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Kernel: Allocate kernel stacks for threads using the region allocator.

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This patch moves away from using kmalloc memory for thread kernel stacks.
This reduces pressure on kmalloc (16 KB per thread adds up fast) and
prevents kernel stack overflow from scribbling all over random unrelated
kernel memory.
This commit is contained in:
Andreas Kling 2019-05-14 11:51:00 +02:00
parent 8c3ad802d8
commit c8a216b107
6 changed files with 65 additions and 24 deletions
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7
Kernel/VM/MemoryManager.h
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@ -68,6 +68,9 @@ public:
void map_for_kernel(LinearAddress, PhysicalAddress);
RetainPtr<Region> allocate_kernel_region(size_t, String&& name);
void map_region_at_address(PageDirectory&, Region&, LinearAddress, bool user_accessible);
private:
MemoryManager();
~MemoryManager();
@ -77,7 +80,6 @@ private:
void register_region(Region&);
void unregister_region(Region&);
void map_region_at_address(PageDirectory&, Region&, LinearAddress, bool user_accessible);
void remap_region_page(Region&, unsigned page_index_in_region, bool user_allowed);
void initialize_paging();
@ -211,7 +213,8 @@ private:
Vector<Retained<PhysicalPage>> m_free_supervisor_physical_pages;
HashTable<VMObject*> m_vmos;
HashTable<Region*> m_regions;
HashTable<Region*> m_user_regions;
HashTable<Region*> m_kernel_regions;
size_t m_ram_size { 0 };
bool m_quickmap_in_use { false };