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Re: [RFC v3 2/2] mm, compaction: make kcompactd rely on sysctl_extfrag_threshold

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  Re: [RFC v3 2/2] mm, compaction: make kcompactd rely on  sysctl_extfrag_threshold Vlastimil Babka <vbabka@suse.cz> - 2015-08-10 12:00 +0200

#1203975 — Re: [RFC v3 2/2] mm, compaction: make kcompactd rely on sysctl_extfrag_threshold

On 08/09/2015 07:21 PM, PINTU KUMAR wrote:
>>
>> -extern int fragmentation_index(struct zone *zone, unsigned int order);
>> +extern int fragmentation_index(struct zone *zone, unsigned int order,
>
>> +                            bool ignore_suitable);
>
> We would like to retain the original fragmentation_index as it is.
> Because in some cases people may be using it without kcompactd.
> In such cases, future kernel upgrades will suffer.
> In my opinion fragmentation_index should work just based on zones and order.

I don't understand the concern. If you pass 'false' to ignore_suitable, 
you get the standard behavior. Only kcompactd uses the altered behavior.

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