From: "Michael S. Tsirkin" <mst@redhat.com>
To: Davide Libenzi <davidel@xmailserver.org>
Cc: Avi Kivity <avi@redhat.com>,
mtosatti@redhat.com, kvm@vger.kernel.org,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove
Date: Thu, 21 Jan 2010 19:50:15 +0200 [thread overview]
Message-ID: <20100121175014.GI16707@redhat.com> (raw)
In-Reply-To: <alpine.DEB.2.00.1001210949280.8786@makko.or.mcafeemobile.com>
On Thu, Jan 21, 2010 at 09:50:34AM -0800, Davide Libenzi wrote:
> On Thu, 21 Jan 2010, Avi Kivity wrote:
>
> > On 01/21/2010 07:32 PM, Michael S. Tsirkin wrote:
> > >
> > > > Can't you read from the file?
> > > >
> > > IMO no, the read could block.
> > >
> >
> > But you're in process context. An eventfd never blocks.
>
> Can you control the eventfd flags? Because if yes, O_NONBLOCK will never
> block.
>
Userspace can but kvm can't.
>
> - Davide
>
prev parent reply other threads:[~2010-01-21 17:53 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-01-21 16:26 [PATCHv2 1/3] eventfd: allow atomic read and waitqueue remove Michael S. Tsirkin
2010-01-21 16:58 ` Davide Libenzi
2010-01-21 17:13 ` Avi Kivity
2010-01-21 17:14 ` Avi Kivity
2010-01-21 17:23 ` Michael S. Tsirkin
2010-01-21 17:33 ` Avi Kivity
2010-01-21 17:32 ` Michael S. Tsirkin
2010-01-21 17:47 ` Avi Kivity
2010-01-21 17:45 ` Michael S. Tsirkin
2010-01-21 17:56 ` Avi Kivity
2010-01-21 17:57 ` Avi Kivity
2010-01-21 18:02 ` Michael S. Tsirkin
2010-01-24 11:06 ` Avi Kivity
2010-01-21 17:50 ` Davide Libenzi
2010-01-21 17:50 ` Michael S. Tsirkin [this message]
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