On Tue, 24 Nov 2015, Joonsoo Kim wrote: > When I tested compaction in low memory condition, I found that > my benchmark is stuck in congestion_wait() at shrink_inactive_list(). > This stuck last for 1 sec and after then it can escape. More investigation > shows that it is due to stale vmstat value. vmstat is updated every 1 sec > so it is stuck for 1 sec. vmstat values are not designed to be accurate and are not guaranteed to be accurate. Comparing to specific values should not be done. If you need an accurate counter then please use another method of accounting like an atomic. -- 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>