linux-kernel - Re: [RFT][PATCH] sched, cgroup: Optimize load_balance

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Message-ID: <1310590863.2586.37.camel@twins>
Date:	Wed, 13 Jul 2011 23:01:03 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Paul Turner <pjt@...gle.com>
Cc:	Nikhil Rao <ncrao@...gle.com>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	linux-kernel <linux-kernel@...r.kernel.org>,
	Ingo Molnar <mingo@...e.hu>, Mike Galbraith <efault@....de>
Subject: Re: [RFT][PATCH] sched, cgroup: Optimize load_balance_fair()

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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