thread scheduling

[Soroosh R]

hello,
I'm new to freeBSD. I wanted to change the strategy of thread scheduling in freeBSD according to an extra variable added to sched_ule.c but now I don't know which file should be modified to choose thread with highest priority according to new strategy. both "tdq_runq_add" function in sys/kern/sched_ule.c and "runq_choose" function in sys/kern/kern_switch.c are responsible for this job according to their documentation but what is the difference between them and which one should be modified?
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the attached .c file contains both functions.
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