Re: [2.4.17/18pre] VM and swap - it's really unusable

Roman Zippel
2002-01-12T11:53:46Z

Hi,

yodaiken@fsmlabs.com wrote:

> I believe that the preempt path leads inexorably to
> mutex-with-stupid-priority-trick and that would be very unfortunate indeed.
> It's unavoidable because sooner or later someone will find that preempt +
> SCHED_FIFO leads to
> niced app 1 in K mode gets Sem A
> SCHED_FIFO app prempts and blocks on Sem A
> whoops! app 2 in K more preempts niced app 1

Please explain what's different without the preempt patch.

> Hey my DVD player has stalled, lets add sem_with_revolting_priority_trick!
> Why the hell is UP Windows XP3 blowing away my Linux box on DVD playing while
> Linux now runs with the grace and speed of IRIX?

Because the IRIX implementation sucks, every implementation has to suck?
Somehow I have the suspicion you're trying to discourage everyone from
even trying, because if he'd succeeded you'd loose a big chunk of
potential RTLinux customers.

bye, Roman