On 06/09/2016 08:04 PM, Mel Gorman wrote:
Patch "mm: vmscan: Begin reclaiming pages on a per-node basis" started thinking of reclaim in terms of nodes but kswapd is still zone-centric. This patch gets rid of many of the node-based versus zone-based decisions. o A node is considered balanced when any eligible lower zone is balanced. This eliminates one class of age-inversion problem because we avoid reclaiming a newer page just because it's in the wrong zone o pgdat_balanced disappears because we now only care about one zone being balanced. o Some anomalies related to writeback and congestion tracking being based on zones disappear. o kswapd no longer has to take care to reclaim zones in the reverse order that the page allocator uses. o Most importantly of all, reclaim from node 0 with multiple zones will have similar aging and reclaiming characteristics as every other node. Signed-off-by: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Acked-by: Vlastimil Babka <vbabka@xxxxxxx> -- 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>