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-rw-r--r--arch/x86/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index e03485b..b1d3f60 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -492,6 +492,19 @@ config PARAVIRT
over full virtualization. However, when run without a hypervisor
the kernel is theoretically slower and slightly larger.
+config PARAVIRT_SPINLOCKS
+ bool "Paravirtualization layer for spinlocks"
+ depends on PARAVIRT && SMP && EXPERIMENTAL
+ ---help---
+ Paravirtualized spinlocks allow a pvops backend to replace the
+ spinlock implementation with something virtualization-friendly
+ (for example, block the virtual CPU rather than spinning).
+
+ Unfortunately the downside is an up to 5% performance hit on
+ native kernels, with various workloads.
+
+ If you are unsure how to answer this question, answer N.
+
config PARAVIRT_CLOCK
bool
default n
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