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Date: Wed, 10 Aug 2005 14:56:41 -0700
From: "Martin J. Bligh" <mbligh@mbligh.org>
Reply-To: "Martin J. Bligh" <mbligh@mbligh.org>
To: Pavel Machek <pavel@suse.cz>, Daniel Phillips <phillips@arcor.de>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>,
       Benjamin Herrenschmidt <benh@kernel.crashing.org>,
       linux-kernel <linux-kernel@vger.kernel.org>,
       Linux Memory Management <linux-mm@kvack.org>,
       Hugh Dickins <hugh@veritas.com>, Linus Torvalds <torvalds@osdl.org>,
       Andrew Morton <akpm@osdl.org>, Andrea Arcangeli <andrea@suse.de>
Subject: Re: [RFC][patch 0/2] mm: remove PageReserved
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In-Reply-To: <20050810215022.GA2465@elf.ucw.cz>
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--On Wednesday, August 10, 2005 23:50:22 +0200 Pavel Machek <pavel@suse.cz> wrote:

> Hi!
> 
>> > Swsusp is the main "is valid ram" user I have in mind here. It
>> > wants to know whether or not it should save and restore the
>> > memory of a given `struct page`.
>> 
>> Why can't it follow the rmap chain?
> 
> It is walking physical memory, not memory managment chains. I need
> something like:

Can you not use page_is_ram(pfn) ?

M.