You must have been able to reproduce it quite quickly. But the
code has been like that for ages. Why is that? Are you testing
on an unusual machine?
> As to the second fix from 2.5.32, it can't be applicable to 2.4, can it?
> try_to_swap_out() may call add_to_swap_cache() with PG_lru page.
Ah, good point. In 2.5, add_to_page_cache() does not add the
page to the LRU. Anonymous pages are already there, and we
don't need to do that. The first patch should be OK.
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