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| author | Stefano Stabellini <stefano.stabellini@eu.citrix.com> | 2015-11-23 10:33:49 +0000 |
|---|---|---|
| committer | David Vrabel <david.vrabel@citrix.com> | 2015-12-21 14:40:54 +0000 |
| commit | dfd57bc3a5664b98eb7b477e8d7bb2591a5198cf (patch) | |
| tree | e44701938f29156839179744ab078b078f11d517 /arch/arm64/Kconfig | |
| parent | 02c2433b3aa6b57313c261c9811bbbe49528101c (diff) | |
| download | lwn-dfd57bc3a5664b98eb7b477e8d7bb2591a5198cf.tar.gz lwn-dfd57bc3a5664b98eb7b477e8d7bb2591a5198cf.zip | |
arm64: introduce CONFIG_PARAVIRT, PARAVIRT_TIME_ACCOUNTING and pv_time_ops
Introduce CONFIG_PARAVIRT and PARAVIRT_TIME_ACCOUNTING on ARM64.
Necessary duplication of paravirt.h and paravirt.c with ARM.
The only paravirt interface supported is pv_time_ops.steal_clock, so no
runtime pvops patching needed.
This allows us to make use of steal_account_process_tick for stolen
ticks accounting.
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Diffstat (limited to 'arch/arm64/Kconfig')
| -rw-r--r-- | arch/arm64/Kconfig | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 871f21783866..987ae39cc471 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -556,6 +556,25 @@ config SECCOMP and the task is only allowed to execute a few safe syscalls defined by each seccomp mode. +config PARAVIRT + bool "Enable paravirtualization code" + help + This changes the kernel so it can modify itself when it is run + under a hypervisor, potentially improving performance significantly + over full virtualization. + +config PARAVIRT_TIME_ACCOUNTING + bool "Paravirtual steal time accounting" + select PARAVIRT + default n + help + Select this option to enable fine granularity task steal time + accounting. Time spent executing other tasks in parallel with + the current vCPU is discounted from the vCPU power. To account for + that, there can be a small performance impact. + + If in doubt, say N here. + config XEN_DOM0 def_bool y depends on XEN @@ -564,6 +583,7 @@ config XEN bool "Xen guest support on ARM64" depends on ARM64 && OF select SWIOTLB_XEN + select PARAVIRT help Say Y if you want to run Linux in a Virtual Machine on Xen on ARM64. |