On Fri, 29 Dec 2000, David S. Miller wrote:
>
> For my development testing, I'm running a _heavily_ hacked
> kernel. One of these hacks is to pull the wait_queue_head out of
> struct page; the waitq-heads are in a separate allocated area of
> memory, with a waitq-head pointer embedded in the page structure
> (allocated/initialised in free_area_init_core()). This gives a
> page structure of 60bytes, giving me one free double-word to play
> with (which I'm using as a pointer to a release function).
>
> Not something like those damn Solaris turnstiles, no please....
If you want to have a release function, please just use "page->mapping",
which gives you much more, including memory pressure indicators etc. Now
_that_ can be useful for doing things like slab caches.
Linus
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