On Thu, Dec 13, 2012 at 10:41:04AM +0000, Mel Gorman wrote: > On Wed, Dec 12, 2012 at 04:43:35PM -0500, Johannes Weiner wrote: > > In certain cases (kswapd reclaim, memcg target reclaim), a fixed > > minimum amount of pages is scanned from the LRU lists on each > > iteration, to make progress. > > > > Do not make this minimum bigger than the respective LRU list size, > > however, and save some busy work trying to isolate and reclaim pages > > that are not there. > > > > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> > > This looks like a corner case where the LRU size would have to be smaller > than SWAP_CLUSTER_MAX. Is that common enough to care? It looks correct, > I'm just curious. We have one lruvec per memcg per zone, so consider memory cgroups in a NUMA environment: NR_MEMCG * (NR_NODES - 1) * NR_LRU_LISTS permanently empty lruvecs, assuming the memory of one cgroup is bound to one node. -- 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>