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

[Rik van Riel <riel@redhat.com>]

On 04/11/2014 01:34 PM, Joe Perches wrote:
> On Fri, 2014-04-11 at 13:00 -0400, riel@redhat.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.

The problem is, at the end of the function, local is used as an
array index...

        p->numa_faults_locality[local] += pages;
}

I'm not sure I really want to use a bool as an array index :)

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