Re: [PATCH] vm - swap_prefetch v12

[Andrew Morton]

Con Kolivas <kernel@xxxxxxxxxxx> wrote:
>
> Once pages have been added to the swapped list, a timer is started, testing
> for conditions suitable to prefetch swap pages every 5 seconds. Suitable
> conditions are defined as lack of swapping out or in any pages, and no
> watermark tests failing. Significant amounts of dirtied ram also prevent
> prefetching. It then checks that we have spare ram looking for at
> least 3* pages_high free per zone and if it succeeds that will prefetch
> pages from swap.

Did you consider poking around in gendisk.disk_stats to determine whether
the swap disk(s) are idleish?
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