sa_cmp
RB_PROTOTYPE(iked_sas, iked_sa, sa_entry, sa_cmp);
RB_GENERATE(iked_sas, iked_sa, sa_entry, sa_cmp);
sa_cmp(struct iked_sa *, struct iked_sa *);
extern cmpf_t sa_cmp;
sa_cmp = cmp_dkio;
sa_cmp = cmp_avgcpumem;
sa_cmp = cmp_cpumem;
sa_cmp = cmp_calls;
cmpf_t sa_cmp = cmp_usrsys;
sa_cmp = cmp_avgusrsys;
sa_cmp = cmp_avgdkio;
bti.compare = sa_cmp;