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alloc_from_memory_block to commit amounts equal to multiples of the DEFAULT_PAGE_SIZE

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gingerBill
2023-08-15 15:12:12 +01:00
parent 2cc22d118d
commit 646c4c7458
1 changed files with 8 additions and 5 deletions
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core/mem/virtual/virtual.odin
+8 -5
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@@ -59,13 +59,14 @@ Memory_Block_Flag :: enum u32 {
Memory_Block_Flags :: distinct bit_set[Memory_Block_Flag; u32] Memory_Block_Flags :: distinct bit_set[Memory_Block_Flag; u32]
@(private="file", require_results)
align_formula :: #force_inline proc "contextless" (size, align: uint) -> uint {
result := size + align-1
return result - result%align
}
@(require_results) @(require_results)
memory_block_alloc :: proc(committed, reserved: uint, flags: Memory_Block_Flags) -> (block: ^Memory_Block, err: Allocator_Error) { memory_block_alloc :: proc(committed, reserved: uint, flags: Memory_Block_Flags) -> (block: ^Memory_Block, err: Allocator_Error) {
align_formula :: proc "contextless" (size, align: uint) -> uint {
result := size + align-1
return result - result%align
}
page_size := DEFAULT_PAGE_SIZE page_size := DEFAULT_PAGE_SIZE
assert(mem.is_power_of_two(uintptr(page_size))) assert(mem.is_power_of_two(uintptr(page_size)))
committed := committed committed := committed
@@ -120,6 +121,8 @@ alloc_from_memory_block :: proc(block: ^Memory_Block, min_size, alignment: uint)
pmblock := (^Platform_Memory_Block)(block) pmblock := (^Platform_Memory_Block)(block)
base_offset := uint(uintptr(pmblock.block.base) - uintptr(pmblock)) base_offset := uint(uintptr(pmblock.block.base) - uintptr(pmblock))
platform_total_commit := base_offset + block.used + size platform_total_commit := base_offset + block.used + size
platform_total_commit = align_formula(platform_total_commit, DEFAULT_PAGE_SIZE)
platform_total_commit = min(platform_total_commit, pmblock.reserved)
assert(pmblock.committed <= pmblock.reserved) assert(pmblock.committed <= pmblock.reserved)
assert(pmblock.committed < platform_total_commit) assert(pmblock.committed < platform_total_commit)