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Just to clarify my problems: For each KVM virtual machine, it is actually a process running on the host. The $pid in "/proc/$pid/io" represents the VM process’s PID. All my work is done on the host, not inside the VMs. Take the VM process’s pid is “pid”, What the /proc/$pid/io records is io statistics of the VM from the host’s perspective. I understand that qemu might do some I/O