On Fri, Jun 17, 2016 at 12:46:05PM +0200, Vlastimil Babka wrote: > On 06/09/2016 08:04 PM, Mel Gorman wrote: > >kswapd is woken when zones are below the low watermark but the wakeup > >decision is not taking the classzone into account. Now that reclaim is > >node-based, it is only required to wake kswapd once per node and only if > >all zones are unbalanced for the requested classzone. > > > >Note that one node might be checked multiple times but there is no cheap > >way of tracking what nodes have already been visited for zoneslists that > >be ordered by either zone or node. > > Wouldn't it be possible to optimize for node order as you did in direct > reclaim? Do the zone_balanced checks when going through zonelist, and once > node changes in iteration, wake up if no eligible zones visited so far were > balanced. >
Yeah, it is. I'll chuck it in. -- Mel Gorman SUSE Labs
