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

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Message-Id: <1253638205.18939.4.camel@laptop>
Date:	Tue, 22 Sep 2009 18:50:05 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	Avi Kivity <avi@...hat.com>, "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, 2009-09-22 at 16:32 +0200, Ingo Molnar wrote:
> * 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?

And here I was thinking this was one of the hottest code paths in the
whole kernel...

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