On Mon, Dec 17, 2012 at 01:12:33PM -0500, Johannes Weiner wrote: > A swappiness of 0 has a slightly different meaning for global reclaim > (may swap if file cache really low) and memory cgroup reclaim (never > swap, ever). > > In addition, global reclaim at highest priority will scan all LRU > lists equal to their size and ignore other balancing heuristics. > UNLESS swappiness forbids swapping, then the lists are balanced based > on recent reclaim effectiveness. UNLESS file cache is running low, > then anonymous pages are force-scanned. > > This (total mess of a) behaviour is implicit and not obvious from the > way the code is organized. At least make it apparent in the code flow > and document the conditions. It will be it easier to come up with > sane semantics later. > > 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>