On Mon, 2016-06-06 at 15:48 -0400, Johannes Weiner wrote:
> When the splitlru patches divided page cache and swap-backed pages
> into separate LRU lists, the pressure balance between the lists was
> biased to account for the fact that streaming IO can cause memory
> pressure with a flood of pages that are used only once. New page
> cache
> additions would tip the balance toward the file LRU, and repeat
> access
> would neutralize that bias again. This ensured that page reclaim
> would
> always go for used-once cache first.
>
> Since e9868505987a ("mm,vmscan: only evict file pages when we have
> plenty"), page reclaim generally skips over swap-backed memory
> entirely as long as there is used-once cache present, and will apply
> the LRU balancing when only repeatedly accessed cache pages are left
> -
> at which point the previous use-once bias will have been neutralized.
>
> This makes the use-once cache balancing bias unnecessary. Remove it.
>
The code in get_scan_count() still seems to use the statistics
of which you just removed the updating.
What am I overlooking?
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