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

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Message-ID: <alpine.DEB.1.10.0906221223240.10952@makko.or.mcafeemobile.com>
Date:	Mon, 22 Jun 2009 12:29:48 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Gregory Haskins <ghaskins@...ell.com>
cc:	"Michael S. Tsirkin" <mst@...hat.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, 22 Jun 2009, Gregory Haskins wrote:

> Michael S. Tsirkin wrote:
> > On Mon, Jun 22, 2009 at 11:51:42AM -0700, Davide Libenzi wrote:
> >   
> >> A file* based kernel-to-kernel interface is rather wrong IMO.
> >>     
> >
> > But eventfd_ctx should work fine.
> >   
> 
> Yeah, and I guess we can always just say that qemu can't close the fd or
> something.  Seems hacky, but it might work if Davide insists we need his
> change.

Continuing here, since there's no reason of having many subthreads talking 
about the same thing.
Can you make a detailed example of what you're trying to achieve (no Hint 
Mode, please)?
As it sounds to me, that you need a consumer/producer reference counting, 
to cover your scenario correctly.



- Davide


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