Messages in this thread | | | Date | Mon, 17 Oct 2005 21:53:26 +0530 | From | Dipankar Sarma <> | Subject | Re: VFS: file-max limit 50044 reached |
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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.
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