[...]
On 9/21/22 14:13, Yicong Yang wrote:
> +static inline bool arch_tlbbatch_should_defer(struct mm_struct *mm)
> +{
> + /* for small systems with small number of CPUs, TLB shootdown is cheap */
> + if (num_online_cpus() <= 4)
It would be great to have some more inputs from others, whether 4 (which should
to be codified into a macro e.g ARM64_NR_CPU_DEFERRED_TLB, or something similar)
is optimal for an wide range of arm64 platforms.
> + return false;> +
> +#ifdef CONFIG_ARM64_WORKAROUND_REPEAT_TLBI
> + if (unlikely(this_cpu_has_cap(ARM64_WORKAROUND_REPEAT_TLBI)))
> + return false;
> +#endif
> +
> + return true;
> +}
> +
[...]
