Re: [PATCH 0/4] Swap migration V3: Overview

[Andrew Morton]

Marcelo Tosatti <marcelo.tosatti@xxxxxxxxxxxx> wrote:
>
> The fair approach would be to have the
>  number of pages to reclaim also relative to zone size.
> 
>  sc->nr_to_reclaim = (zone->present_pages * sc->swap_cluster_max) /
>                                  total_memory;

You can try it, but that shouldn't matter.  SWAP_CLUSTER_MAX is just a
batching factor used to reduce CPU consumption.  If you make it twice as
bug, we run DMA-zone reclaim half as often - it should balance out.  

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