Re: [PATCH v8 2/6] powerpc: pSeries/Kconfig: Add qspinlock build config
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From: Boqun Feng <hidden>
Date: 2016-12-06 00:59:26
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On Mon, Dec 05, 2016 at 10:19:22AM -0500, Pan Xinhui wrote:
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pSeries/powerNV will use qspinlock from now on. Signed-off-by: Pan Xinhui <redacted> --- arch/powerpc/platforms/pseries/Kconfig | 8 ++++++++ 1 file changed, 8 insertions(+)diff --git a/arch/powerpc/platforms/pseries/Kconfig b/arch/powerpc/platforms/pseries/Kconfig index bec90fb..8a87d06 100644 --- a/arch/powerpc/platforms/pseries/Kconfig +++ b/arch/powerpc/platforms/pseries/Kconfig
Why here? Not arch/powerpc/platforms/Kconfig?
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@@ -23,6 +23,14 @@ config PPC_PSERIES select PPC_DOORBELL default y +config ARCH_USE_QUEUED_SPINLOCKS + default y + bool "Enable qspinlock"
I think you just enable qspinlock by default for all PPC platforms. I guess you need to put depends on PPC_PSERIES || PPC_POWERNV here to achieve what you mean in you commit message. Regards, Boqun
+ 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 PPC_SPLPAR depends on PPC_PSERIES bool "Support for shared-processor logical partitions" -- 2.4.11