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| author | Ingo Molnar <mingo@elte.hu> | 2009-06-07 11:34:59 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-06-07 11:35:05 +0200 |
| commit | 56fdd18c7b89a2fac1dfe5d54750c9143867fdc4 (patch) | |
| tree | ce48eee7d5960936fa6e385320b7a261a8bee071 /arch/x86/Kconfig | |
| parent | dma-debug: change hash_bucket_find from first-fit to best-fit (diff) | |
| parent | Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/anh... (diff) | |
| download | linux-56fdd18c7b89a2fac1dfe5d54750c9143867fdc4.tar.xz linux-56fdd18c7b89a2fac1dfe5d54750c9143867fdc4.zip | |
Merge branch 'linus' into core/iommu
Merge reason: This branch was on an -rc5 base so pull almost-2.6.30
to resync with the latest upstream fixes and make sure
the combination works fine.
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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 df9e885eee14..a6efe0a2e9ae 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 |