Hi Andrew,

Den tors 25 okt. 2018 kl 21:42 skrev Andrew Morton <
akpm@linux-foundation.org>:

> On Thu, 25 Oct 2018 11:28:21 +0200 Vitaly Wool <vitalywool@gmail.com>
> wrote:
>
> > Reclaim and free can race on an object (which is basically ok) but
> > in order for reclaim to be able to  map "freed" object we need to
> > encode object length in the handle. handle_to_chunks() is thus
> > introduced to extract object length from a handle and use it during
> > mapping of the last object we couldn't correctly map before.
>
> What are the runtime effects of this change?
>

I haven't observed any adverse impact with this change used in zswap (and
in fact, this is a bugfix for zswap operation). There is a slight under 1%
impact when z3fold is used with ZRAM but since the support for ZRAM over
zpool is still out of tree, I take it doesn't matter at this point, right?

Best regards,
   Vitaly