On Thu, Jun 18, 2015 at 08:46:40PM +0900, Sergey Senozhatsky wrote: > Always account per-class `zs_size_stat' stats. This data will > help us make better decisions during compaction. We are especially > interested in OBJ_ALLOCATED and OBJ_USED, which can tell us if > class compaction will result in any memory gain. > > For instance, we know the number of allocated objects in the class, > the number of objects being used (so we also know how many objects > are not used) and the number of objects per-page. So we can ensure > if we have enough unused objects to form at least one ZS_EMPTY > zspage during compaction. > > We calculate this value on per-class basis so we can calculate a > total number of zspages that can be released. Which is exactly what > a shrinker wants to know. > > Signed-off-by: Sergey Senozhatsky <sergey.senozhatsky@xxxxxxxxx> Acked-by: Minchan Kim <minchan@xxxxxxxxxx> -- 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>