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

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Message-ID: <4AB8E2F1.6030401@redhat.com>
Date:	Tue, 22 Sep 2009 17:45:05 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Ingo Molnar <mingo@...e.hu>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	"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 09/22/2009 05:32 PM, 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?
>    

I only implemented this for x86, while lockdep is arch independent.  If 
arch support is added, it should be trivial.

I think perf counters could use preempt notifiers though, these are arch 
independent.

-- 
error compiling committee.c: too many arguments to function

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