write_bm_pid_to_resctrl
ret = write_bm_pid_to_resctrl(bm_pid, param->ctrlgrp, param->mongrp);
int write_bm_pid_to_resctrl(pid_t bm_pid, const char *ctrlgrp, const char *mongrp);
ret = write_bm_pid_to_resctrl(ppid, param->ctrlgrp, param->mongrp);