linux-kernel - Re: [PATCH v2] core, x86: Add user return notifiers

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Message-ID: <20090922113708.65f655f6@infradead.org>
Date:	Tue, 22 Sep 2009 11:37:08 +0200
From:	Arjan van de Ven <arjan@...radead.org>
To:	Avi Kivity <avi@...hat.com>
Cc:	Ingo Molnar <mingo@...e.hu>, "H. Peter Anvin" <hpa@...or.com>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH v2] core, x86: Add user return notifiers

On Tue, 22 Sep 2009 12:25:33 +0300
Avi Kivity <avi@...hat.com> wrote:

> On 09/19/2009 09:40 AM, Avi Kivity wrote:
> > Add a general per-cpu notifier that is called whenever the kernel is
> > about to return to userspace.  The notifier uses a thread_info flag
> > and existing checks, so there is no impact on user return or context
> > switch fast paths.
> >    
> 
> Ingo/Peter?

isn't this like really expensive when used ?



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Arjan van de Ven 	Intel Open Source Technology Centre
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