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.senozhat...@gmail.com> Acked-by: Minchan Kim <minc...@kernel.org>
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