linux-kernel - Re: [PATCH 23/40] autonuma: sched_set_autonuma_need

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Date:	Sun, 01 Jul 2012 12:57:41 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Andrea Arcangeli <aarcange@...hat.com>
CC:	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Hillf Danton <dhillf@...il.com>, Dan Smith <danms@...ibm.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...e.hu>, Paul Turner <pjt@...gle.com>,
	Suresh Siddha <suresh.b.siddha@...el.com>,
	Mike Galbraith <efault@....de>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
	Lai Jiangshan <laijs@...fujitsu.com>,
	Bharata B Rao <bharata.rao@...il.com>,
	Lee Schermerhorn <Lee.Schermerhorn@...com>,
	Johannes Weiner <hannes@...xchg.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Christoph Lameter <cl@...ux.com>,
	Alex Shi <alex.shi@...el.com>,
	Mauricio Faria de Oliveira <mauricfo@...ux.vnet.ibm.com>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Don Morris <don.morris@...com>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: Re: [PATCH 23/40] autonuma: sched_set_autonuma_need_balance

On 06/28/2012 08:56 AM, Andrea Arcangeli wrote:
> Invoke autonuma_balance only on the busy CPUs at the same frequency of
> the CFS load balance.
>
> Signed-off-by: Andrea Arcangeli<aarcange@...hat.com>
> ---
>   kernel/sched/fair.c |    3 +++
>   1 files changed, 3 insertions(+), 0 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index dab9bdd..ff288c0 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -4906,6 +4906,9 @@ static void run_rebalance_domains(struct softirq_action *h)
>
>   	rebalance_domains(this_cpu, idle);
>
> +	if (!this_rq->idle_balance)
> +		sched_set_autonuma_need_balance();
> +

Misleading function name in patch 13, this actually calls
sched_autonuma_balance and is not setting a flag like the
name suggests (to me).

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