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>,
kvm@vger.kernel.org, Daniel J Blueman <daniel@numascale.com>,
x86@kernel.org, Paolo Bonzini <paolo.bonzini@gmail.com>,
linux-kernel@vger.kernel.org,
virtualization@lists.linux-foundation.org,
Scott J Norton <scott.norton@hp.com>,
Ingo Molnar <mingo@redhat.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>,
Douglas Hatch <doug.hatch@hp.com>
Subject: Re: [PATCH v15 16/16] unfair qspinlock: a queue based unfair lock
Date: Thu, 9 Apr 2015 09:01:46 +0200 [thread overview]
Message-ID: <20150409070146.GL27490__212.719609453593$1428563023$gmane$org@worktop.programming.kicks-ass.net> (raw)
In-Reply-To: <1428517939-27968-1-git-send-email-Waiman.Long@hp.com>
On Wed, Apr 08, 2015 at 02:32:19PM -0400, Waiman Long wrote:
> For a virtual guest with the qspinlock patch, a simple unfair byte lock
> will be used if PV spinlock is not configured in or the hypervisor
> isn't either KVM or Xen. The byte lock works fine with small guest
> of just a few vCPUs. On a much larger guest, however, byte lock can
> have serious performance problem.
Who cares?
next prev parent reply other threads:[~2015-04-09 7:01 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-04-08 18:32 [PATCH v15 16/16] unfair qspinlock: a queue based unfair lock Waiman Long
2015-04-08 18:32 ` Waiman Long
2015-04-09 7:01 ` Peter Zijlstra
2015-04-09 13:16 ` Rik van Riel
2015-04-09 13:16 ` Rik van Riel
2015-04-09 13:16 ` Rik van Riel
2015-04-09 14:13 ` Peter Zijlstra
2015-04-09 14:13 ` Peter Zijlstra
2015-04-09 14:13 ` Peter Zijlstra
2015-04-09 14:30 ` Rik van Riel
2015-04-09 14:30 ` Rik van Riel
2015-04-09 14:30 ` Rik van Riel
2015-04-09 21:52 ` Waiman Long
2015-04-09 21:52 ` Waiman Long
2015-04-09 21:52 ` Waiman Long
2015-04-09 7:01 ` Peter Zijlstra [this message]
2015-04-09 7:01 ` Peter Zijlstra
-- strict thread matches above, loose matches on Subject: below --
2015-04-08 18:32 Waiman Long
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