linux-kernel - [PATCH v8 2/6] powerpc: pSeries/Kconfig: Add qspinlock build config

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Date:   Mon,  5 Dec 2016 10:19:22 -0500
From:   Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org
Cc:     linuxppc-dev@...ts.ozlabs.org, benh@...nel.crashing.org,
        paulus@...ba.org, mpe@...erman.id.au, peterz@...radead.org,
        mingo@...hat.com, paulmck@...ux.vnet.ibm.com, waiman.long@....com,
        xinhui.pan@...ux.vnet.ibm.com,
        virtualization@...ts.linux-foundation.org, boqun.feng@...il.com
Subject: [PATCH v8 2/6] powerpc: pSeries/Kconfig: Add qspinlock build config

pSeries/powerNV will use qspinlock from now on.

Signed-off-by: Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
---
 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
@@ -23,6 +23,14 @@ config PPC_PSERIES
 	select PPC_DOORBELL
 	default y
 
+config ARCH_USE_QUEUED_SPINLOCKS
+	default y
+	bool "Enable qspinlock"
+	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