Re: [PATCH v8 2/6] powerpc: pSeries/Kconfig: Add qspinlock build config

在 2016/12/6 08:58, Boqun Feng 写道:

On Mon, Dec 05, 2016 at 10:19:22AM -0500, Pan Xinhui wrote:

quoted

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?

quoted

@@ -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.

yes, another good way.
I prefer to put it in pseries/Kconfig as same as pv-qspinlocks config.
when we build nv, it still include pSeries's config anyway.

thanks
xinhui

Regards,
Boqun

quoted

+	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

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