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SubjectRe: [PATCH 4/5] x86/kernel: Provide a means to disable TSC ART
On Mon, Oct 02, 2017 at 10:12:18AM -0500, mike.travis@hpe.com wrote:
> static void detect_art(void)
> {
> unsigned int unused[2];
>
> - if (boot_cpu_data.cpuid_level < ART_CPUID_LEAF)
> + if (boot_cpu_data.cpuid_level < ART_CPUID_LEAF || tsc_art_disabled)
> return;
>
> /* Don't enable ART in a VM, non-stop TSC and TSC_ADJUST required */


So why can't we use is_uv_system() here an for the tsc_adjust thing?

Also (and I hate the name) tsc_multi_sync_resets is the reason you
cannot use ART, I don't think it makes sense to introduce yet another
knob.

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