Messages in this thread | | | Date | Mon, 29 Jun 2015 18:06:34 +0900 | From | Sergey Senozhatsky <> | Subject | Re: [RFC][PATCHv3 3/7] zsmalloc: always keep per-class stats |
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On (06/29/15 15:40), Minchan Kim wrote: > 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@gmail.com> > Acked-by: Minchan Kim <minchan@kernel.org> >
thanks.
-ss
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