On Wed, Dec 12, 2012 at 04:43:39PM -0500, Johannes Weiner wrote: > The restart logic for when reclaim operates back to back with > compaction is currently applied on the lruvec level. But this does > not make sense, because the container of interest for compaction is a > zone as a whole, not the zone pages that are part of a certain memory > cgroup. > > Negative impact is bounded. For one, the code checks that the lruvec > has enough reclaim candidates, so it does not risk getting stuck on a > condition that can not be fulfilled. And the unfairness of hammering > on one particular memory cgroup to make progress in a zone will be > amortized by the round robin manner in which reclaim goes through the > memory cgroups. Still, this can lead to unnecessary allocation > latencies when the code elects to restart on a hard to reclaim or > small group when there are other, more reclaimable groups in the zone. > > Move this logic to the zone level and restart reclaim for all memory > cgroups in a zone when compaction requires more free pages from it. > > Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx> Acked-by: Mel Gorman <mgorman@xxxxxxx> -- 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>