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

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Message-ID: <20090922143223.GA31702@elte.hu>
Date:	Tue, 22 Sep 2009 16:32:23 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Avi Kivity <avi@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	"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


* 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?

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
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