On Fri, 14 Dec 2018, Mel Gorman wrote: > > In other words, I think there is a lot of potential stranding that occurs > > for both scanners that could otherwise result in completely free > > pageblocks. If there a single movable page present near the end of the > > zone in an otherwise fully free pageblock, surely we can do better than > > the current implementation that would never consider this very easy to > > compact memory. > > > > While it's somewhat premature, I posted a series before I had a full set > of results because it uses free lists to reduce searches and reduces > inference between multiple scanners. Preliminary results indicated it > boosted allocation success rates by 20%ish, reduced migration scanning > by 99% and free scanning by 27%. >
Always good to have code to look at, I'll take a closer look. I've unfortunately been distracted with other kernel issues lately :/
