linux-kernel - Re: [PATCH][RFC] kvm-scheduler integration

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Message-ID: <p73ir8uzpcx.fsf@bingen.suse.de>
Date:	08 Jul 2007 21:07:10 +0200
From:	Andi Kleen <andi@...stfloor.org>
To:	avi@...ranet.com
Cc:	linux-kernel@...r.kernel.org
Subject: Re: [PATCH][RFC] kvm-scheduler integration

Avi Kivity <avi-atKUWr5tajBWk0Htik3J/w@...lic.gmane.org> writes:
> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index 693f0e6..b705876 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -875,6 +875,10 @@ struct task_struct {
>  	pid_t pid;
>  	pid_t tgid;
>  
> +#ifdef CONFIG_SCHED_KVM
> +	struct kvm_vcpu *kvm_vcpu;
> +#endif

You should be careful to put this into a cache line that 
is already touched during context switch. Otherwise
if it needs an additional cache miss it might become
very costly

Also it's a bit worrying to expose hooks into the scheduler
to any modules. How would others be stopped from abusing this?

-Andi
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