On Fri, Jun 17, 2016 at 01:27:09PM +0200, Vlastimil Babka wrote: > On 06/09/2016 08:04 PM, Mel Gorman wrote: > >The fair zone allocation policy interleaves allocation requests between > >zones to avoid an age inversion problem whereby new pages are reclaimed > >to balance a zone. Reclaim is now node-based so this should no longer be > >an issue and the fair zone allocation policy is not free. This patch > >removes it. > > I wonder if fair zone allocation had the side effect of preventing e.g. a > small Normal zone to be almost fully occupied by long-lived unreclaimable > allocations early in the kernel lifetime. So that might be one thing to > watch out for. It's a marginal corner case and the zonelist scan is slightly inefficient as the first zone is always skipped but the impact is light. > But otherwise I would agree it should be no longer needed > with node-based reclaim. > > >Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> > > Acked-by: Vlastimil Babka <vbabka@xxxxxxx> > Thanks. -- Mel Gorman SUSE Labs -- 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/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>