Re: [RFC][PATCH 4/5] memory_pressure_notify() caller

[KOSAKI Motohiro]

Hi Kame,

> > > > +	notify_threshold = (zone->pages_high +
> > > > +			    zone->lowmem_reserve[MAX_NR_ZONES-1]) * 2;
> > > > +
> > > Why MAX_NR_ZONES-1 ?
> > 
> > this is intent to max lowmem_reserve.
> > 
> Ah, my point is.. how about this ?
> ==
> if (page_zoneid(page) != ZONE_DMA)
> 	notify_threshold = zone->pages_high +
>                    	zone->lowmem_reserve[page_zoneid(page) - 1] * 2;

your point out is very good point.

but judged by zone size is more better, may be.
on some 64bit system, ZONE_DMA is 4GB.
small memory system can't ignore it. 

fortunately, zone size check can at free_area_init_core().


- kosaki



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