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Date: Fri, 29 Dec 2000 13:51:33 -0800 (PST)
From: Linus Torvalds <torvalds@transmeta.com>
To: "David S. Miller" <davem@redhat.com>
cc: markhe@veritas.com, ak@suse.de, marcelo@conectiva.com.br,
        linux-kernel@vger.kernel.org
Subject: Re: test13-pre5
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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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