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* Miklos Szeredi <miklos@szeredi.hu> 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 - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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