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

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Message-Id: <1253638554.18939.5.camel@laptop>
Date:	Tue, 22 Sep 2009 18:55:54 +0200
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
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, 2009-09-22 at 19:52 +0300, Avi Kivity wrote:
> On 09/22/2009 07:50 PM, Peter Zijlstra wrote:
> >> 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...
> >    
> 
> If you're using lockdep, surely that's not your biggest worry?

No, but that's all under #ifdef and fully disappears when not enabled.
Generic return-tu-user notifiers don't sound like they will though.

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