linux-kernel - Re: [PATCH 3/3] eventfd: add internal reference counting to fix notifier race conditions

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Date:	Mon, 22 Jun 2009 21:41:39 +0300
From:	"Michael S. Tsirkin" <mst@...hat.com>
To:	Davide Libenzi <davidel@...ilserver.org>
Cc:	Gregory Haskins <ghaskins@...ell.com>, kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	avi@...hat.com, paulmck@...ux.vnet.ibm.com,
	Ingo Molnar <mingo@...e.hu>,
	Rusty Russell <rusty@...tcorp.com.au>
Subject: Re: [PATCH 3/3] eventfd: add internal reference counting to fix
	notifier race conditions

On Mon, Jun 22, 2009 at 11:03:22AM -0700, Davide Libenzi wrote:
> In your case of kernel-to-kernel scenario, why would you need eventfd at 
> all, if userspace role in that model is simply to create it?

That's not 100% true. We have a mode where userspace is the producer
and/or consumer (migration mode) and we switch between that and
direct kernel-to-kernel communication.

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