Messages in this thread | | | Subject | Re: RCU question | From | Lee Revell <> | Date | Fri, 10 Dec 2004 15:45:31 -0500 |
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On Sat, 2004-12-11 at 02:10 +0530, Dipankar Sarma wrote: > On Fri, Dec 10, 2004 at 11:42:55AM -0800, George Anzinger wrote: > > Dipankar Sarma wrote: > > >And yes, RCU processing in softirq context can re-raise the softirq. > > >AFAICS, it is perfectly normal. > > > > My assumption was that, this being the idle task, RCU would be more than > > happy to finish all its pending tasks. > > We try to avoid really long running softirqs (RCU tasklet in this case) > for better scheduling latency. A long running rcu tasklet during > an idle cpu may delay running of an RT process that becomes runnable > during the rcu tasklet. >
Well, softirqs should really be preemptible if you care about RT task latency. Ingo's patches have had this for months. Works great. Maybe it's time to push it upstream.
Lee
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