Hi Andrew,
Den tors 25 okt. 2018 kl 21:42 skrev Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>:
On Thu, 25 Oct 2018 11:28:21 +0200 Vitaly Wool <vitalywool@xxxxxxxxx> 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
