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SubjectRe: [PATCH 3/3] x86/mce/therm_throt: allow disabling the thermal vector altogether
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On Tue, 2020-04-07 at 00:33 -0600, Jason A. Donenfeld wrote:
> The thermal IRQ handler uses 1.21% CPU on my system when it's hot
> from
> compiling things. Indeed looking at /proc/interrupts reveals quite a
> lot
I am curious why you are hitting threshold frequently?
What is rdmsr 0x1a2


> of events coming in. Beyond logging them, the existing drivers on the
> system don't appear to do very much that I'm interested in. So, add a
> way to disable this entirely so that I can regain precious CPU
> cycles.
It is showing amount of time system is running in a constrained
environment. Lots of real time and HPC folks really care about this.

Thanks,
Srinivas

>
> Signed-off-by: Jason A. Donenfeld <Jason@zx2c4.com>
> ---
> arch/x86/Kconfig | 4 ++++
> arch/x86/kernel/cpu/mce/intel.c | 3 ++-
> 2 files changed, 6 insertions(+), 1 deletion(-)
>
> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
> index 39e7444353af..3125a11932f2 100644
> --- a/arch/x86/Kconfig
> +++ b/arch/x86/Kconfig
> @@ -1157,7 +1157,11 @@ config X86_MCE_INJECT
>
> config X86_THERMAL_VECTOR
> def_bool y
> + prompt "Machine check thermal vector"
> depends on X86_MCE_INTEL
> + ---help---
> + Provide support for capturing thermal events, logging them,
> and
> + passing them off to other drivers.
>
> config X86_MCE_THERMAL_VERBOSE
> bool "Verbose logging for thermal events"
> diff --git a/arch/x86/kernel/cpu/mce/intel.c
> b/arch/x86/kernel/cpu/mce/intel.c
> index f996ffb887bc..d14f1922fb49 100644
> --- a/arch/x86/kernel/cpu/mce/intel.c
> +++ b/arch/x86/kernel/cpu/mce/intel.c
> @@ -511,7 +511,8 @@ static void intel_ppin_init(struct cpuinfo_x86
> *c)
>
> void mce_intel_feature_init(struct cpuinfo_x86 *c)
> {
> - intel_init_thermal(c);
> + if (IS_ENABLED(CONFIG_X86_THERMAL_VECTOR))
> + intel_init_thermal(c);
> intel_init_cmci();
> intel_init_lmce();
> intel_ppin_init(c);

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