackedRegion.cpp

@@ -85,7 +85,7 @@ namespace Kernel
 		}
 	}
 
-	BAN::ErrorOr<bool> FileBackedRegion::allocate_page_containing(vaddr_t address)
+	BAN::ErrorOr<bool> FileBackedRegion::allocate_page_containing_impl(vaddr_t address)
 	{
 		ASSERT(contains(address));
 

kernel/kernel/Memory/MemoryBackedRegion.cpp

@@ -38,7 +38,7 @@ namespace Kernel
 		}
 	}
 
-	BAN::ErrorOr<bool> MemoryBackedRegion::allocate_page_containing(vaddr_t address)
+	BAN::ErrorOr<bool> MemoryBackedRegion::allocate_page_containing_impl(vaddr_t address)
 	{
 		ASSERT(m_type == Type::PRIVATE);
 

kernel/kernel/Memory/MemoryRegion.cpp

@@ -47,4 +47,12 @@ namespace Kernel
 		return true;
 	}
 
+	BAN::ErrorOr<bool> MemoryRegion::allocate_page_containing(vaddr_t address)
+	{
+		auto ret = allocate_page_containing_impl(address);
+		if (!ret.is_error() && ret.value())
+			m_physical_page_count++;
+		return ret;
+	}
+
 }

kernel/kernel/Process.cpp

@@ -257,14 +257,24 @@ namespace Kernel
 		LockGuard _(m_lock);
 
 		out->page_size = PAGE_SIZE;
-
 		out->virt_pages = 0;
+		out->phys_pages = 0;
+
 		for (auto* thread : m_threads)
+		{
 			out->virt_pages += thread->virtual_page_count();
+			out->phys_pages += thread->physical_page_count();
+		}
 		for (auto& region : m_mapped_regions)
+		{
 			out->virt_pages += region->virtual_page_count();
+			out->phys_pages += region->physical_page_count();
+		}
 		if (m_loadable_elf)
+		{
 			out->virt_pages += m_loadable_elf->virtual_page_count();
+			out->phys_pages += m_loadable_elf->physical_page_count();
+		}
 	}
 
 	BAN::ErrorOr<long> Process::sys_exit(int status)