linux-kernel - Re: [PATCH 2/2] mm: Update NUMA counter threshold size

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Date:   Wed, 16 Aug 2017 10:31:19 +0800
From:   kemi <kemi.wang@...el.com>
To:     Mel Gorman <mgorman@...hsingularity.net>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Michal Hocko <mhocko@...e.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Dave <dave.hansen@...ux.intel.com>,
        Andi Kleen <andi.kleen@...el.com>,
        Jesper Dangaard Brouer <brouer@...hat.com>,
        Ying Huang <ying.huang@...el.com>,
        Aaron Lu <aaron.lu@...el.com>, Tim Chen <tim.c.chen@...el.com>,
        Linux MM <linux-mm@...ck.org>,
        Linux Kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 2/2] mm: Update NUMA counter threshold size


>>  
>> -static inline unsigned long zone_numa_state(struct zone *zone,
>> +static inline unsigned long zone_numa_state_snapshot(struct zone *zone,
>>  					enum zone_numa_stat_item item)
>>  {
>>  	long x = atomic_long_read(&zone->vm_numa_stat[item]);
>> +	int cpu;
>> +
>> +	for_each_online_cpu(cpu)
>> +		x += per_cpu_ptr(zone->pageset, cpu)->vm_numa_stat_diff[item];
>>  
>>  	return x;
>>  }
> 
> This does not appear to be related to the current patch. It either
> should be merged with the previous patch or stand on its own.
> 
OK. I can move it to an individual patch if it does not make anyone unhappy.
Since it is not graceful to introduce any functionality change in first patch.

>> diff --git a/mm/vmstat.c b/mm/vmstat.c
>> index 5a7fa30..c7f50ed 100644
>> --- a/mm/vmstat.c
>> +++ b/mm/vmstat.c
>> @@ -30,6 +30,8 @@
>>  
>>  #include "internal.h"
>>  
>> +#define NUMA_STAT_THRESHOLD  32765
>> +
> 
> This should be expressed in terms of the type and not a hard-coded value.
> 
OK, Thanks. I will follow it.