linux-kernel - Re: [PATCH 13/13] sched: Account for the number of preferred tasks running on a node when selecting a preferred node

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Message-ID: <20130703183243.GB18898@dyad.programming.kicks-ass.net>
Date:	Wed, 3 Jul 2013 20:32:43 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Ingo Molnar <mingo@...nel.org>,
	Andrea Arcangeli <aarcange@...hat.com>,
	Johannes Weiner <hannes@...xchg.org>,
	Linux-MM <linux-mm@...ck.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 13/13] sched: Account for the number of preferred tasks
 running on a node when selecting a preferred node

On Wed, Jul 03, 2013 at 03:21:40PM +0100, Mel Gorman wrote:
> ---
>  kernel/sched/fair.c  | 45 ++++++++++++++++++++++++++++++++++++++++++---
>  kernel/sched/sched.h |  4 ++++
>  2 files changed, 46 insertions(+), 3 deletions(-)
> 
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index 3c796b0..9ffdff3 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -777,6 +777,18 @@ update_stats_curr_start(struct cfs_rq *cfs_rq, struct sched_entity *se)
>   * Scheduling class queueing methods:
>   */
>  
> +static void account_numa_enqueue(struct rq *rq, struct task_struct *p)
> +{
> +	rq->nr_preferred_running +=
> +			(cpu_to_node(task_cpu(p)) == p->numa_preferred_nid);
> +}
> +
> +static void account_numa_dequeue(struct rq *rq, struct task_struct *p)
> +{
> +	rq->nr_preferred_running -=
> +			(cpu_to_node(task_cpu(p)) == p->numa_preferred_nid);
> +}

Ah doing this requires you dequeue before changing ->numa_preferred_nid. I
don't remember seeing that change in this series.
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