RE: clear the kill-ring and free memory?

[Drew Adams]

> Oops, I meant `yank-menu-length'.

FWIW, in spite of the name, that var is not about the length of the menu
(`yank-menu'), which is controlled by `kill-ring-max'.

`yank-menu-length' controls the length of each menu *item* (each kill
shown in the menu - the max number of chars).  If a kill is longer than
that length then the menu item shows it with elision, e.g. "Foo Ba...".

So yes, if you have large kills, that var can save memory too.  Just
wanted to point out that its name is somewhat misleading - it does
not control the length of the yank menu.