/dev/cpu_dma_latency
时间: 2023-10-10 09:09:14 浏览: 66
/dev/cpu_dma_latency is a special file in the Linux kernel that allows a process to block its execution until a DMA transfer is complete. DMA stands for Direct Memory Access, which is a method of allowing devices to access system memory without going through the CPU. This can improve performance by reducing the CPU's workload, but it can also cause problems if the CPU needs to access memory while a DMA transfer is in progress.
By writing to /dev/cpu_dma_latency, a process can request that the CPU be put into a low-power state until the DMA transfer is complete. This can help reduce power consumption and improve performance in certain situations. However, using this feature requires careful consideration and testing, as it can cause unexpected behavior in some systems.