linux-kernel - Re: [PATCH v9 3/5] virtio_balloon: introduce migration primitives to balloon pages

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Message-ID: <20120828180539.GB1750@t510.redhat.com>
Date:	Tue, 28 Aug 2012 15:05:39 -0300
From:	Rafael Aquini <aquini@...hat.com>
To:	"Michael S. Tsirkin" <mst@...hat.com>
Cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	Rusty Russell <rusty@...tcorp.com.au>,
	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>,
	Minchan Kim <minchan@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: Re: [PATCH v9 3/5] virtio_balloon: introduce migration primitives to
 balloon pages

On Tue, Aug 28, 2012 at 08:57:16PM +0300, Michael S. Tsirkin wrote:
> Sorry I do not understand what you are saying here. So find
> a different locking strategy.
> 
> For example something like:
> 
>          wait_event(vb->config_change,
> 		({ 
> 		   lock
> 		   if (target <= (num_pages - isolated_pages))
> 			   leak balloon
> 		   cond = target <= (num_pages - isolated_pages));
> 		   unlock;
> 		   cond;
> 		})
> 		)
> 
> seems to have no issues?

Ok, I see what you mean. I'll change it.

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