Commit 4c4e4f61 authored Oct 21, 2013 by Raghavendra K T Committed by Ingo Molnar Oct 26, 2013

x86/locking/kconfig: Update paravirt spinlock Kconfig description

Since the paravirt spinlock optimizations went into the v3.12 kernel
we have a very good performance benefit for paravirtualized KVM / Xen
kernels. Also we no longer suffer from 5% side effect on native
kernel that is mentioned in the Kconfig entry.

So update the Kconfig entry accordingly.

pvspinlock benefit on KVM link:

  https://lkml.org/lkml/2013/8/6/178

Attilio's tests on native kernel impact:

  http://blog.xen.org/index.php/2012/05/11/benchmarking-the-new-pv-ticketlock-implementation/



Signed-off-by: Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>
Cc: <konrad.wilk@oracle.com>
Cc: <linux@eikelenboom.it>
Cc: <gleb@redhat.com>
Cc: <pbonzini@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1382371508-3843-1-git-send-email-raghavendra.kt@linux.vnet.ibm.com


[ Updated the changelog. ]
Signed-off-by: Ingo Molnar <mingo@kernel.org>

parent 1232e380

arch/x86/Kconfig

+3 −3

Original line number	Diff line number	Diff line
		@@ -638,10 +638,10 @@ config PARAVIRT_SPINLOCKS
		spinlock implementation with something virtualization-friendly
		(for example, block the virtual CPU rather than spinning).

		Unfortunately the downside is an up to 5% performance hit on
		native kernels, with various workloads.
		It has a minimal impact on native kernels and gives a nice performance
		benefit on paravirtualized KVM / Xen kernels.

		If you are unsure how to answer this question, answer N.
		If you are unsure how to answer this question, answer Y.

		source "arch/x86/xen/Kconfig"

Admin message