Messages in this thread | | | Date | Thu, 1 Apr 2004 03:22:14 +0530 | From | Dipankar Sarma <> | Subject | Re: route cache DoS testing and softirqs |
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On Wed, Mar 31, 2004 at 11:31:09PM +0200, Andrea Arcangeli wrote: > 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.
Ah, forcing CPUs for quiescent state is my last WMD if I have to use it ever :)
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