How does one know the number of processors in Linux?

LinuxHow to know the number of processors

 

LinuxPairSMPThe support is quite mature. In the configurationSMPRequiredMP specIn this article,LinuxHow to passMP specLearnCPUNumber.

Setup_arch ()-> get_smp_config ()->__ get_smp_config (0)-> check_physptr ()-> smp_read_nm()-> mp_processor_info ()-> generic_processor_info ()

mp_processor_info () traverse the MCM information table, each CPU On corresponds to one item in the information table. If the current table item is mp_processor , the function generic_processor_info () , this function adds num_processor 1 . Therefore, after the traversal, the system learns the number of processors in the system.