Messages in this thread | | | Date | Wed, 31 Mar 2004 23:31:09 +0200 | From | Andrea Arcangeli <> | Subject | Re: route cache DoS testing and softirqs |
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On Thu, Apr 01, 2004 at 02:16:11AM +0530, Dipankar Sarma wrote: > I don't do any of this. I just have a separate quiescent state counter > for softirq RCU. It is incremented for regular quiescent points > like cswitch, userland, idle loop as well as at the completion > of each softirq handler. call_rcu_bh() uses its own queues. > Everything else works like call_rcu().
the point is that you want this counter to increase in every cpu quick, that's why I was thinking at posting the tasklet, if the counter doesn't increase from softirq, you fallback in the grace period length of the non-bh rcu.
maybe the softirq load is so high in all cpus that just the additional counter will fix it w/o having to post any additional tasklet (I very much hope so but especially with irq binding I don't see it happening, however with irq binding you may have a call_rcu_bh_cpuset). You should give it a try and see if it just works. - 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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