linux-kernel - Re: [PATCH 0/2] eventfd: new EFD

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Message-ID: <alpine.DEB.2.00.0908270718510.3809@makko.or.mcafeemobile.com>
Date:	Thu, 27 Aug 2009 07:20:09 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	"Michael S. Tsirkin" <mst@...hat.com>
cc:	Avi Kivity <avi@...hat.com>, gleb@...hat.com, kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 0/2] eventfd: new EFD_STATE flag

On Thu, 27 Aug 2009, Michael S. Tsirkin wrote:

> On Thu, Aug 27, 2009 at 07:13:32AM +0300, Avi Kivity wrote:
> > On 08/27/2009 02:30 AM, Davide Libenzi wrote:
> >> On Wed, 26 Aug 2009, Davide Libenzi wrote:
> >>
> >>    
> >>>> I see no kernel equivalent to read(), but that's easily done.
> >>>>        
> >>> Adding an in-kernel read based on "ctx", that is no problem at all.
> >>>      
> >> Something like the untested below.
> >> I had thought you said the eventfd readers where in userspace, but I might
> >> have misunderstood you.
> >>    
> >
> > No, they're all over the place.
> 
> Further, with Davide's proposal you must be a reader to signal events.

To signal events, you must have an instance of "ctx" (with the new 
exposed eventfd_ctx_read). How would you do otherwise?


- Davide


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