Re: [PATCH] Remove 8 bytes from struct page on 64bit archs

[William Lee Irwin III]

On Sun, Jan 06, 2002 at 11:39:14PM +1100, Anton Blanchard wrote:
> It seems shortening struct page is all the rage at the moment and I
> didnt want to be left out. On some 64bit architectures (sparc64 and
> ppc64 for example) all memory is allocated in the DMA zone. Therefore
> there is no reason to waste 8 bytes per page when every page points to
> the same zone!

Very true. I devised something to address this that appears to work on
multiple architectures already by folding ->zone into ->flags, which
could be useful. (Dave Jones recommended I just let arch maintainers
for things other than i386 mess with page_address() for other arches.)
OTOH, I'm more interested in getting it trimmed down than getting credit.

Cheers,
Bill

P.S.:

My i386 version, which makes ->virtual conditional on CONFIG_HIGHMEM as
well, is at:

ftp://ftp.kernel.org/pub/linux/kernel/people/wli/vm/struct_page/struct_page-2.4.17-rc2