linux-kernel - Re: [PATCH] use unfair spinlock when running on hypervisor.

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Message-ID: <20100603130450.GA26607@linux.vnet.ibm.com>
Date:	Thu, 3 Jun 2010 18:34:50 +0530
From:	Srivatsa Vaddagiri <vatsa@...ibm.com>
To:	Nick Piggin <npiggin@...e.de>
Cc:	Avi Kivity <avi@...hat.com>, Andi Kleen <andi@...stfloor.org>,
	Gleb Natapov <gleb@...hat.com>, linux-kernel@...r.kernel.org,
	kvm@...r.kernel.org, hpa@...or.com, mingo@...e.hu,
	tglx@...utronix.de, mtosatti@...hat.com
Subject: Re: [PATCH] use unfair spinlock when running on hypervisor.

On Thu, Jun 03, 2010 at 06:28:21PM +0530, Srivatsa Vaddagiri wrote:
> Ok got it - although that approach is not advisable in some cases for ex: when
> the lock holder vcpu and lock acquired vcpu are scheduled on the same pcpu by
> the hypervisor (which was experimented with in [1] where they foud a huge hit in
> perf).

1. http://lkml.org/lkml/2010/4/13/464

- vatsa
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