linux-kernel - Re: [patch 4/9] Guest page hinting: volatile swap cache.

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Message-Id: <1157123046.28577.75.camel@localhost.localdomain>
Date:	Fri, 01 Sep 2006 08:04:06 -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 4/9] Guest page hinting: volatile swap cache.

On Fri, 2006-09-01 at 13:10 +0200, Martin Schwidefsky wrote:
> +#if defined(CONFIG_PAGE_STATES)
> +
> +struct page * find_get_page_nodiscard(struct address_space *mapping,
> +				      unsigned long offset)
> +{
> +	struct page *page;
> +
> +	read_lock_irq(&mapping->tree_lock);
> +	page = radix_tree_lookup(&mapping->page_tree, offset);
> +	if (page)
> +		page_cache_get(page);
> +	read_unlock_irq(&mapping->tree_lock);
> +	return page;
> +}
> +
> +EXPORT_SYMBOL(find_get_page_nodiscard);
> +
> +#endif

Is it worth having another full copy of find_get_page()?  What about a
"nodiscard" argument?

-- Dave

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