On (07/07/15 22:39), Minchan Kim wrote:
[..]
> >  struct zs_pool_stats {
> > -   /* How many objects were migrated */
> > -   u64             num_migrated;
> > +   /* How many pages were migrated (freed) */
> > +   u64             pages_compacted;
> 
> Hmm, if we account it as page unit, unsigned long is enough for 32bit.

Well, this is a 'how many pages were freed overall' counter. We don't
control the lifetime of device, so I think it can be bigger than 4 bytes
in some `extreme' cases.

        -ss
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