linux-kernel - Re: [PATCH v11 3/7] mm: introduce a common interface for balloon pages mobility

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Message-ID: <20121109175844.GD4308@optiplex.redhat.com>
Date:	Fri, 9 Nov 2012 15:58:44 -0200
From:	Rafael Aquini <aquini@...hat.com>
To:	Mel Gorman <mel@....ul.ie>
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>,
	Andi Kleen <andi@...stfloor.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>,
	Minchan Kim <minchan@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v11 3/7] mm: introduce a common interface for balloon
 pages mobility

On Fri, Nov 09, 2012 at 04:23:27PM +0000, Mel Gorman wrote:
> On Fri, Nov 09, 2012 at 12:53:22PM -0200, Rafael Aquini wrote:
> > > <SNIP>
> > > If you get the barrier issue sorted out then feel free to add
> > > 
> > > Acked-by: Mel Gorman <mel@....ul.ie>
> > > 
> > 
> > I believe we can drop the barriers stuff, as the locking scheme is now provinding
> > enough protection against collisions between isolation page scanning and
> > balloon_leak() page release (the major concern that has lead to the barriers
> > originally)
> > 
> > I'll refactor this patch with no barriers and ensure a better commentary on the
> > aforementioned locking scheme and resubmit, if it's OK to everyone
> > 
> 
> Sounds good to me. When they are dropped again feel free to stick my ack
> on for the compaction and migration parts. The virtio aspects are up to
> someone else :)
> 

Andrew,

If we get no further objections raised on dropping those barriers, would you
like me to resubmit the whole series rebased on the latest -next, 
or just this (new) refactored patch?

-- Rafael
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