On Wed, 2 Nov 2011 17:32:47 +0100 Johannes Weiner <jweiner@xxxxxxxxxx> wrote: > The idea in 9ff473b 'vmscan: evict streaming IO first' was to steer > reclaim focus onto file pages with every new file page that hits the > lru list, so that an influx of used-once file pages does not lead to > swapping of anonymous pages. > > The problem is that nobody is fixing up the balance if the pages in > fact become part of the resident set. > > Anonymous page creation is neutral to the inter-lru balance, so even a > comparably tiny number of heavily used file pages tip the balance in > favor of the file list. > > In addition, there is no refault detection, and every refault will > bias the balance even more. A thrashing file working set will be > mistaken for a very lucrative source of reclaimable pages. > > As anonymous pages are no longer swapped above a certain priority > level, this mechanism is no longer needed. Used-once file pages > should get reclaimed before the VM even considers swapping. > > Signed-off-by: Johannes Weiner <jweiner@xxxxxxxxxx> Do you have some results ? Thanks, -Kame -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>