linux-kernel - Re: [patch 1/9] Guest page hinting: unused / free pages.

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Message-Id: <1157124821.28577.88.camel@localhost.localdomain>
Date:	Fri, 01 Sep 2006 08:33:41 -0700
From:	Dave Hansen <haveblue@...ibm.com>
To:	Martin Schwidefsky <schwidefsky@...ibm.com>
Cc:	linux-kernel@...r.kernel.org, virtualization@...ts.osdl.org,
	akpm@...l.org, nickpiggin@...oo.com.au, frankeh@...son.ibm.com,
	rhim@...gateh.edu
Subject: Re: [patch 1/9] Guest page hinting: unused / free pages.

On Fri, 2006-09-01 at 13:09 +0200, Martin Schwidefsky wrote:
> +++ linux-2.6-patched/mm/page_alloc.c   2006-09-01 12:49:35.000000000
> +0200
> @@ -515,6 +515,7 @@ static void __free_pages_ok(struct page 
>                 reserved += free_pages_check(page + i);
>         if (reserved)
>                 return;
> +       page_set_unused(page, order);
>  
>         kernel_map_pages(page, 1 << order, 0);
>         local_irq_save(flags); 

Do these have anything in common with arch_free_page()?  I thought
marking the pages as being "unused by the kernel" was the whole idea of
having that hook.

-- Dave

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