Re: Some highmem pages still in use after shrink_all_memory()?

[Arjan van de Ven]

> Note that there are some applications for which it is a *bug* if an
> mlocked page gets written out to magnetic media.  (gpg, for example.)

mlock() does not guarantee things not hitting magnetic media, just as
mlock() doesn't guarantee that the physical address of a page doesn't
change. mlock guarantees that you won't get hard pagefaults and that you
have guaranteed memory for the task at hand (eg for realtime apps and
oom-critical stuff)

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