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是吗:
刚刚检查了代码。它测量从向设备发出请求到完成的时间。根据传递的参数,它从 blk_account_io_star() 函数开始测量,该函数在内核中首次排队时跟踪请求,或者默认选项是从 blk_start_request() 函数开始测量,该函数跟踪磁盘 I/O 发出的时间。