Is tasklets or workqueues or softirqs are scheduled by the
scheduler?
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Answer Posted / bharat bhushan
I do not think writing answer no is appropriate. Just
justification is needed.
There are three context in linux kernel. Process, Bottom
Half and interrupt. BH as literally is deferred in linux
2.5.??. Read Robert Love, Linux Kernel Development Ch 7.
BH can be one out of these. { Softirqs, Tasklets,
Workqueues}. We can schedule if something/someone goes to
sleep. That is how linux scheduler gets invoked. As you
know{?), interrupt (1st half), Softirq does not go to sleep.
So it is not right to say, we can schedule from Interrupt
Context. New implementation like Workqueues can go to sleep.
So, here we can schedule.
What about tasklets?
Tasklets runs as softirq ( I think SOFTIRQ_TASKLET_HI and
SOFTIRQ_TASKLET_??), so can not sleep.
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