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On Mon, Oct 17, 2005 at 06:01:31PM +0200, Eric Dumazet wrote: > Linus Torvalds a écrit : > > >> > - post-14: work on making sure rcu callbacks are done in a more timely > > manner when the rcu queue gets long. This would involve TIF_RCUPENDING > > and whatever else to make sure that we have timely quiescent periods, > > and we do the RCU callback tasklet more often if the queue is long. > > > > Absolutely. Keeping a count of (percpu) queued items is basically free if > kept in the cache line used by list head, so the 'queue length on this cpu' > is a cheap metric. Or 'sudden increase in queue length on this cpu' :) > A 'realtime refinement' would be to use a different maxbatch limit > depending on the caller's priority : Let a softirq thread have a lower > batch count than a regular user thread. Yes, would be interesting. Thanks Dipankar - 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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