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

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Message-ID: <4AB8EAF2.1030204@zytor.com>
Date:	Tue, 22 Sep 2009 08:19:14 -0700
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Avi Kivity <avi@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
	Marcelo Tosatti <mtosatti@...hat.com>
Subject: Re: [PATCH v2] core, x86: Add user return notifiers

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?
> 
> 	Ingo

Sorry, limited bandwidth due to LinuxCon, but I like the concept, and 
the previous (partial) patch was really clean.  I agree with Ingo that 
arch support so we can use this as a general facility would be nice, but 
I don't consider that as a prerequisite for merging.

	-hpa

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