linux-kernel - Re: [PATCH v5 1/3] mm: introduce compaction and migration for virtio ballooned pages

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Date:	Mon, 06 Aug 2012 15:06:49 -0400
From:	Rik van Riel <riel@...hat.com>
To:	Rafael Aquini <aquini@...hat.com>
CC:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	"Michael S. Tsirkin" <mst@...hat.com>, Mel Gorman <mel@....ul.ie>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Minchan Kim <minchan@...nel.org>
Subject: Re: [PATCH v5 1/3] mm: introduce compaction and migration for virtio
 ballooned pages

On 08/06/2012 03:00 PM, Rafael Aquini wrote:
> On Mon, Aug 06, 2012 at 02:38:23PM -0400, Rik van Riel wrote:
>> On 08/06/2012 09:56 AM, Rafael Aquini wrote:
>>
>>> @@ -846,6 +861,21 @@ static int unmap_and_move(new_page_t get_new_page, unsigned long private,
>>>   			goto out;
>>>
>>>   	rc = __unmap_and_move(page, newpage, force, offlining, mode);
>>> +
>>> +	if (unlikely(is_balloon_page(newpage)&&
>>> +		     balloon_compaction_enabled())) {
>>
>> Could that be collapsed into one movable_balloon_page(newpage) function
>> call?
>>
> Keeping is_balloon_page() as is, and itroducing this new movable_balloon_page()
> function call, or just doing a plain rename, as Andrew has first suggested?

Just a plain rename would work.

> +static inline bool is_balloon_page(struct page *page)
> +{
> +	return (page->mapping && page->mapping == balloon_mapping);
> +}

As an aside, since you are only comparing page->mapping and
not dereferencing it, it can be simplified to just:

	return (page->mapping == balloon_mapping);



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