kernel: default flexible memory to 448 MiB and charge loaded modules' segments to it

src/kernel/memory.cpp

@@ -67,7 +67,7 @@ constexpr uint64_t PAGE_TABLE_POOL_SIZE   = 4ull * 1024ull * 1024ull * 1024ull;
 constexpr uint64_t PAGE_TABLE_GRANULARITY = 2ull * 1024ull * 1024ull;
 constexpr int      PAGE_TABLE_POOL_ENTRIES =
     static_cast<int>(PAGE_TABLE_POOL_SIZE / PAGE_TABLE_GRANULARITY);
-constexpr uint64_t DEFAULT_FLEXIBLE_MEMORY_SIZE = 1ull * 1024ull * 1024ull * 1024ull;
+constexpr uint64_t DEFAULT_FLEXIBLE_MEMORY_SIZE = 448ull * 1024ull * 1024ull;
 
 static uint64_t                      g_flexible_memory_size        = DEFAULT_FLEXIBLE_MEMORY_SIZE;
 static bool                          g_flexible_memory_size_frozen = false;
@@ -738,6 +738,8 @@ public:
 
 	static uint64_t Size() { return g_flexible_memory_size; }
 	uint64_t        Available();
+	void            Charge(uint64_t size);
+	void            Release(uint64_t size);
 
 	bool Map(uint64_t vaddr, size_t len, int prot, VirtualMemory::Mode mode, GpuAccessMode gpu_mode,
 	         const char* name);
@@ -1967,6 +1969,19 @@ uint64_t FlexibleMemory::Available() {
 	return (Size() >= m_allocated_total ? Size() - m_allocated_total : 0);
 }
 
+void FlexibleMemory::Charge(uint64_t size) {
+	Common::LockGuard lock(m_mutex);
+
+	m_allocated_total += size;
+}
+
+void FlexibleMemory::Release(uint64_t size) {
+	Common::LockGuard lock(m_mutex);
+
+	EXIT_IF(size > m_allocated_total);
+	m_allocated_total -= size;
+}
+
 void PooledMemory::AddFreeUnlocked(uint64_t start, uint64_t size) {
 	if (size == 0) {
 		return;
@@ -3770,6 +3785,14 @@ uint64_t AllocateProgramMemory(uint64_t search_addr, uint64_t size, VirtualMemor
 	return AllocateGuestRuntimeMemory(search_addr, size, mode, name, VirtualRangeType::Code, false);
 }
 
+void ChargeFlexibleMemory(uint64_t size) {
+	g_flexible_memory->Charge(size);
+}
+
+void ReleaseFlexibleMemory(uint64_t size) {
+	g_flexible_memory->Release(size);
+}
+
 void SetProgramMemoryProtection(uint64_t vaddr, uint64_t size, VirtualMemory::Mode mode) {
 	std::lock_guard<std::recursive_mutex> memory_operation_lock(g_memory_operation_mutex);