From: Peter Zijlstra <peterz@infradead.org>
To: Paul Turner <pjt@google.com>
Cc: Nikhil Rao <ncrao@google.com>,
Srivatsa Vaddagiri <vatsa@linux.vnet.ibm.com>,
linux-kernel <linux-kernel@vger.kernel.org>,
Ingo Molnar <mingo@elte.hu>, Mike Galbraith <efault@gmx.de>
Subject: Re: [RFT][PATCH] sched, cgroup: Optimize load_balance_fair()
Date: Wed, 13 Jul 2011 23:01:03 +0200 [thread overview]
Message-ID: <1310590863.2586.37.camel@twins> (raw)
In-Reply-To: <CAPM31R+cS+eRaFHa2ygxF3ADYyo5Tf9R+snky3U8b5_am6Wtjg@mail.gmail.com>
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.
next prev parent reply other threads:[~2011-07-13 21:01 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-13 11:36 [RFT][PATCH] sched, cgroup: Optimize load_balance_fair() Peter Zijlstra
2011-07-13 17:13 ` Paul Turner
2011-07-13 21:01 ` Peter Zijlstra [this message]
2011-07-14 0:46 ` Paul E. McKenney
2011-07-13 21:02 ` Peter Zijlstra
2011-07-13 21:14 ` Paul Turner
2011-07-13 21:18 ` Peter Zijlstra
2011-07-21 18:28 ` [tip:sched/core] " tip-bot for Peter Zijlstra
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