在 2016/12/6 08:58, Boqun Feng 写道:
On Mon, Dec 05, 2016 at 10:19:22AM -0500, Pan Xinhui wrote:
pSeries/powerNV will use qspinlock from now on.
Signed-off-by: Pan Xinhui <xinhui....@linux.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
Why here? Not arch/powerpc/platforms/Kconfig?
@@ -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
+ 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
