From: Peter Zijlstra <peterz@infradead.org>
To: Waiman Long <waiman.long@hp.com>
Cc: linux-arch@vger.kernel.org, Rik van Riel <riel@redhat.com>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
Oleg Nesterov <oleg@redhat.com>, Gleb Natapov <gleb@redhat.com>,
kvm@vger.kernel.org,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Scott J Norton <scott.norton@hp.com>,
x86@kernel.org, Paolo Bonzini <paolo.bonzini@gmail.com>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Ingo Molnar <mingo@redhat.com>, Chegu Vinod <chegu_vinod@hp.com>,
David Vrabel <david.vrabel@citrix.com>,
"H. Peter Anvin" <hpa@zytor.com>,
xen-devel@lists.xenproject.org,
Thomas Gleixner <tglx@linutronix.de>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>
Subject: Re: [PATCH v11 14/16] pvqspinlock: Add qspinlock para-virtualization support
Date: Sun, 15 Jun 2014 15:16:54 +0200 [thread overview]
Message-ID: <20140615131654.GJ11371@laptop.programming.kicks-ass.net> (raw)
In-Reply-To: <539A1229.1050309@hp.com>
On Thu, Jun 12, 2014 at 04:48:41PM -0400, Waiman Long wrote:
> I don't have a good understanding of the kernel alternatives mechanism.
I didn't either; I do now, cost me a whole day reading up on
alternative/paravirt code patching.
See the patches I just send out; I got the 'native' case with paravirt
enabled to be one NOP worse than the native case without paravirt -- for
queue_spin_unlock.
The lock slowpath is several nops and some pointless movs more expensive.
next prev parent reply other threads:[~2014-06-15 13:16 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <1401464642-33890-1-git-send-email-Waiman.Long@hp.com>
2014-05-30 15:43 ` [PATCH v11 01/16] qspinlock: A simple generic 4-byte queue spinlock Waiman Long
2014-05-30 15:43 ` [PATCH v11 02/16] qspinlock, x86: Enable x86-64 to use " Waiman Long
2014-05-30 15:43 ` [PATCH v11 03/16] qspinlock: Add pending bit Waiman Long
2014-05-30 15:43 ` [PATCH v11 04/16] qspinlock: Extract out the exchange of tail code word Waiman Long
2014-05-30 15:43 ` [PATCH v11 05/16] qspinlock: Optimize for smaller NR_CPUS Waiman Long
2014-05-30 15:43 ` [PATCH v11 06/16] qspinlock: prolong the stay in the pending bit path Waiman Long
2014-05-30 15:43 ` [PATCH v11 07/16] qspinlock: Use a simple write to grab the lock, if applicable Waiman Long
2014-05-30 15:43 ` [PATCH v11 08/16] qspinlock: Prepare for unfair lock support Waiman Long
2014-05-30 15:43 ` [PATCH v11 09/16] qspinlock, x86: Allow unfair spinlock in a virtual guest Waiman Long
2014-06-11 10:54 ` Peter Zijlstra
2014-06-11 11:38 ` Peter Zijlstra
2014-06-12 1:37 ` Long, Wai Man
2014-06-12 5:50 ` Peter Zijlstra
2014-06-12 21:08 ` Waiman Long
2014-06-15 13:14 ` Peter Zijlstra
2014-05-30 15:43 ` [PATCH v11 10/16] qspinlock: Split the MCS queuing code into a separate slowerpath Waiman Long
2014-05-30 15:43 ` [PATCH v11 11/16] pvqspinlock, x86: Rename paravirt_ticketlocks_enabled Waiman Long
2014-05-30 15:43 ` [PATCH v11 12/16] pvqspinlock, x86: Add PV data structure & methods Waiman Long
2014-05-30 15:43 ` [PATCH v11 13/16] pvqspinlock: Enable coexistence with the unfair lock Waiman Long
2014-05-30 15:44 ` [PATCH v11 14/16] pvqspinlock: Add qspinlock para-virtualization support Waiman Long
2014-05-30 15:44 ` [PATCH v11 15/16] pvqspinlock, x86: Enable PV qspinlock PV for KVM Waiman Long
2014-05-30 15:44 ` [PATCH v11 16/16] pvqspinlock, x86: Enable PV qspinlock for XEN Waiman Long
[not found] ` <1401464642-33890-7-git-send-email-Waiman.Long@hp.com>
2014-06-11 10:26 ` [PATCH v11 06/16] qspinlock: prolong the stay in the pending bit path Peter Zijlstra
2014-06-11 21:22 ` Long, Wai Man
2014-06-12 6:00 ` Peter Zijlstra
[not found] ` <20140612060032.GQ6758@twins.programming.kicks-ass.net>
2014-06-12 20:54 ` Waiman Long
2014-06-15 13:12 ` Peter Zijlstra
[not found] ` <1401464642-33890-15-git-send-email-Waiman.Long@hp.com>
2014-06-12 8:17 ` [PATCH v11 14/16] pvqspinlock: Add qspinlock para-virtualization support Peter Zijlstra
2014-06-12 20:48 ` Waiman Long
2014-06-15 13:16 ` Peter Zijlstra [this message]
2014-06-17 20:59 ` Konrad Rzeszutek Wilk
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