Re: waitqueues vs. wake_up_process

From: Ingo Molnar (
Date: Mon Aug 28 2000 - 05:20:18 EST

On Fri, 25 Aug 2000, Andrea Arcangeli wrote:

> Actually (test7) it's always good idea to use "wake_up_process()"
> instead of a waitqueue, if in the waitqueue there would be only 1 task
> at once.

no, it's not a good idea for the reason i described: 1) extensibility of
the code itself (you can easily change a waitqueue-based code to
multiple-threads, you cannot do it with the wake_up_process() variant) 2)
wake_up_process() is a scheduler-internal function and optimizations that
go into waitqueues will not necesserily show up in wake_up_process(). As
of 2.4.0-test7 you are right, but it's IMHO shortsighted.


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