From: Waiman Long <waiman.long@hp.com>
To: Paolo Bonzini <pbonzini@redhat.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
kvm@vger.kernel.org, Peter Zijlstra <peterz@infradead.org>,
virtualization@lists.linux-foundation.org,
Andi Kleen <andi@firstfloor.org>,
"H. Peter Anvin" <hpa@zytor.com>,
Michel Lespinasse <walken@google.com>,
Alok Kataria <akataria@vmware.com>,
linux-arch@vger.kernel.org, Gleb Natapov <gleb@redhat.com>,
x86@kernel.org, Ingo Molnar <mingo@redhat.com>,
xen-devel@lists.xenproject.org,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Arnd Bergmann <arnd@arndb.de>,
Scott J Norton <scott.norton@hp.com>,
Steven Rostedt <rostedt@goodmis.org>,
Chris Wright <chrisw@sous-sol.org>,
Thomas Gleixner <tglx@linutronix.de>,
Aswin Chandramouleeswaran <aswin@hp.com>,
Chegu Vinod <chegu_vinod@hp.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
Oleg Nesterov <oleg@redhat.com>,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM
Date: Mon, 17 Mar 2014 13:47:30 -0400 [thread overview]
Message-ID: <53273532.1010003@hp.com> (raw)
In-Reply-To: <5322C0F7.2090604@redhat.com>
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
prev parent reply other threads:[~2014-03-17 17:47 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1394650498-30118-1-git-send-email-Waiman.Long@hp.com>
[not found] ` <1394650498-30118-11-git-send-email-Waiman.Long@hp.com>
2014-03-13 13:59 ` [PATCH RFC v6 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM Paolo Bonzini
[not found] ` <5322035B.5000205@hp.com>
[not found] ` <5322C0F7.2090604@redhat.com>
2014-03-17 17:47 ` Waiman Long [this message]
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