AFAIK, each process has its own user address space. But how about the kernel address space? Does all the kernel address space of the processes in the same address space? Someone told me they were not. But I think if they were not , how could the data structures, such as "wait_queue", to be linked together? -- Wu Yu -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ