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

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Message-ID: <4AC4C8F2.5050708@redhat.com>
Date:	Thu, 01 Oct 2009 17:21:22 +0200
From:	Avi Kivity <avi@...hat.com>
To:	"H. Peter Anvin" <hpa@...or.com>
CC:	Ingo Molnar <mingo@...e.hu>,
	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

On 09/22/2009 06:19 PM, H. Peter Anvin wrote:
> 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.

Re-ping?

If accepted, please merge just the core patch and I will carry all of 
them in parallel.  Once tip is merged I'll drop my copy of the first patch.

-- 
Do not meddle in the internals of kernels, for they are subtle and quick to panic.

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