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
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