Re: [PATCH v3 21/21] mm: zone lru vectors interleaving

[Andi Kleen]

> +config PAGE_LRU_SPLIT
> +	int "Memory lru lists per zone"
> +	default	4 if EXPERIMENTAL && SPARSEMEM_VMEMMAP
> +	default 1
> +	help
> +	  The number of lru lists in each memory zone for interleaving.
> +	  Allows to redeuce lru_lock contention, but adds some overhead.
> +	  Without SPARSEMEM_VMEMMAP might be costly. "1" means no split.

Could you turn those two numbers into a boot option? Compile time 
parameters are nasty to use.

I suppose it's ok to have an upper limit.

> +
> +config PAGE_LRU_INTERLEAVING
> +	int "Memory lru lists interleaving page-order"
> +	default	12
> +	help
> +	  Page order for lru lists interleaving. By default 12 (16Mb).
> +	  Must be greater than huge-page order.
> +	  With CONFIG_PAGE_LRU_SPLIT=1 has no effect.

-Andi
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