linux-kernel - Re: [RFC][PATCH] Improving directed yield scalability for PLE handler

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Date:	Mon, 10 Sep 2012 22:19:20 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	habanero@...ux.vnet.ibm.com
Cc:	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>,
	Avi Kivity <avi@...hat.com>,
	Marcelo Tosatti <mtosatti@...hat.com>,
	Ingo Molnar <mingo@...hat.com>, Rik van Riel <riel@...hat.com>,
	KVM <kvm@...r.kernel.org>, chegu vinod <chegu_vinod@...com>,
	LKML <linux-kernel@...r.kernel.org>, X86 <x86@...nel.org>,
	Gleb Natapov <gleb@...hat.com>,
	Srivatsa Vaddagiri <srivatsa.vaddagiri@...il.com>
Subject: Re: [RFC][PATCH] Improving directed yield scalability for PLE
 handler

On Mon, 2012-09-10 at 15:12 -0500, Andrew Theurer wrote:
> +       /*
> +        * if the target task is not running, then only yield if the
> +        * current task is in guest mode
> +        */
> +       if (!(p_rq->curr->flags & PF_VCPU))
> +               goto out_irq; 

This would make yield_to() only ever work on KVM, not that I mind this
too much, its a horrid thing and making it less useful for (ab)use is a
good thing, still this probably wants mention somewhere :-)
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