Subject: Re: [patch 1/9] Guest page hinting: unused / free pages.
From: Dave Hansen <haveblue@us.ibm.com>
To: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: linux-kernel@vger.kernel.org, virtualization@lists.osdl.org, akpm@osdl.org,
       nickpiggin@yahoo.com.au, frankeh@watson.ibm.com, rhim@cc.gateh.edu
In-Reply-To: <20060901110908.GB15684@skybase>
References: <20060901110908.GB15684@skybase>
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Date: Fri, 01 Sep 2006 08:33:41 -0700
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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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