On Wed, Dec 02, 2020 at 10:19:48PM +0100, Enrico Weigelt, metux IT consult wrote:
> Make it possible to opt-out from VMware support, for minimized kernels
> that never will be run under Vmware (eg. high-density virtualization
> or embedded systems).
>
> Average distro kernel will leave it on, therefore default to y.
>
> Signed-off-by: Enrico Weigelt <info@xxxxxxxxx>
> ---
> arch/x86/Kconfig | 11 +++++++++++
> arch/x86/kernel/cpu/Makefile | 4 +++-
> arch/x86/kernel/cpu/hypervisor.c | 2 ++
> drivers/input/mouse/Kconfig | 2 +-
> drivers/misc/Kconfig | 2 +-
> drivers/ptp/Kconfig | 2 +-
> 6 files changed, 19 insertions(+), 4 deletions(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index f6946b81f74a..eff12460cb3c 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -801,6 +801,17 @@ config X86_HV_CALLBACK_VECTOR
>
> source "arch/x86/xen/Kconfig"
>
> +config VMWARE_GUEST
> + bool "VMware Guest support"
> + default y
> + help
> + This option enables several optimizations for running under the
> + VMware hypervisor.
> +
> + Disabling it saves a few kb, for stripped down kernels eg. in high
I was actually expecting for you to do your own measurements and show data.
Anyway, I did it for you:
text data bss dec hex filename
15949304 127806978 36597916 180354198 abffc96 vmlinux.before
15947650 127802430 36602012 180352092 abff45c vmlinux.after
this is with my .config.
How much is it with a stripped down kernel? I bet it is even less. Which
makes this whole effort not worth it...
Also, when you send a new version of your patches, please rework *all*
review feedback you've received on the previous one.
Thx.
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
