linux-kernel - Re: [PATCH 1/1] kvm : vmx : Remove yield_on

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Message-ID: <20120207211546.GA23022@amt.cnet>
Date:	Tue, 7 Feb 2012 19:15:46 -0200
From:	Marcelo Tosatti <mtosatti@...hat.com>
To:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc:	Anthony Liguori <aliguori@...ibm.com>, KVM <kvm@...r.kernel.org>,
	"H. Peter Anvin" <hpa@...or.com>,
	Thomas Gleixner <tglx@...utronix.de>, X86 <x86@...nel.org>,
	Ingo Molnar <mingo@...hat.com>, Avi Kivity <avi@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Srivatsa Vaddagiri <vatsa@...ux.vnet.ibm.com>,
	Gleb Natapov <gleb@...hat.com>
Subject: Re: [PATCH 1/1] kvm : vmx : Remove yield_on_hlt

On Tue, Feb 07, 2012 at 11:19:20PM +0530, Raghavendra K T wrote:
>   yield_on_hlt was introduced for CPU bandwidth capping. now it is redundant
> with CFS hardlimit.
> 
> yield_on_hlt also complicates the scenario in paravirtual environment, that
> needs to trap halt. for e.g. paravirtualized ticket spinlocks.
> 
> Changelog:
> Remove the support for yield_on_hlt.
> 
> Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>

Applied, thanks.

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