linux-kernel - Re: [PATCH][KVM][retry 3] Add support for Pause Filtering to AMD SVM

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Message-ID: <20090520074014.GB14846@elte.hu>
Date:	Wed, 20 May 2009 09:40:14 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mark Langsdorf <mark.langsdorf@....com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Joerg Roedel <joerg.roedel@....com>, avi@...hat.com,
	kvm@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH][KVM][retry 3] Add support for Pause Filtering to AMD
	SVM


* Mark Langsdorf <mark.langsdorf@....com> wrote:

> diff --git a/include/linux/sched.h b/include/linux/sched.h
> index b4c38bc..683bc65 100644
> --- a/include/linux/sched.h
> +++ b/include/linux/sched.h
> @@ -2283,6 +2283,9 @@ static inline unsigned int task_cpu(const struct task_struct *p)
>  	return task_thread_info(p)->cpu;
>  }
>  
> +extern void set_task_delay(struct task_struct *p, unsigned int delay);

> +++ b/kernel/sched.c
> @@ -1947,6 +1947,11 @@ task_hot(struct task_struct *p, u64 now, struct sched_domain *sd)
>  	return delta < (s64)sysctl_sched_migration_cost;
>  }
>  
> +void set_task_delay(struct task_struct *p, unsigned int delay)
> +{
> +	p->se.vruntime += delay;
> +}
> +EXPORT_SYMBOL(set_task_delay);

vruntime is nice level scaled, so this is broken. Please run this 
through the scheduler folks, we can get a facility into an isolated 
brach for Avi to pull, but it needs some thought.

	Ingo
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