On Thu, Dec 20, 2001 at 11:13:27AM -0800, Peter Wemm wrote:
...
> Excellent catch! This particular problem was one of the main reasons
> why this is still defaulting to 'off'. I have a couple of other changes
> to it pending commit to fix some of Bruce's complaints, but I hadn't
> noticed the cause of this.
>
> Part of the problem is that tsleep temporarily elevates the priority for
> wakeup, and it is normally returned back to "normal" level when the process
> returns to userland (see the *_userpri stuff).
ah, ok, kernel threads never return to userland...
so, i presume one should also make sure that after the process is
scheduled, the priority is restored to the 'native' level; this
should also solve the problem with the priority propagation mechanism
(though... I have the feeling that if you have nested locks, this
cannot scale...)
cheers
luigi
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