dqn: Only poison commit pages to speed up poison of large arenas
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@ -232,11 +232,15 @@ DQN_API Dqn_MemBlock *Dqn_MemBlock_Init(Dqn_usize reserve, Dqn_usize commit, uin
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result->commit = commit_aligned - metadata_size;
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result->flags = DQN_CAST(uint8_t)flags;
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if (DQN_ASAN_POISON) { // NOTE: Poison (guard page + entire block), we unpoison as we allocate
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// NOTE: Poison (guard page + commit). We do *not* poison the entire
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// block, only the commit pages. Since we may reserve large amounts of
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// space vs commit we'd waste time marking those pages as poisoned as
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// reads or writes outside of committed pages will page fault.
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if (DQN_ASAN_POISON) {
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DQN_ASSERT(Dqn_IsPowerOfTwoAligned(result->data, DQN_ASAN_POISON_ALIGNMENT));
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DQN_ASSERT(Dqn_IsPowerOfTwoAligned(result->size, DQN_ASAN_POISON_ALIGNMENT));
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void *poison_ptr = DQN_CAST(void *)Dqn_AlignUpPowerOfTwo(DQN_CAST(char *)result + sizeof(Dqn_MemBlock), DQN_ASAN_POISON_ALIGNMENT);
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Dqn_usize bytes_to_poison = DQN_ASAN_POISON_GUARD_SIZE + result->size;
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Dqn_usize bytes_to_poison = DQN_ASAN_POISON_GUARD_SIZE + result->commit;
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Dqn_ASAN_PoisonMemoryRegion(poison_ptr, bytes_to_poison);
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}
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}
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@ -274,6 +278,12 @@ DQN_API void *Dqn_MemBlock_Alloc(Dqn_MemBlock *block, Dqn_usize size, uint8_t al
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block->commit += commit_size;
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Dqn_VMem_Commit(commit_ptr, commit_size, Dqn_VMemPage_ReadWrite);
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DQN_ASSERT(block->commit <= block->size);
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if (DQN_ASAN_POISON) { // NOTE: Poison newly committed pages that aren't being used.
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void *poison_ptr = DQN_CAST(char *)block->data + block->used;
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Dqn_usize bytes_to_poison = block->commit - block->used;
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Dqn_ASAN_PoisonMemoryRegion(poison_ptr, bytes_to_poison);
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}
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}
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return result;
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