which means these lines (CFS)

[Meyer Lansky]

 Hello everyone!

Learning scheduler CFS.
It was not clear a few lines of help -  http://lxr.free-electrons.com/source/kernel/sched/fair.c

Question: what means  granularity = 750000ULL; in line 91 - 
http://lxr.free-electrons.com/source/kernel/sched/fair.c#L91

and 

what means latency this line 50 -  http://lxr.free-electrons.com/source/kernel/sched/fair.c#L50


I ask because I rarely meet such words, and only while starting to learn the source code

Thank you all for your attention! 
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