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SubjectRe: RCU question
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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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