is there a "lru_cache_add_anon_tail"?

[Dan Magenheimer <dan.magenheimer@oracle.com>]

(Still working on allowing zcache to "evict" swap pages...)

Apologies if I got head/tail reversed as used by the
lru queues... the "directional sense" of the queues is
not obvious so I'll describe using different terminology...

If I have an anon page and I would like to add it to
the "reclaim soonest" end of the queue instead of the
"most recently used so don't reclaim it for a long time"
end of the queue, does an equivalent function similar to
lru_cache_add_anon(page) exist?

In other words, I want this dirty anon page to be
swapped out ASAP.

If no such function exists, can anyone more familiar
with the VM LRU queues suggest the code for
this function "lru_cache_add_anon_XXX(page)?
Also what would be the proper text for XXX?

I have some (experimental) code now to use it so
could iterate/debug with any suggested code.  The
calling snippet is:

	__set_page_locked(new_page);
	SetPageSwapBacked(new_page);
	ret = __add_to_swap_cache(new_page, entry);
	if (likely(!ret)) {
		radix_tree_preload_end();
		lru_cache_add_anon_XXX(new_page)
		if (frontswap_get_page(new_page) = 0)
			SetPageUptodate(new_page);
		unlock_page(new_page);

This works using a call to the existing lru_cache_add_anon
but new_page doesn't get swapped out for a long time.

Thanks for any help/suggestions!
Dan

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