From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ingo Molnar <mingo@elte.hu>
Subject: Re: [PATCH v2] core, x86: Add user return notifiers
Date: Tue, 22 Sep 2009 16:32:23 +0200
Message-ID: <20090922143223.GA31702@elte.hu>
References: <4AB3CDEC.5050902@zytor.com> <1253342422-13811-1-git-send-email-avi@redhat.com> <4AB8980D.5070803@redhat.com>
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Cc: "H. Peter Anvin" <hpa@zytor.com>, linux-kernel@vger.kernel.org,
	kvm@vger.kernel.org, Marcelo Tosatti <mtosatti@redhat.com>
To: Avi Kivity <avi@redhat.com>,
	Peter Zijlstra <a.p.zijlstra@chello.nl>
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* Avi Kivity <avi@redhat.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?

Would be nice to convert some existing open-coded return-to-user-space 
logic to this facility. One such candidate would be lockdep_sys_exit?

	Ingo