Re: [RFT][PATCH] sched, cgroup: Optimize load_balance_fair()

[Peter Zijlstra]

On Wed, 2011-07-13 at 10:13 -0700, Paul Turner wrote:
> > +static void update_h_load(long cpu)
> > +{
> > +       walk_tg_tree(tg_load_down, tg_nop, (void *)cpu);
> > +}
> 
> With a list_for_each_entry_reverse_rcu() this could also only operate
> on the local hierarchy and avoid the tg tree walk. 

Ah, sadly that primitive cannot exist, rcu list primitives only keeps
the fwd link.

Although I guess we could 'fix' that.
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