Re: [BK PATCH 2.5] Introduce 64-bit versions of PAGE_{CACHE_,}{MASK,ALIGN}

[William Lee Irwin III]

On Sun, Jul 28, 2002 at 05:10:48PM -0700, Andrew Morton wrote:
> - Few pages use ->private for much.  Hash for it.  4(ish) bytes
>   saved.

Do you know an approximate reasonable constant of proportionality
for how many pages have ->private attached?

On Sun, Jul 28, 2002 at 05:10:48PM -0700, Andrew Morton wrote:
> - Remove the rmap chain (I just broke ptep_to_address() anyway).  4 bytes
>   saved.  struct page is now 20 bytes.

How did ptep_to_address() break? I browsed over your latest changes and
missed the bit where that fell apart. I'll at least take a stab at fixing
it up until the other bits materialize.

Cheers,
Bill