> Note how you also go for seconds with no IO and no shrinking of the
> caches, while shrink_cache() is apparently happy (and no, it does not take
> several seconds to traverse even a 16GB inactive queue, there's something
> else going on)
Did you time it? There is a lot of things going on in the shrink_cache loop
including swap_out, wait_on_page, locks, ...
It's not really simple traversing of a queue.
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