Re: [PATCH tip/core/rcu 07/23] rcu: Provide OOM handler to motivatelazy RCU callbacks

[Steven Rostedt]

On Thu, 2012-09-06 at 15:46 +0200, Peter Zijlstra wrote:
> On Thu, 2012-08-30 at 11:18 -0700, Paul E. McKenney wrote:
> > +       get_online_cpus();
> > +       for_each_online_cpu(cpu)
> > +               for_each_rcu_flavor(rsp)
> > +                       smp_call_function_single(cpu, rcu_oom_notify_cpu,
> > +                                                rsp, 1);
> > +       put_online_cpus(); 
> 
> I guess blasting IPIs around is better than OOM but still.. do you
> really need to wait for each cpu individually, or would a construct
> using on_each_cpu() be possible, or better yet, on_each_cpu_cond()?

Also, what about having the rcu_oom_notify_cpu handler do the
for_each_rcu_flavor() and not send an IPI multiple times to a single
CPU?

-- Steve


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