On Mon, Nov 07, 2011 at 11:45:20AM +0900, KAMEZAWA Hiroyuki wrote: > 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 ? Not yet, sorry, I had to drop it all and do something else. This change relies on the VM having a different mechanism to go for one-shot file cache first, so I need to address Kosaki-san's concerns about 1/3 before pursuing this patch. -- 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>