> > That sysfs value itself will not change for the single system while the > kernel is running, but your program could be moved from a system with > one value for that file, to another system with a different value while > it is running without knowing that you were migrated. > Running process migration to another system? Wow, I never knew that. If migration happens between the time of reading /sys/devices/system/cpu/possible and the time of calling `bpf_lookup_elem`, TOCTOU(Time of check to Time of Use) problem would arise. HaHa. > So be careful here, and use the "normal" api to deal with cpu values and > numbers, never assume that once you start, that the number of cpus your > program has access to will not change. Thank you Kroah-Hartman for your advice. regards, Junyeong _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
