linux-kernel - Re: [PATCH 9/9] qspinlock,x86,kvm: Implement KVM support for paravirt qspinlock

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Message-ID: <550BCFBC.9000106@linux.vnet.ibm.com>
Date:	Fri, 20 Mar 2015 13:13:56 +0530
From:	Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
To:	Waiman Long <waiman.long@...com>
CC:	Peter Zijlstra <peterz@...radead.org>, tglx@...utronix.de,
	mingo@...hat.com, hpa@...or.com, paolo.bonzini@...il.com,
	konrad.wilk@...cle.com, boris.ostrovsky@...cle.com,
	paulmck@...ux.vnet.ibm.com, riel@...hat.com,
	torvalds@...ux-foundation.org, david.vrabel@...rix.com,
	oleg@...hat.com, scott.norton@...com, doug.hatch@...com,
	linux-arch@...r.kernel.org, x86@...nel.org,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org,
	xen-devel@...ts.xenproject.org, kvm@...r.kernel.org,
	luto@...capital.net
Subject: Re: [PATCH 9/9] qspinlock,x86,kvm: Implement KVM support for paravirt
 qspinlock

On 03/20/2015 02:38 AM, Waiman Long wrote:
> On 03/19/2015 06:01 AM, Peter Zijlstra wrote:
[...]
> You are probably right. The initial apply_paravirt() was done before the
> SMP boot. Subsequent ones were at kernel module load time. I put a
> counter in the __native_queue_spin_unlock() and it registered 26949
> unlock calls in a 16-cpu guest before it got patched out.

because even printks take lock..

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