Information about some task_t members

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Hello,

could you give me some information about these members of the
task_struct structure in sched.h? What do they mean? I have written down
what I do understand ... hope you can give me some help. Kernel reading
isn't that easy, there are so less comments... 

sleep_avg
it has something to do with how long a task sleeps...?!

timestamp
timestamp, but what should it indicate?

last_ran
time when the task has last run

sched_time
perhaps the time when this task was last scheduled...?

time_slice
length of a time slice? 

ncvsw
the number of voluntary context switches...

nivcsw
the number of involuntary context switches...

Thanks in advance!
Andreas 

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