linux-kernel - Re: [KVM PATCH 2/3] eventfd: add a notifier mechanism

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Date:	Thu, 23 Apr 2009 09:23:45 -0700 (PDT)
From:	Davide Libenzi <davidel@...ilserver.org>
To:	Gregory Haskins <ghaskins@...ell.com>
cc:	kvm@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	avi@...hat.com
Subject: Re: [KVM PATCH 2/3] eventfd: add a notifier mechanism

On Thu, 23 Apr 2009, Gregory Haskins wrote:

> This allows synchronous notifications to register with the eventfd
> infrastructure.  Unlike traditional vfs based eventfd readers, notifiees
> do not implictly clear the counter on reception.  However, the clearing
> is primarily important to allowing threads to block waiting for events
> anyway, so its an acceptable trade-off since blocking doesn't apply to
> notifiers.

Do you really need to add a notifier? Eventfd already has a wait queue, 
and we support callback-based wakeups, so is there any reason we shouldn't 
use those and rely on the already existing wakeups?



- Davide


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