linux-kernel - Re: [PATCH 5/8] sched: Favour moving tasks towards the preferred node

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Message-ID: <20130627160127.GY28407@twins.programming.kicks-ass.net>
Date:	Thu, 27 Jun 2013 18:01:27 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Mel Gorman <mgorman@...e.de>
Cc:	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 5/8] sched: Favour moving tasks towards the preferred node

On Wed, Jun 26, 2013 at 03:38:04PM +0100, Mel Gorman wrote:
> @@ -3897,6 +3907,28 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
>  	return delta < (s64)sysctl_sched_migration_cost;
>  }
>  
> +/* Returns true if the destination node has incurred more faults */
> +static bool migrate_improves_locality(struct task_struct *p, struct lb_env *env)
> +{
> +	int src_nid, dst_nid;
> +
> +	if (!p->numa_faults || !(env->sd->flags & SD_NUMA))
> +		return false;
> +
> +	src_nid = cpu_to_node(env->src_cpu);
> +	dst_nid = cpu_to_node(env->dst_cpu);
> +
> +	if (src_nid == dst_nid)
> +		return false;
> +
> +	if (p->numa_migrate_seq < sysctl_numa_balancing_settle_count &&
> +	    p->numa_preferred_nid == dst_nid)
> +		return true;
> +
> +	return false;
> +}
> +

This references ->numa_faults, which is declared under NUMA_BALANCING
but lacks any such conditionality here.
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