From: Peter Zijlstra <peterz@infradead.org>
To: Waiman Long <waiman.long@hp.com>
Cc: Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
linux-arch@vger.kernel.org, x86@kernel.org,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
xen-devel@lists.xenproject.org, kvm@vger.kernel.org,
Paolo Bonzini <paolo.bonzini@gmail.com>,
Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
Boris Ostrovsky <boris.ostrovsky@oracle.com>,
"Paul E. McKenney" <paulmck@linux.vnet.ibm.com>,
Rik van Riel <riel@redhat.com>,
Linus Torvalds <torvalds@linux-foundation.org>,
Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>,
David Vrabel <david.vrabel@citrix.com>,
Oleg Nesterov <oleg@redhat.com>,
Scott J Norton <scott.norton@hp.com>,
Douglas Hatch <doug.hatch@hp.com>
Subject: Re: [PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support
Date: Sat, 25 Oct 2014 00:04:23 +0200 [thread overview]
Message-ID: <20141024220423.GB10501@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <544ABC47.2000700@hp.com>
On Fri, Oct 24, 2014 at 04:53:27PM -0400, Waiman Long wrote:
> The additional register pressure may just cause a few more register moves
> which should be negligible in the overall performance . The additional
> icache pressure, however, may have some impact on performance. I was trying
> to balance the performance of the pv and non-pv versions so that we won't
> penalize the pv code too much for a bit more performance in the non-pv code.
> Doing it your way will add a lot of function call and register
> saving/restoring to the pv code.
If people care about performance they should not be using virt crap :-)
I only really care about bare metal.
next prev parent reply other threads:[~2014-10-24 22:04 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-16 18:10 [PATCH v12 00/11] qspinlock: a 4-byte queue spinlock with PV support Waiman Long
2014-10-16 18:10 ` [PATCH v12 01/11] qspinlock: A simple generic 4-byte queue spinlock Waiman Long
2014-10-16 18:10 ` [PATCH v12 02/11] qspinlock, x86: Enable x86-64 to use " Waiman Long
2014-10-16 18:10 ` [PATCH v12 03/11] qspinlock: Add pending bit Waiman Long
2014-10-16 18:10 ` [PATCH v12 04/11] qspinlock: Extract out code snippets for the next patch Waiman Long
2014-10-16 18:10 ` [PATCH v12 05/11] qspinlock: Optimize for smaller NR_CPUS Waiman Long
2014-10-16 18:10 ` [PATCH v12 06/11] qspinlock: Use a simple write to grab the lock Waiman Long
2014-10-16 18:10 ` [PATCH v12 07/11] qspinlock: Revert to test-and-set on hypervisors Waiman Long
2014-10-16 18:10 ` [PATCH v12 08/11] qspinlock, x86: Rename paravirt_ticketlocks_enabled Waiman Long
2014-10-16 18:10 ` [PATCH v12 09/11] pvqspinlock, x86: Add para-virtualization support Waiman Long
2014-10-24 8:47 ` Peter Zijlstra
2014-10-24 20:53 ` Waiman Long
2014-10-24 22:04 ` Peter Zijlstra [this message]
2014-10-25 4:30 ` Mike Galbraith
2014-10-27 17:15 ` Waiman Long
2014-10-27 17:27 ` Peter Zijlstra
2014-10-27 20:50 ` Waiman Long
2014-10-24 8:54 ` Peter Zijlstra
2014-10-27 17:38 ` Waiman Long
2014-10-27 18:02 ` Konrad Rzeszutek Wilk
2014-10-27 20:55 ` Waiman Long
2014-11-26 0:33 ` Waiman Long
2014-12-01 16:51 ` Konrad Rzeszutek Wilk
2014-10-27 18:04 ` Peter Zijlstra
2014-10-27 21:22 ` Waiman Long
2014-10-29 19:05 ` Waiman Long
2014-10-29 20:25 ` Waiman Long
2014-10-16 18:10 ` [PATCH v12 10/11] pvqspinlock, x86: Enable PV qspinlock for KVM Waiman Long
2014-10-16 18:10 ` [PATCH v12 11/11] pvqspinlock, x86: Enable PV qspinlock for XEN Waiman Long
2014-10-24 8:57 ` [PATCH v12 00/11] qspinlock: a 4-byte queue spinlock with PV support Peter Zijlstra
2014-10-27 18:00 ` Waiman Long
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