[PATCH] provide means to access the zone from the corresponding chunk

[Daniel Berlin]

On May 7, 2004, at 9:59 AM, Paolo Bonzini wrote:

> This patch enables the zone collector to recover the page_entry and
> alloc_zone structures from the address of an arbitrary ggc_alloc-ed 
> pointer.  Unfortunately, while very useful, this is quite invasive.

Why do we need to do this?
I specifically removed the ability to do this when i removed the lookup 
table we used to use.
What exactly useful property does being able to get the page entry have?