swap and swapcache questions

[Justin Sherrill]

Since swapcache is cached disk information, my assumption is that
there's no need to TRIM - if the cached information is out of date, it
just gets overwritten.  The answer probably lies in the source.

On Fri, Jul 4, 2014 at 5:11 AM, Wojciech Puchar
<wojtek at wojtek.tensor.gdynia.pl> wrote:
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> swapon have -e option so TRIM is issued when swap block are freed.
> From swapcache manual i cannot understand if TRIM is used when swapcache is
> pruned
> how is it?