linux-kernel - Re: [PATCH 1/3] sched,numa: count pages on active node as local

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Date:	Fri, 11 Apr 2014 10:34:33 -0700
From:	Joe Perches <joe@...ches.com>
To:	riel@...hat.com
Cc:	linux-kernel@...r.kernel.org, mingo@...nel.org,
	peterz@...radead.org, chegu_vinod@...com, mgorman@...e.de
Subject: Re: [PATCH 1/3] sched,numa: count pages on active node as local

On Fri, 2014-04-11 at 13:00 -0400, riel@...hat.com wrote:
> This should reduce the overhead of the automatic NUMA placement
> code, when a workload spans multiple NUMA nodes.

trivial style note:

> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
[]
> @@ -1737,6 +1737,7 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags)
>  	struct task_struct *p = current;
>  	bool migrated = flags & TNF_MIGRATED;
>  	int cpu_node = task_node(current);
> +	int local = !!(flags & TNF_FAULT_LOCAL);

Perhaps local would look nicer as bool
and be better placed next to migrated.

	bool migrated = flags & TNF_MIGRATED;
	bool local = flags & TNF_FAULT_LOCAL;
	int cpu_node = task_node(current);

> @@ -1785,6 +1786,17 @@ void task_numa_fault(int last_cpupid, int mem_node, int pages, int flags)
> +	if (!priv && !local && p->numa_group &&
> +			node_isset(cpu_node, p->numa_group->active_nodes) &&
> +			node_isset(mem_node, p->numa_group->active_nodes))
> +		local = 1;

		local = true;


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