* Miklos Szeredi <[email protected]> wrote:
> > could you try the quick hack below, ontop of cfs-v17? It adds two
> > things to wait_task_inactive():
> >
> > - a cond_resched() [in case you are running !PREEMPT]
> >
> > - use MONITOR+MWAIT to monitor memory transactions to the rq->curr
> > cacheline. This should make the polling loop definitely fair.
>
> Is it not possible for the mwait to get stuck?
it is - when the other CPU does nothing.
> > If this solves the problem on your box then i'll do a proper fix and
> > introduce a cpu_relax_memory_change(*addr) type of API to around
> > monitor/mwait. This patch boots fine on my T60 - but i never saw
> > your problem.
>
> Yes, the patch does make the pauses go away. In fact just the
> smp_mb() seems to suffice.
cool! Could you send me the smallest patch you tried that still made the
hangs go away?
Ingo
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