linux-kernel - Re: [KVM-RFC PATCH 1/2] eventfd: add an explicit srcu based notifier interface

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Message-ID: <20090618062301.GA11155@redhat.com>
Date:	Thu, 18 Jun 2009 09:23:01 +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>
Subject: Re: [KVM-RFC PATCH 1/2] eventfd: add an explicit srcu based
	notifier interface

On Wed, Jun 17, 2009 at 04:21:19PM -0700, Davide Libenzi wrote:
> The interface is just ugly IMO. You have eventfd_signal() that can sleep, 
> or not, depending on the registered ->signal() function implementations.
> This is pretty bad, a lot worse than the theoretical us spent in the 
> schedule_work() processing.

I agree. How about the idea of introducing eventfd_signal_from_task
which can sleep? Does this sound same?

-- 
MST
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