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Re: [Xen-devel] [PATCH RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM
- To: Paolo Bonzini <pbonzini@xxxxxxxxxx>
- From: Waiman Long <waiman.long@xxxxxx>
- Date: Mon, 17 Mar 2014 13:47:30 -0400
- Cc: Jeremy Fitzhardinge <jeremy@xxxxxxxx>, Raghavendra K T <raghavendra.kt@xxxxxxxxxxxxxxxxxx>, Gleb Natapov <gleb@xxxxxxxxxx>, Peter Zijlstra <peterz@xxxxxxxxxxxxx>, virtualization@xxxxxxxxxxxxxxxxxxxxxxxxxx, Andi Kleen <andi@xxxxxxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, Michel Lespinasse <walken@xxxxxxxxxx>, Alok Kataria <akataria@xxxxxxxxxx>, linux-arch@xxxxxxxxxxxxxxx, kvm@xxxxxxxxxxxxxxx, x86@xxxxxxxxxx, Ingo Molnar <mingo@xxxxxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx, "Paul E. McKenney" <paulmck@xxxxxxxxxxxxxxxxxx>, Arnd Bergmann <arnd@xxxxxxxx>, Scott J Norton <scott.norton@xxxxxx>, Steven Rostedt <rostedt@xxxxxxxxxxx>, Chris Wright <chrisw@xxxxxxxxxxxx>, Thomas Gleixner <tglx@xxxxxxxxxxxxx>, Aswin Chandramouleeswaran <aswin@xxxxxx>, Chegu Vinod <chegu_vinod@xxxxxx>, Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>, Oleg Nesterov <oleg@xxxxxxxxxx>, linux-kernel@xxxxxxxxxxxxxxx
- Delivery-date: Mon, 17 Mar 2014 17:48:06 +0000
- List-id: Xen developer discussion <xen-devel.lists.xen.org>
On 03/14/2014 04:42 AM, Paolo Bonzini wrote:
Il 13/03/2014 20:13, Waiman Long ha scritto:
This should also disable the unfair path.
Paolo
The unfair lock uses a different jump label and does not require any
special PV ops. There is a separate init function for that.
Yeah, what I mean is that the patches that enable paravirtualization
should also take care of decreasing the unfair-lock jump label when
paravirtualization is enabled.
Paolo
As there are people who don't like unfair lock at all, I prefer to give
them the option to turn this on or off instead of forcing them to always
use unfair lock in a PV guest.
-Longman
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