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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-05-18 09:17:37 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-05-18 09:17:37 -0700 |
| commit | 13bba6fda98fe03a955665c9d4bf63c8fd9c19c0 (patch) | |
| tree | f0058f8b307eab6da6106cda02b4edd0245977e3 /arch/x86/Kconfig | |
| parent | 0130b2d7010fe8e046b7a6c44911a1d3d0d16c96 (diff) | |
| parent | b4ecc126991b30fe5f9a59dfacda046aeac124b2 (diff) | |
| download | op-kernel-dev-13bba6fda98fe03a955665c9d4bf63c8fd9c19c0.zip op-kernel-dev-13bba6fda98fe03a955665c9d4bf63c8fd9c19c0.tar.gz | |
Merge branch 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
* 'x86-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip:
x86: Fix performance regression caused by paravirt_ops on native kernels
xen: use header for EXPORT_SYMBOL_GPL
x86, 32-bit: fix kernel_trap_sp()
x86: fix percpu_{to,from}_op()
x86: mtrr: Fix high_width computation when phys-addr is >= 44bit
x86: Fix false positive section mismatch warnings in the apic code
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 df9e885..a6efe0a 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 |
