[PATCH v9 2/6] powerpc: platforms/Kconfig: Add qspinlock build config
From: Pan Xinhui <hidden>
Date: 2016-12-06 13:13:36
Also in:
lkml, virtualization
Subsystem:
linux for powerpc (32-bit and 64-bit), the rest · Maintainers:
Madhavan Srinivasan, Linus Torvalds
pSeries/powerNV will use qspinlock from now on. Signed-off-by: Pan Xinhui <redacted> --- arch/powerpc/platforms/Kconfig | 9 +++++++++ 1 file changed, 9 insertions(+)
diff --git a/arch/powerpc/platforms/Kconfig b/arch/powerpc/platforms/Kconfig
index fbdae83..3559bbf 100644
--- a/arch/powerpc/platforms/Kconfig
+++ b/arch/powerpc/platforms/Kconfig@@ -20,6 +20,15 @@ source "arch/powerpc/platforms/44x/Kconfig" source "arch/powerpc/platforms/40x/Kconfig" source "arch/powerpc/platforms/amigaone/Kconfig" +config ARCH_USE_QUEUED_SPINLOCKS + depends on PPC_PSERIES || PPC_POWERNV + bool "Enable qspinlock" + default y + help + Enabling this option will let kernel use qspinlock which is a kind of + fairlock. It has shown a good performance improvement on x86 and also + ppc especially in high contention cases. + config KVM_GUEST bool "KVM Guest support" default n
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2.4.11