On Mon, 23 Aug 2010, Mel Gorman wrote: > This patch introduces zone_nr_free_pages() to take a slightly more accurate > estimate of NR_FREE_PAGES while kswapd is awake. The estimate is not perfect > and may result in cache line bounces but is expected to be lighter than the > IPI calls necessary to continually drain the per-cpu counters while kswapd > is awake. The delta of the counters could also be reduced to increase accuracy. See refresh_zone_stat_thresholds(). Also would it be possible to add the summation function to vmstat? It may be useful elsewhere. A new function like zone_page_state_snapshot() or so? -- 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>