Function get_device_memory_commitment 

pub unsafe fn get_device_memory_commitment(
    device: &Device,
    memory: DeviceMemory,
    committed_memory_in_bytes: &mut DeviceSize,
) -> Result<(), CallError>

Call vkGetDeviceMemoryCommitment using this context’s cached function pointer.

Errors

Reports a missing command, invalid slice lengths/counts or a native error.

Safety

The context and all handles must be live and belong to the same Vulkan implementation/device. Meet vkGetDeviceMemoryCommitment valid usage, enabled API/extension/feature, pointer-chain lifetime, callback compatibility and host/GPU synchronization requirements. Native resources require explicit destruction after completion.

Khronos reference: vkGetDeviceMemoryCommitment