difference between set_cpus_allowed() and sched_setaffinity()
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the way i understand it is set_cpus_allowed() that is the concept of cpus_allowed
has been a long standing internal kernel space interface to cpu bitmask.
used by the scheduler in sched.c define in /linux/sched.h
the new syscall sched_setaffinity() is in <sched.c> not /linux/schedule.c
which implies it is to be used from user space i think.
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