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| author | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-05-29 13:54:52 +1000 |
|---|---|---|
| committer | Benjamin Herrenschmidt <benh@kernel.crashing.org> | 2009-05-29 13:54:52 +1000 |
| commit | 435462c6e639065460e91903d6bd2af0f5762fde (patch) | |
| tree | bf66ccdd613019035ebab535762366aa1026399b /arch/x86/Kconfig | |
| parent | d7b41b1fdf162d3e26cb73bf2cf14816918e371e (diff) | |
| parent | b5c42bc8db17db80917f99205a03c51f17354495 (diff) | |
Merge branch 'merge' into next
Diffstat (limited to 'arch/x86/Kconfig')
| -rw-r--r-- | arch/x86/Kconfig | 13 |
1 files changed, 13 insertions, 0 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index df9e885eee1..a6efe0a2e9a 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 |