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.
Subject: Re: [PATCH v7 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM
Date: Fri, 21 Mar 2014 17:41:34 -0400 [thread overview]
Message-ID: <532CB20E.6060603@hp.com> (raw)
In-Reply-To: <532B668A.4010208@redhat.com>
On 03/20/2014 06:07 PM, Paolo Bonzini wrote:
> Il 19/03/2014 21:14, Waiman Long ha scritto:
>> This patch adds the necessary KVM specific code to allow KVM to support
>> the sleeping and CPU kicking operations needed by the queue spinlock PV
>> code.
>
> The remaining problem of this patch is that you cannot get the
> generically optimal configuration: qspinlock on baremetal, PV
> qspinlock on KVM/Xen, unfair qspinlock on VMware/Hyper-V. You really
> need to disable unfair locks in kvm_spinlock_init.
>
> Paolo
>
So you are suggesting that it is not a good idea to have both unfair
lock & PV be enabled together. Right?
In order to disable unfair locks in kvm_spinlock_init(), it has to run
after the unfair lock init code. Do you guys know what determine the
init function execution sequence?
-Longman
next prev parent reply other threads:[~2014-03-21 21:41 UTC|newest]
Thread overview: 51+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-03-19 20:13 [PATCH v7 00/11] qspinlock: a 4-byte queue spinlock with PV support Waiman Long
2014-03-19 20:13 ` [PATCH v7 01/11] qspinlock: A generic 4-byte queue spinlock implementation Waiman Long
2014-03-19 20:13 ` Waiman Long
2014-03-19 20:14 ` [PATCH v7 02/11] qspinlock, x86: Enable x86-64 to use queue spinlock Waiman Long
2014-03-19 20:24 ` Konrad Rzeszutek Wilk
2014-03-19 20:24 ` Konrad Rzeszutek Wilk
2014-03-21 3:36 ` Waiman Long
2014-03-21 3:36 ` Waiman Long
2014-03-21 3:36 ` Waiman Long
2014-03-19 20:24 ` Konrad Rzeszutek Wilk
2014-03-19 20:14 ` Waiman Long
2014-03-19 20:14 ` [PATCH v7 03/11] qspinlock: More optimized code for smaller NR_CPUS Waiman Long
2014-03-19 20:14 ` Waiman Long
2014-03-19 20:14 ` [PATCH v7 04/11] qspinlock: Optimized code path for 2 contending tasks Waiman Long
2014-03-19 20:14 ` Waiman Long
2014-03-19 20:14 ` [PATCH v7 05/11] pvqspinlock, x86: Allow unfair spinlock in a PV guest Waiman Long
2014-03-19 20:14 ` Waiman Long
2014-03-19 20:14 ` [PATCH v7 06/11] pvqspinlock, x86: Allow unfair queue spinlock in a KVM guest Waiman Long
2014-03-19 20:14 ` Waiman Long
2014-03-20 22:01 ` Paolo Bonzini
2014-03-20 22:01 ` Paolo Bonzini
2014-03-20 22:01 ` Paolo Bonzini
2014-03-20 22:29 ` H. Peter Anvin
2014-03-20 22:29 ` H. Peter Anvin
2014-03-20 22:40 ` Paolo Bonzini
2014-03-20 22:40 ` Paolo Bonzini
2014-03-20 22:40 ` Paolo Bonzini
2014-03-20 22:29 ` H. Peter Anvin
2014-03-21 21:27 ` Waiman Long
2014-03-21 21:27 ` Waiman Long
2014-03-19 20:14 ` [PATCH v7 07/11] pvqspinlock, x86: Allow unfair queue spinlock in a XEN guest Waiman Long
2014-03-19 20:14 ` Waiman Long
2014-03-19 20:28 ` Konrad Rzeszutek Wilk
2014-03-19 20:28 ` Konrad Rzeszutek Wilk
2014-03-21 3:40 ` Waiman Long
2014-03-21 3:40 ` Waiman Long
2014-03-21 3:40 ` Waiman Long
2014-03-19 20:28 ` Konrad Rzeszutek Wilk
2014-03-19 20:14 ` [PATCH v7 08/11] pvqspinlock, x86: Rename paravirt_ticketlocks_enabled Waiman Long
2014-03-19 20:14 ` Waiman Long
2014-03-19 20:14 ` [PATCH v7 09/11] pvqspinlock, x86: Add qspinlock para-virtualization support Waiman Long
2014-03-19 20:14 ` Waiman Long
2014-03-19 20:14 ` [PATCH v7 10/11] pvqspinlock, x86: Enable qspinlock PV support for KVM Waiman Long
2014-03-19 20:14 ` Waiman Long
2014-03-20 22:07 ` Paolo Bonzini
2014-03-20 22:07 ` Paolo Bonzini
2014-03-21 21:41 ` Waiman Long
2014-03-21 21:41 ` Waiman Long [this message]
2014-03-20 22:07 ` Paolo Bonzini
2014-03-19 20:14 ` [PATCH RFC v7 11/11] pvqspinlock, x86: Enable qspinlock PV support for XEN Waiman Long
2014-03-19 20:14 ` Waiman Long
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