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authorIngo Molnar <mingo@elte.hu>2009-06-01 10:01:03 +0200
committerIngo Molnar <mingo@elte.hu>2009-06-01 10:01:39 +0200
commit23db9f430be9325a861c7762c1ffadad9ca528a8 (patch)
tree1ebb681611c96f17aa4f96e28d6923824a8b210f /arch/x86/Kconfig
parent27b9613b7be39412775d0ab80f57229aa73bb07d (diff)
parent3218911f839b6c85acbf872ad264ea69aa4d89ad (diff)
Merge branch 'linus' into perfcounters/core
Merge reason: merge almost-rc8 into perfcounters/core, which was -rc6 based - to pick up the latest upstream fixes. Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/Kconfig')
-rw-r--r--arch/x86/Kconfig13
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 32ada97c964..cfd78c87a57 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -498,6 +498,19 @@ 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