Subject: Re: uvm_page_physload
To: None <skrll@NetBSD.org>
From: Izumi Tsutsui <email@example.com>
Date: 08/25/2006 22:52:25
> Is end/avail_end inclusive or not?
uvm/uvm_page.c has the following comment:
>> * uvm_page_physload: load physical memory into VM system
>> * => all args are PFs
>> * => all pages in start/end get vm_page structures
>> * => areas marked by avail_start/avail_end get added to the free page pool
>> * => we are limited to VM_PHYSSEG_MAX physical memory segments
It looks struct vm_page is prepared for pages between start and end,
and only pages between avail_start and avail_end are registered into
the free page pool.
But I'm not sure whether it's worth to have struct vm_page for
pages which aren't free. Actually many ports don't register
memory where kernel itself is loaded (or memory for msgbuf
which is not managed), for example.