On Mon, 23 Aug 2010, Mel Gorman wrote: > > The delta of the counters could also be reduced to increase accuracy. > > See refresh_zone_stat_thresholds(). > True, but I thought that would introduce a constant performance penalty > for a corner case which I didn't like. Sure, an increased frequency of updates would increase the chance of bouncing cachelines. But the bouncing cacheline scenario for the vm counters was tuned for applications that continually allocate pages in parallel. When the vm gets into a state where continual reclaim is necessary then the counters are not that frequently updated. If the machine is already slowing down due to reclaim then the vm can likely affort more frequent counter updates. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxxx For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>