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Date: Thu, 9 Apr 2015 09:01:46 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Waiman Long <Waiman.Long@...com> Cc: Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, linux-arch@...r.kernel.org, x86@...nel.org, linux-kernel@...r.kernel.org, virtualization@...ts.linux-foundation.org, xen-devel@...ts.xenproject.org, kvm@...r.kernel.org, Paolo Bonzini <paolo.bonzini@...il.com>, Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>, Rik van Riel <riel@...hat.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>, David Vrabel <david.vrabel@...rix.com>, Oleg Nesterov <oleg@...hat.com>, Daniel J Blueman <daniel@...ascale.com>, Scott J Norton <scott.norton@...com>, Douglas Hatch <doug.hatch@...com> Subject: Re: [PATCH v15 16/16] unfair qspinlock: a queue based unfair lock 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? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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