Re: [RFC PATCH 0/1] mm: Reduce direct reclaim stalls with RAM-backed swap

[Sergey Senozhatsky]

On (26/03/03 11:53), Matt Fleming wrote:
> What about mixed swap configurations (zram + disk)?
> 
>   When at least one disk-backed swap device is active,
>   swap_all_ram_backed is false and the current behaviour is preserved.
>   Per-device reclaimable accounting is possible but it's a much larger
>   change, and mixed zram+disk configurations are uncommon in practice
>   AFAIK.

There are also setups where zram is configured with a backing device
(a real physical device) to which zram writeback pages, effectively
releasing pool memory that they occupied.