Re: route cache DoS testing and softirqs
From: Andrea Arcangeli
Date: Wed Mar 31 2004 - 17:08:54 EST
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
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.
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