linux-kernel - [PATCH v9 2/6] powerpc: platforms/Kconfig: Add qspinlock build config

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Date:   Tue,  6 Dec 2016 13:09:23 -0500
From:   Pan Xinhui <xinhui.pan@...ux.vnet.ibm.com>
To:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Cc:     benh@...nel.crashing.org, paulus@...ba.org, mpe@...erman.id.au,
        peterz@...radead.org, mingo@...hat.com, paulmck@...ux.vnet.ibm.com,
        longman@...hat.com, xinhui.pan@...ux.vnet.ibm.com,
        virtualization@...ts.linux-foundation.org, boqun.feng@...il.com
Subject: [PATCH v9 2/6] powerpc: platforms/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/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
-- 
2.4.11