> > Also in all recent kernels, if the machine is swapping, swap cache
> > grows without limits and is hard to recycle, but then again that is
> > a known problem.
> This one bugs me. I do not see that and can't understand why.
To throw away dirty and dead swapcache (its done at swap writepage())
pages page_launder() has to run into its second loop (launder_loop = 1)
(meaning that a lot of clean cache has been thrown out already).
We can "short circuit" this dead swapcache pages by cleaning them in the
first page_launder() loop.
Take a look at the writepage() patch I sent to Linus a few days ago.
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