linux-kernel - Re: [PATCH v4 1/3] mm: introduce compaction and migration for virtio ballooned pages

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Date:	Mon, 23 Jul 2012 11:35:10 +0900
From:	Minchan Kim <minchan@...nel.org>
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>,
	Rik van Riel <riel@...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>,
	Rafael Aquini <aquini@...ux.com>
Subject: Re: [PATCH v4 1/3] mm: introduce compaction and migration for virtio
 ballooned pages

On Mon, Jul 23, 2012 at 11:33:32AM +0900, Minchan Kim wrote:
> Hi Rafael,
> 
> On Fri, Jul 20, 2012 at 04:48:59PM -0300, Rafael Aquini wrote:
> > Howdy Minchan,
> > 
> > Once again, thanks for raising such valuable feedback over here.
> > 
> > On Wed, Jul 18, 2012 at 02:48:24PM +0900, Minchan Kim wrote:
> > > > +/* __isolate_lru_page() counterpart for a ballooned page */
> > > > +static bool isolate_balloon_page(struct page *page)
> > > > +{
> > > > +	if (WARN_ON(!is_balloon_page(page)))
> > > > +		return false;
> > > 
> > > I am not sure we need this because you alreay check it before calling
> > > isolate_balloon_page. If you really need it, it would be better to
> > > add likely in isolate_balloon_page, too.
> > > 
> > 
> > This check point was set in place because isolate_balloon_page() was a publicly
> > visible function and while our current usage looks correct it would not hurt to
> > have something like that done -- think of it as an insurance policy, in case
> > someone else, in the future, attempts to use it on any other place outside this
> > specifc context. 
> > Despite not seeing it as a dealbreaker for the patch as is, I do agree, however,
> > this snippet can _potentially_ be removed from isolate_balloon_page(), since
> > this function has become static to compaction.c.
> 
> Yes. It's not static.

Typo. It's static.

-- 
Kind regards,
Minchan Kim
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