linux-kernel - Re: [PATCH] Allow preemption during lazy mmu updates

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Message-ID: <49EAF9D6.1010600@redhat.com>
Date:	Sun, 19 Apr 2009 13:15:50 +0300
From:	Avi Kivity <avi@...hat.com>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
CC:	Ingo Molnar <mingo@...e.hu>, Jeremy Fitzhardinge <jeremy@...p.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	the arch/x86 maintainers <x86@...nel.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Nick Piggin <nickpiggin@...oo.com.au>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [PATCH] Allow preemption during lazy mmu updates

Peter Zijlstra wrote:
> On Wed, 2009-04-08 at 16:54 +0200, Ingo Molnar wrote:
>   
>>>  kernel/sched.c                     |    2 -
>>>       
>> Needs the ack of ... oh, never mind - this one is fine i guess ;-)
>>     
>
> Ah, about that. This new preemption hook has slightly different
> requirements than the current preempt-notifiers have (hence the new
> hook), I was wondering if KVM (afaik currently the only preempt-notifier
> consumer) could live with these requirements.
>
> That is, could these be merged?
>   

What are the slight differences in requirements?

KVM wants to run in non-preemptible, interrupts-enabled context.


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

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